Battery

Abstract

The invention relates to the technical field of batteries, and particularly discloses a battery. The battery comprises a shell, a cover plate body and a pole group, the pole group penetrates through an opening in one side of the shell and is arranged in the shell, and the cover plate body is packaged at the opening. A mounting hole and a supporting structure are arranged on the cover plate body or the shell, the anti-explosion valve is mounted in the mounting hole, the supporting structure comprises a first boss and a second boss, the first boss and the second boss are arranged towards the pole group, and the first boss is located on the side close to the mounting hole in the first direction. When the battery is subjected to thermal runaway and the insulating part is melted, the pole group can be supported by the supporting structure on the cover plate body or the shell, so that a circulation space is formed between the pole group and the cover plate body / shell, an exhaust passage of the anti-explosion valve is not shielded, the exhaust is smoother, the exhaust efficiency is higher, and the safety of the battery is good.

Description

Technical Field

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

[0002] Lithium-ion batteries have become representatives of high-performance batteries due to their advantages such as high working voltage, high specific energy, large capacity, low self-discharge, good cycle performance, long service life, light weight, and small volume. The structure of a conventional lithium-ion battery includes a cover body, a housing, an electrode group, and an insulating member. After the cover body and the housing are welded, a sealed space for protecting the electrode group is formed. An explosion-proof valve is integrated on the cover body, and the explosion-proof valve can direct the discharge of high-temperature and high-pressure gas in the sealed space when the battery undergoes thermal runaway. The insulating member is arranged in the sealed space formed by the housing and the cover body, and the insulating member is located between the cover body and the electrode group. On the one hand, the electrode group can be supported by the insulating member to prevent the electrode group from shaking in the housing, and the fixing effect is good; on the other hand, the insulating member can prevent the electrode group from short-circuiting with the cover body to ensure the electrical safety of the battery.

[0003] However, the insulating member is generally made of a plastic material (for example, PP material), and its strength and high-temperature resistance are limited, and it will generally melt at about 150°C. When the battery undergoes thermal runaway, the temperature in the sealed space is relatively high, and the insulating member will melt and fail. At this time, only the still solid electrode group remains in the sealed space, the gap between the electrode group and the cover body increases, and due to the lack of the supporting effect of the insulating member on the electrode group, the degree of freedom of the electrode group in the housing is relatively high. When the high-temperature and high-pressure gas is discharged directionally through the explosion-proof valve, the electrode group will move with the high-temperature and high-pressure gas flow, there is a risk of blocking the exhaust passage of the explosion-proof valve, reducing the exhaust efficiency of the explosion-proof valve and having low safety performance. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery, which can avoid the situation that the explosion-proof valve is blocked due to the movement of the electrode group when the battery undergoes thermal runaway, and the explosion-proof valve has a relatively high exhaust efficiency and good safety performance.

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

[0006] The present invention provides a battery, including:

[0007] A housing, which is hollow inside to form a receiving cavity, at least one side of the housing is provided with an opening communicating with the receiving cavity, and the electrode group passes through the opening and is installed in the housing;

[0008] A cover body is encapsulated at the opening and connected to the housing; one of the cover body and the housing is provided with a mounting hole and a support structure. The mounting hole is used for mounting an explosion-proof valve. The support structure includes a first boss and a second boss. Both the first boss and the second boss face the electrode group, and the first boss is located on the side close to the mounting hole along a first direction.

[0009] Wherein, the dimension of the cover body or the housing along the first direction is L, and the sum of the dimensions of all the first bosses and all the second bosses along the first direction is L1;

[0010] L1 and L satisfy: 0.25 ≤ L1 / L ≤ 0.45.

[0011] Optionally, the dimension of the cover body or the housing along a second direction is W, and the sum of the dimensions of all the first bosses and all the second bosses along the second direction is W1;

[0012] W1 and W satisfy: 0.6 ≤ W1 / W ≤ 0.8.

[0013] Optionally, the mounting hole and the support structure are provided on the cover body. There are two groups of the support structures, which are respectively arranged on both sides of the mounting hole along the first direction, and the two groups of support structures are symmetric about the central axis a of the cover body along the second direction.

[0014] Optionally, in each group of the support structures, there is one first boss and two second bosses, and one first boss and two second bosses form a triangular array;

[0015] Wherein, the dimension of the mounting hole along the second direction is A1, the dimension of the first boss along the second direction is A2, and the distance between the mutually adjacent side walls of the two adjacent second bosses along the second direction is A3. A1, A2, and A3 satisfy: A2 < A3 < A1.

[0016] Optionally, in each group of the support structures, the two second bosses are spaced along the second direction, and the two second bosses are symmetric about the central axis b of the cover body along the first direction.

[0017] Optionally, the battery includes an insulating member, which is located on the side of the cover body where the support structure is provided, and the insulating member is clamped between the cover body and the electrode group.

[0018] Optionally, the side of the insulating member facing the cover body is provided with an avoidance groove, and the support structure is accommodated in the avoidance groove.

[0019] Optionally, the first boss and the second boss have equal dimensions in the third direction, and the dimensions of the first boss and the second boss in the third direction are both H;

[0020] The value range of H is: 1.5 mm ≤ H ≤ 2.5 mm.

[0021] Optionally, in a cross-section perpendicular to the third direction, the sum of the cross-sectional areas of all the first bosses and all the second bosses is S1, and the cross-sectional area of the electrode group is S;

[0022] The following relationship is satisfied between S1 and S: 0.3 ≤ S1 / S ≤ 0.45.

[0023] Optionally, the mounting hole and the support structure are provided on the housing, the battery includes an insulating member, the insulating member is located on the side of the housing where the support structure is provided, and the insulating member is clamped between the housing and the electrode group.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention provides a battery, including a housing, a cover body and an electrode group. The electrode group is inserted into the housing through an opening on one side of the housing, and the cover body is sealed at the opening. The cover body or the housing is provided with a mounting hole and a support structure. The explosion-proof valve is installed in the mounting hole. The support structure includes a first boss and a second boss. Both the first boss and the second boss face the electrode group, and the first boss is located on the side close to the mounting hole along the first direction. When the battery undergoes thermal runaway and the insulating member is melted, the electrode group can be supported by the support structure on the cover body or the housing, so as to form a flow space between the electrode group and the cover body, ensure that the exhaust passage of the explosion-proof valve is not blocked, the exhaust is relatively smooth, the exhaust efficiency is high, and the safety of the battery is good.

[0026] In addition, the following relationship is satisfied between the dimension L of the cover body in the first direction and the sum L1 of the dimensions of all the first bosses and all the second bosses in the first direction: 0.25 ≤ L1 / L ≤ 0.45, so that there is sufficient flow space for the high-temperature and high-pressure gas in the second direction, and the support structure can provide good support for the electrode group, avoiding the exhaust passage of the explosion-proof valve being blocked, which is beneficial to ensuring smooth exhaust of the high-temperature and high-pressure gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0028] Figure 1It is a schematic structural diagram of the cover body provided in the first embodiment of the present invention;

[0029] Figure 2 It is a top view of the cover body provided in the first embodiment of the present invention.

[0030] In the figure:

[0031] 100, cover body; 110, mounting hole; 111, limiting step; 120, support structure; 121, first boss; 122, second boss. Detailed implementation manners

[0032] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mount", "connect", "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0036] Embodiment 1

[0037] As Figure 1 and Figure 2 shown, this embodiment provides a battery, which includes a housing, a cover body 100, a battery cell group, and an explosion-proof valve. The interior of the housing is hollow to form a receiving cavity. An opening communicating with the receiving cavity is provided on one side of the housing. The battery cell group passes through the opening and is installed in the housing. The cover body 100 is sealed at the opening and connected to the housing, and the receiving cavity of the housing is closed by the cover body 100. Of course, in other embodiments, openings communicating with the receiving cavity may also be provided on both opposite sides of the housing. At this time, two cover bodies 100 are also correspondingly provided, and each cover body 100 is used to block one opening of the housing. The cover body 100 is provided with a mounting hole 110 and a support structure 120. The explosion-proof valve is installed in the mounting hole 110. The support structure 120 includes a first boss 121 and a second boss 122. Both the first boss 121 and the second boss 122 face the battery cell group, and the first boss 121 is located on the side close to the mounting hole 110 along a first direction. Herein, the first direction refers to the length direction of the cover body 100, that is, Figure 1 the X-axis direction shown in

[0038] the X-axis direction shown in the figure. Optionally, the first boss 121 and the second boss 122 can be formed by stamping on the cover body 100 using a jig.

[0039] Further, in this embodiment, the dimension of the cover body 100 in the first direction is L, and the sum of the dimensions of all the first bosses 121 and all the second bosses 122 in the first direction is L1. The relationship between L1 and L satisfies: 0.25 ≤ L1 / L ≤ 0.45. For example, the value of L1 / L can be 0.25, 0.30, 0.40, or 0.45. By controlling the value of L1 / L within the above range, there is sufficient flow space for the high-temperature and high-pressure gas in the housing in the second direction, and at the same time, it is ensured that the support structure 120 can provide a good support effect for the electrode group, avoiding the exhaust passage of the explosion-proof valve being blocked. Herein, the second direction refers to the width direction of the cover body 100, that is, Figure 1 the Y-axis direction shown in

[0040] Optionally, the value range of L is 80 mm ≤ L ≤ 120 mm. For example, the value of L can be 80 mm, 90 mm, 100 mm, 110 mm, or 120 mm, etc.

[0041] Continuing to refer to Figure 1 , in some embodiments, a limiting step 111 is provided on the inner wall of the mounting hole 110. The explosion-proof valve is inserted into the mounting hole 110 from the side of the cover body 100 close to the insulating member. The circumferential edge of the explosion-proof valve overlaps on the limiting step 111, and the circumferential edge of the explosion-proof valve is welded to the cover body 100 to realize the installation and fixation of the explosion-proof valve on the cover body 100. When the pressure in the accommodating cavity of the housing exceeds the opening pressure of the explosion-proof valve, the explosion-proof valve is opened, and an exhaust passage for the high-temperature and high-pressure gas to flow through is formed on the explosion-proof valve, thereby realizing pressure relief and ensuring the safety of the battery.

[0042] Continuing to refer to Figure 2 , in this embodiment, the dimension of the cover body 100 in the second direction is W, and the sum of the dimensions of all the first bosses 121 and all the second bosses 122 in the second direction is W1. The relationship between W1 and W satisfies: 0.6 ≤ W1 / W ≤ 0.8. For example, the value of W1 / W can be 0.6, 0.7, or 0.8. By controlling the value of W1 / W within the above range, there is sufficient flow space for the high-temperature and high-pressure gas in the housing in the first direction, and at the same time, it is ensured that the support structure 120 can provide a good support effect for the electrode group, avoiding the exhaust passage of the explosion-proof valve being blocked. Otherwise, when the value of W1 / W is too small, the support structure 120 has a poor support effect on the electrode group, and there is a situation where the exhaust passage of the explosion-proof valve is blocked; when the value of W1 / W is too large, the flow space for the high-temperature and high-pressure gas in the first direction is insufficient, affecting the exhaust effect and resulting in low exhaust efficiency.

[0043] Optionally, the value range of W is 20 mm ≤ W ≤ 40 mm. For example, the value of W can be 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, etc.

[0044] As an alternative solution, in this embodiment, there are two sets of support structures 120 on the cover body 100. The two sets of support structures 120 are respectively arranged on both sides of the mounting hole 110 along the first direction, and the two sets of support structures 120 are symmetric about the central axis a of the cover body 100 along the second direction. By providing two sets of support structures 120, both ends of the cover body 100 along the first direction can provide more uniform supporting force for the electrode group, and the supporting effect on the electrode group is good. Furthermore, relatively large flow spaces are formed on both sides of the mounting hole 110 along the first direction, ensuring that high-temperature and high-pressure gas can pass through quickly, the exhaust efficiency of the explosion-proof valve is high, and the risk of explosion is avoided.

[0045] Continue to refer to Figure 2 , in each set of support structures 120 of this embodiment, there is one first boss 121 and two second bosses 122. The two second bosses 122 are arranged at intervals along the second direction, and the two second bosses 122 are symmetric about the central axis b of the cover body 100 along the first direction, that is to say, the ends of the two second bosses 122 along the first direction are flush. When adopting this design scheme, on the one hand, the structure of the cover body 100 is relatively regular, which is convenient for processing and manufacturing; on the other hand, the support structure 120 on the cover body 100 provides relatively uniform supporting force for the electrode group along the second direction, ensuring that the electrode group has a good shape in the housing, not blocking the exhaust passage of the explosion-proof valve, with smooth exhaust and high safety of the battery.

[0046] And one first boss 121 and two second bosses 122 in each set of support structures 120 form a triangular array. Among them, the dimension of the first boss 121 along the first direction is B1, the dimension of the second boss 122 along the first direction is B2, and the sum L1 of the dimensions of all first bosses 121 and all second bosses 122 along the first direction is: L1 = 2 * B1 + 2 * B2. The dimension of the first boss 121 along the second direction is A2, the dimension of the second boss 122 along the second direction is A4, and the sum W1 of the dimensions of all first bosses 121 and all second bosses 122 along the second direction is: W1 = A2 + 2 * A4.

[0047] Furthermore, the dimension of the mounting hole 110 along the second direction is A1, and the distance between the mutually adjacent side walls of two adjacent second bosses 122 is A3. The relationship among A1, A2, and A3 satisfies: A2 < A3 < A1. By making the values of A1, A2, and A3 satisfy the above relationship, it can be ensured that the flow of high-temperature and high-pressure gas along the first direction is not blocked by the support structure 120, ensuring smooth exhaust.

[0048] Exemplarily, the value range of A1 is 10mm≤A1≤16mm. The value range of A2 is 7mm≤A2≤9mm. The value range of A3 is 8mm≤A3≤10mm. For example, in some embodiments, the value of A1 is 10mm, the value of A2 is 7mm, and the value of A3 is 8mm. Of course, in other embodiments, the specific values ​​of A1, A2, and A3 may also be other values ​​that satisfy the above relationship, which are not listed here one by one.

[0049] Continue to see Figure 1 In this embodiment, the first boss 121 and the second boss 122 have the same size along the third direction. The size of the first boss 121 and the second boss 122 along the third direction is H, and the value range of H is: 1.5mm≤H≤2.5mm. The third direction is the height direction of the cover body 100, that is, Figure 1 The Z-axis direction shown in . Exemplarily, the value of H can be 1.5 mm, 2.0 mm, 2.5 mm, etc. By limiting the size H of the first boss 121 and the second boss 122 along the third direction within the above range, it can be ensured that the flow space between the cover body 100 and the pole group is large, the exhaust requirements are met, and the high-temperature and high-pressure gas is exhausted smoothly.

[0050] Furthermore, in a cross section perpendicular to the third direction, that is, parallel to Figure 1 In the cross section of the XY plane, the sum of the cross-sectional areas of all the first bosses 121 and all the second bosses 122 is S1, the cross-sectional area of ​​the pole group is S, and S1 and S satisfy: 0.3≤S1 / S≤0.45. Exemplarily, the value of S1 / S can be 0.3, 0.35, 0.4 or 0.45, etc. By controlling the value of S1 / S within the above range, the contact area between the support structure 120 and the pole group is larger, the first boss 121 and the second boss 122 have a better support effect on the pole group, and at the same time, the circulation space formed between the cover body 100 and the pole group is larger, which meets the circulation needs of high-temperature and high-pressure gas.

[0051] Optionally, the value range of S1 is 900mm 2 ≤S1≤3600mm 2 , the value range of S is 3000mm 2 ≤S≤8000mm 2 For example, when the value of S is 3000mm 2 When S1 is 900 mm 2 、1050mm 2 、1200mm 2 , or 1350mm 2 When the value of S is 5000mm 2 When S1 is 1500 mm2 , 1750 mm 2 , 2000 mm 2 , or 2250 mm 2 etc. When the value of S is 8000 mm 2 , the value of S1 can be 2400 mm 2 , 2800 mm 2 , 3200 mm 2 or 3600 mm 2 etc.

[0052] More preferably, in some embodiments, a relief groove is provided on one side of the insulating member facing the cover body 100, and the support structure 120 can be received in the relief groove, so as to prevent interference between the insulating member and the support structure 120 on the cover body 100 and ensure good assembly between the two. At the same time, by providing the relief groove, the overall dimension of the cover body 100 and the insulating member in the third direction after assembly can be reduced, thereby increasing the layout space of the electrode group in the battery case and being beneficial to improving the energy density of the battery.

[0053] Optionally, the relief groove on the insulating member can be provided as one, and all the first bosses 121 and the second bosses 122 are located in the same relief groove. Alternatively, in other embodiments, the relief groove can also be provided as multiple, and each first boss 121 and each second boss 122 are respectively arranged in a separate relief groove. At this time, the relief groove can also play a certain limiting effect on the cover body 100, and the positioning effect between the cover body and the insulating member is good.

[0054] Next, the thermal runaway verification of the battery with the above structure is carried out on some samples with different design dimensions, and the effects of the parameters L1 / L, W1 / W, A1, A2 and A3 on the battery safety performance are investigated. The results are shown in Table 1.

[0055] Table 1

[0056]

[0057] From the above results, it can be obtained that in Sample 1, the value of L1 / L is less than the minimum value of 0.25 ≤ L1 / L ≤ 0.45, the value of W1 / W satisfies its corresponding value range, and A2 < A3 < A1. At this time, the total length of the first boss 121 and the second boss 122 in the first direction is relatively short, the support effect on the electrode group is not obvious, the exhaust of the explosion-proof valve is not smooth, and the passing rate of the battery thermal runaway test is relatively low, only 20%, and the battery is defective.

[0058] In sample 2, the value of W1 / W is less than the minimum value of 0.6≤W1 / W≤0.8, the value of L1 / L satisfies its corresponding value range, and A2<A3<A1. At this time, the total length of the first boss 121 and the second boss 122 along the second direction is short, the supporting effect on the electrode group is not obvious, the explosion-proof valve is not vented smoothly, and the pass rate of the battery thermal runaway test is low, only 60%, and the battery is defective.

[0059] In samples 3 to 9, the values ​​of L1 / L and W1 / W all satisfy their corresponding value ranges, and A2<A3<A1. At this time, the first boss 121 and the second boss 122 have obvious supporting effects on the electrode group, and the flow space formed between the cover body 100 and the electrode group is large. The explosion-proof valve exhausts smoothly, the exhaust efficiency is high, the pass rate of the battery thermal runaway test is as high as 100%, and the battery is in good condition.

[0060] In samples 10 to 13, the values ​​of L1 / L and W1 / W all satisfy their corresponding value ranges, but the values ​​of A1, A2 and A3 cannot satisfy A2<A3<A1. At this time, the flow path of high-temperature and high-pressure gas along the first direction is blocked, the explosion-proof valve cannot vent smoothly, and the pass rate of the battery thermal runaway test is reduced. The pass rate of the battery thermal runaway test is low, about 20%-60%, and the battery is defective.

[0061] The thermal runaway of the battery with the above structure is verified by using samples of different design sizes to examine the influence of parameters S1, S and S1 / S on the battery safety performance. The results are shown in Table 2.

[0062] Table 2

[0063]

[0064] From the above results, it can be concluded that in samples 14 to 24, the value of S1 / S satisfies its corresponding value range. At this time, the first boss 121 and the second boss 122 have obvious supporting effects on the electrode group, the explosion-proof valve exhausts smoothly, the pass rate of the battery thermal runaway test is as high as 100%, and the battery is in good condition.

[0065] In samples 25 and 26, the value of S1 / S is less than the minimum value of 0.3≤S1 / S≤0.45. At this time, the contact area between the first boss 121 and the second boss 122 and the electrode group is insufficient, the supporting effect on the electrode group is not obvious, the explosion-proof valve is not vented smoothly, the pass rate of the battery thermal runaway test is low, and the battery is defective.

[0066] In samples 27 and 28, the value of S1 / S is greater than the maximum value of 0.3 ≤ S1 / S ≤ 0.45. At this time, the first boss 121 and the second boss 122 obstruct the flow of high-temperature and high-pressure gas. The flow space of the high-temperature and high-pressure gas along the first direction is insufficient, resulting in a shielding problem for the explosion-proof valve. The explosion-proof valve has poor exhaust, low exhaust efficiency, a low passing rate of the battery thermal runaway test, and the battery is defective.

[0067] In summary, it can be seen that the size design and position arrangement of the first boss 121 and the second boss 122 have a great influence on the support effect of the electrode group and the exhaust effect of the explosion-proof valve. When the size design defined in this embodiment is adopted, it can ensure that the support structure 120 has a good support effect on the electrode group. At the same time, the exhaust of the explosion-proof valve is not affected, greatly improving the passing rate of the battery thermal runaway test and the high safety performance of the battery.

[0068] Embodiment 2

[0069] This embodiment provides a battery, which is different from the battery in Embodiment 1 in that: in this embodiment, the mounting holes 110 and the support structure 120 are arranged on the housing, and the insulating member is located on the side of the housing where the support structure 120 is provided, and the insulating member is clamped between the housing and the electrode group. When the battery undergoes thermal runaway, since the temperature inside the housing rises sharply and far exceeds the melting point of the insulating member, the insulating member melts into a liquid state and flows together with the electrolyte. At this time, the support structure 120 on the housing can support the electrode group to form a flow space between the electrode group and the housing, thereby ensuring that the exhaust passage of the explosion-proof valve is not blocked, the exhaust is relatively smooth, the exhaust efficiency is relatively high, and the safety of the battery is good.

[0070] Optionally, the support structure 120 includes a first boss 121 and a second boss 122, and the first boss 121 and the second boss 122 can be formed by stamping on the housing using a jig.

[0071] The remaining structures of the battery in this embodiment are the same as those in Embodiment 1 and will not be described in detail here.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery, characterized in that: include: A shell, the interior of which is hollow to form a receiving cavity, at least one side of the shell is provided with an opening communicating with the receiving cavity, and the pole group is inserted into the shell through the opening; A cover body is encapsulated at the opening and connected to the shell; one of the cover body and the shell is provided with a mounting hole and a support structure, the mounting hole is used to install the explosion-proof valve, and the support structure includes a first boss and a second boss, the first boss and the second boss are both arranged toward the pole group, and the first boss is located at a side close to the mounting hole along the first direction; The size of the cover body or the shell along the first direction is L, and the sum of the sizes of all the first bosses and all the second bosses along the first direction is L1; L1 and L satisfy the following condition: 0.25≤L1 / L≤0.

45.

2. The battery according to claim 1, characterized in that The dimension of the cover body or the shell along the second direction is W, the sum of the dimensions of all the first bosses and all the second bosses along the second direction is W1, and W1 and W satisfy the following: 0.6≤W1 / W≤0.

8.

3. The battery according to claim 1, characterized in that The mounting hole and the support structure are arranged on the cover body, and the support structure is provided with two groups, which are respectively arranged on both sides of the mounting hole along the first direction, and the two groups of support structures are symmetrical about the central axis a of the cover body along the second direction.

4. The battery according to claim 3, characterized in that In each group of the supporting structures, one first boss is provided, two second bosses are provided, and one first boss and two second bosses are arranged in a triangular array; Among them, the size of the mounting hole along the second direction is A1, the size of the first boss along the second direction is A2, the distance between the side walls of two adjacent second bosses along the second direction is A3, and A1, A2, and A3 satisfy: A2<A3<A1.

5. The battery according to claim 4, characterized in that In each group of the supporting structures, two second bosses are spaced apart along the second direction, and the two second bosses are symmetrical about the central axis b of the cover body along the first direction.

6. The battery according to claim 3, characterized in that The battery comprises an insulating member, the insulating member is located at a side of the cover body where the supporting structure is provided, and the insulating member is sandwiched between the cover body and the electrode group.

7. The battery according to claim 6, characterized in that A side of the insulating member facing the cover body is provided with an avoidance groove, and the supporting structure is accommodated in the avoidance groove.

8. The battery according to claim 1, characterized in that The sizes of the first boss and the second boss along the third direction are equal, and the sizes of the first boss and the second boss along the third direction are both H, and the value range of H is: 1.5mm≤H≤2.5mm.

9. The battery according to claim 1, characterized in that In a cross section perpendicular to the third direction, the sum of the cross-sectional areas of all the first bosses and all the second bosses is S1, the cross-sectional area of ​​the pole group is S, and S1 and S satisfy: 0.3≤S1 / S≤0.

45.

10. The battery according to claim 1, characterized in that The mounting hole and the supporting structure are arranged on the shell, and the battery comprises an insulating member, which is located at a side of the shell where the supporting structure is arranged, and the insulating member is sandwiched between the shell and the pole group.

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