A type of battery

Abstract

This invention relates to the field of battery technology, specifically disclosing a battery. The battery includes a casing, a cover plate body, and electrode assemblies. The electrode assemblies are inserted into the casing through an opening on one side, and the cover plate body is sealed at the opening. The cover plate body or casing has mounting holes and a support structure. An explosion-proof valve is installed in the mounting holes. The support structure includes a first boss and a second boss, both facing the electrode assemblies. Along a first direction, the first boss is located on the side closest to the mounting holes. When the battery experiences thermal runaway and the insulating components melt, the support structure on the cover plate body or casing can support the electrode assemblies, creating a flow space between the electrode assemblies and the cover plate body / casing. This ensures that the venting channel of the explosion-proof valve is not blocked, resulting in smoother venting, higher venting efficiency, and better battery safety.

Description

Technical Field

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

[0002] Lithium-ion batteries have become representative of high-performance batteries due to their advantages such as high operating voltage, high specific energy, large capacity, low self-discharge, good cycle performance, long service life, light weight, and small size. The structure of a conventional lithium-ion battery includes a cover plate, a casing, electrode assembly, and insulating components. The cover plate and casing are welded together to form a sealed space protecting the electrode assembly. An explosion-proof valve is integrated into the cover plate, which can directionally discharge high-temperature, high-pressure gas from the sealed space in the event of thermal runaway. The insulating components are located within the sealed space formed by the casing and cover plate, and are positioned between the cover plate and the electrode assembly. On one hand, the insulating components support the electrode assembly, preventing it from wobbling within the casing, thus providing good fixation; on the other hand, the insulating components prevent short circuits between the electrode assembly and the cover plate, ensuring the electrical safety of the battery.

[0003] However, insulating components are generally made of plastic materials (such as PP), which have limited strength and high-temperature resistance, and typically melt at around 150°C. When a battery experiences thermal runaway, the temperature inside the sealed space is high, causing the insulating components to melt and fail. At this point, only the still-solid electrode assembly remains in the sealed space. The gap between the electrode assembly and the cover plate increases, and due to the lack of support from the insulating components, the electrode assembly has a high degree of freedom within the casing. When high-temperature, high-pressure gas is vented through the explosion-proof valve, the electrode assembly will move with the high-temperature, high-pressure gas flow, posing a risk of blocking the explosion-proof valve's venting passage, reducing the valve's venting efficiency, and resulting in low safety performance. Summary of the Invention

[0004] The purpose of this invention is to provide a battery that can prevent the explosion-proof valve from being blocked due to the movement of the electrode assembly when the battery experiences thermal runaway. The explosion-proof valve has high venting efficiency and good safety performance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a battery, comprising:

[0007] The housing has a hollow interior forming a receiving cavity, and at least one side of the housing has an opening communicating with the receiving cavity. The electrode assembly passes through the opening and is installed into the housing.

[0008] A cover plate body is encapsulated at the opening and connected to the housing; one of the cover plate body and the housing is provided with a mounting hole and a support structure, the mounting hole is used to install an explosion-proof valve, and the support structure includes a first boss and a second boss, both of which are oriented toward the pole group, and the first boss is located on the side close to the mounting hole along the first direction;

[0009] Wherein, the dimension of the cover plate body or the shell 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] The condition L1 and L satisfy: 0.25≤L1 / L≤0.45.

[0011] Optionally, the dimension of the cover plate body or the housing along the 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] The condition W1 and W satisfy: 0.6 ≤ W1 / W ≤ 0.8.

[0013] Optionally, the mounting hole and the support structure are provided on the cover plate body. The support structure is provided in two sets, and the two sets of support structures are respectively arranged on both sides of the mounting hole along the first direction. The two sets of support structures are symmetrical about the central axis a of the cover plate body along the second direction.

[0014] Optionally, in each set of the support structure, there is one first boss and two second bosses, with one first boss and two second bosses arranged in 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, the distance between the sidewalls of two adjacent second bosses along the second direction is A3, and A1, A2, and A3 satisfy: A2 < A3 < A1.

[0016] Optionally, in each set of the support structure, two second protrusions are spaced apart along the second direction, and the two second protrusions are symmetrical about the central axis b of the cover plate body along the first direction.

[0017] Optionally, the battery includes an insulating element located on the side of the cover plate body where the support structure is provided, and the insulating element is sandwiched between the cover plate body and the electrode assembly.

[0018] Optionally, the insulating element has a clearance groove on the side facing the cover plate body, and the support structure is accommodated in the clearance groove.

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

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

[0021] Optionally, along 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 pole group is S;

[0022] The condition S1 and S satisfy: 0.3≤S1 / S≤0.45.

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

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

[0025] This invention provides a battery comprising a casing, a cover plate body, and an electrode assembly. The electrode assembly is inserted into the casing through an opening on one side, and the cover plate body is sealed at the opening. The cover plate body or casing has mounting holes and a support structure. An explosion-proof valve is installed in the mounting holes. The support structure includes a first boss and a second boss, both facing the electrode assembly. Along a first direction, the first boss is located on the side closest to the mounting hole. When the battery experiences thermal runaway and the insulating components melt, the support structure on the cover plate body or casing can support the electrode assembly, creating a flow space between the electrode assembly and the cover plate body. This ensures that the venting channel of the explosion-proof valve is not blocked, resulting in smoother venting, higher venting efficiency, and better battery safety.

[0026] In addition, the dimension L of the cover plate body along the first direction and the sum of the dimensions L1 of all the first bosses and all the second bosses along the first direction satisfy the condition: 0.25≤L1 / L≤0.45, which ensures sufficient flow space for high-temperature and high-pressure gas along the second direction, and the support structure can provide good support for the electrode assembly, preventing the exhaust channel of the explosion-proof valve from being blocked, which is conducive to ensuring smooth exhaust of high-temperature and high-pressure gas. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0028] Figure 1This is a schematic diagram of the structure of the cover plate body provided in Embodiment 1 of the present invention;

[0029] Figure 2 This is a top view of the cover plate body provided in Embodiment 1 of the present invention.

[0030] In the picture:

[0031] 100. Cover plate body; 110. Mounting hole; 111. Limiting step; 120. Support structure; 121. First boss; 122. Second boss. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same 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 limiting the present invention.

[0036] Example 1

[0037] like Figure 1 and Figure 2 As shown, this embodiment provides a battery including a casing, a cover body 100, an electrode assembly, and an explosion-proof valve. The casing is hollow, forming a receiving cavity. One side of the casing has an opening communicating with the receiving cavity. The electrode assembly passes through the opening and is inserted into the casing. The cover body 100 is sealed at the opening and connected to the casing, thus sealing the receiving cavity of the casing. Alternatively, in other embodiments, openings communicating with the receiving cavity can be provided on opposite sides of the casing. In this case, two cover bodies 100 are correspondingly provided, each used to seal one opening of the casing. The cover body 100 has 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 facing the electrode assembly. Along a first direction, the first boss 121 is located on the side closest to the mounting hole 110. The first direction refers to the length direction of the cover body 100, i.e. Figure 1 The X-axis direction is shown in the figure. Optionally, the first boss 121 and the second boss 122 can be stamped on the cover plate body 100 using a jig.

[0038] The battery also includes an insulating component located on the side of the cover body 100 where the support structure 120 is provided. The insulating component is sandwiched between the cover body 100 and the electrode assembly, serving to support the electrode assembly, prevent it from shaking within the casing, and insulate the electrode assembly from the cover body 100. When the battery experiences thermal runaway, the temperature inside the casing rises rapidly and far exceeds the melting point of the insulating component. The insulating component melts into a liquid state and flows along with the electrolyte. At this time, the support structure 120 on the cover body 100 can support the electrode assembly, creating a flow space between the electrode assembly and the cover body 100. This ensures that the venting channel of the explosion-proof valve is not blocked, resulting in smoother venting, higher venting efficiency, and better battery safety.

[0039] Furthermore, in this embodiment, the dimension of the cover plate body 100 along the first direction is L, and the sum of the dimensions of all first protrusions 121 and all second protrusions 122 along the first direction is L1. L1 and L satisfy the condition: 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, sufficient space is provided for the flow of high-temperature, high-pressure gas within the housing along the second direction, while also ensuring that the support structure 120 provides good support for the electrode assembly, preventing the exhaust channel of the explosion-proof valve from being blocked. Here, the second direction refers to the width direction of the cover plate body 100, i.e. Figure 1 The Y-axis direction is shown in the figure. Otherwise, when the value of L1 / L is too small, the support structure 120 for the pole group will not provide good support, and the exhaust channel of the explosion-proof valve may be blocked; when the value of L1 / L is too large, the flow space of high-temperature and high-pressure gas along the second direction will be insufficient, affecting the exhaust effect and resulting in low exhaust efficiency.

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

[0041] See also 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 plate body 100 near the insulating component. The circumferential edge of the explosion-proof valve overlaps the limiting step 111, and the circumferential edge of the explosion-proof valve is welded to the cover plate body 100 to achieve the installation and fixation of the explosion-proof valve on the cover plate 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 forced open, forming an exhaust channel for high-temperature and high-pressure gas to flow through the explosion-proof valve, thereby achieving pressure relief and ensuring battery safety.

[0042] See also Figure 2 In this embodiment, the dimension of the cover plate body 100 along the second direction is W, and the sum of the dimensions of all first protrusions 121 and all second protrusions 122 along the second direction is W1. W1 and W satisfy the condition: 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, sufficient space is provided for the flow of high-temperature, high-pressure gas in the housing along the first direction, while also ensuring that the support structure 120 provides good support for the electrode assembly, preventing the exhaust channel of the explosion-proof valve from being blocked. Otherwise, if the value of W1 / W is too small, the support structure 120 will not provide good support for the electrode assembly, and the exhaust channel of the explosion-proof valve may be blocked; if the value of W1 / W is too large, the flow space of high-temperature, high-pressure gas along the first direction will be insufficient, affecting the exhaust effect and resulting in low exhaust efficiency.

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

[0044] As an optional solution, in this embodiment, the cover plate body 100 has two sets of support structures 120, which are respectively arranged on both sides of the mounting hole 110 along the first direction. The two sets of support structures 120 are symmetrical about the central axis a of the cover plate body 100 along the second direction. By setting two sets of support structures 120, the two ends of the cover plate body 100 along the first direction can provide more uniform support force to the electrode group, resulting in good support for the electrode group. This also creates a large flow space on both sides of the mounting hole 110 along the first direction, ensuring rapid passage of high-temperature and high-pressure gas, high exhaust efficiency of the explosion-proof valve, and avoiding the risk of explosion.

[0045] See also Figure 2 In this embodiment, each set of support structures 120 includes one first protrusion 121 and two second protrusions 122. The two second protrusions 122 are spaced apart along the second direction and are symmetrical about the central axis b of the cover body 100 along the first direction. That is, the ends of the two second protrusions 122 along the first direction are flush. With this design, 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 support for the electrode assembly along the second direction, ensuring that the electrode assembly has a good shape inside the casing, does not block the exhaust channel of the explosion-proof valve, has smooth exhaust, and high battery safety.

[0046] Furthermore, in each set of support structures 120, one first protrusion 121 and two second protrusions 122 are arranged in a triangular array. The dimension of the first protrusion 121 along the first direction is B1, and the dimension of the second protrusion 122 along the first direction is B2. The sum of the dimensions of all first protrusions 121 and all second protrusions 122 along the first direction, L1, is: L1 = 2 * B1 + 2 * B2. The dimension of the first protrusion 121 along the second direction is A2, and the dimension of the second protrusion 122 along the second direction is A4. The sum of the dimensions of all first protrusions 121 and all second protrusions 122 along the second direction, W1, 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 adjacent sidewalls of two second protrusions 122 is A3. A1, A2, and A3 satisfy the following relationship: A2 < A3 < A1. By ensuring that the values ​​of A1, A2, and A3 satisfy the above relationship, it can be guaranteed that the flow of high-temperature and high-pressure gas along the first direction is not blocked by the support structure 120, thus ensuring smooth exhaust.

[0048] For example, 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 instance, 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 can also be other values ​​that satisfy the above relationships, which will not be listed here.

[0049] See also Figure 1 In this embodiment, the dimensions of the first boss 121 and the second boss 122 along the third direction are equal. The dimension of both the first boss 121 and the second boss 122 along the third direction is H, and the value of H ranges from 1.5mm to H and from 2.5mm to H. The third direction refers to the height direction of the cover plate body 100, that is... Figure 1 The Z-axis direction is shown in the figure. For example, the value of H can be 1.5mm, 2.0mm, 2.5mm, etc. By limiting the dimensions H of the first boss 121 and the second boss 122 along the third direction to the above range, it can be ensured that the flow space between the cover plate body 100 and the electrode group is large, which meets the exhaust requirements and ensures smooth exhaust of high temperature and high pressure gas.

[0050] Furthermore, along the section perpendicular to the third direction, that is, parallel to... Figure 1 Within the cross-section of the XY plane, the sum of the cross-sectional areas of all first protrusions 121 and all second protrusions 122 is S1, and the cross-sectional area of ​​the pole group is S. S1 and S satisfy the condition: 0.3 ≤ S1 / S ≤ 0.45. For example, 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 support effect of the first protrusions 121 and second protrusions 122 on the pole group is better, and the flow space formed between the cover plate body 100 and the pole group is larger, meeting the flow requirements of high-temperature and high-pressure gas.

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

[0052] More preferably, in some embodiments, a clearance groove is provided on the side of the insulating component facing the cover plate body 100, and the support structure 120 can be accommodated in the clearance groove, thereby avoiding interference between the insulating component and the support structure 120 on the cover plate body 100 and ensuring good assembly between the two. At the same time, by setting the clearance groove, the overall dimension of the cover plate body 100 and the insulating component after assembly along a third direction can be reduced, thereby increasing the arrangement space of the electrode assembly inside the housing, which is beneficial to improving the energy density of the battery.

[0053] Optionally, the insulating component can be provided with one clearance groove, in which all the first protrusions 121 and second protrusions 122 are located within the same clearance groove. Alternatively, in other embodiments, multiple clearance grooves can be provided, with each first protrusion 121 and each second protrusion 122 correspondingly disposed within a separate clearance groove. In this case, the clearance groove can also provide a certain limiting effect on the cover plate body 100, resulting in good positioning between the cover plate body and the insulating component.

[0054] The thermal runaway of the battery structure described above was verified using samples of different design sizes. The effects of parameters L1 / L, W1 / W, A1, A2 and A3 on the battery safety performance were investigated. The results are shown in Table 1.

[0055] Table 1

[0056]

[0057] From the above results, it can be concluded 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 meets its corresponding range, and A2<A3<A1. At this time, the total length of the first protrusion 121 and the second protrusion 122 along the first direction is short, the support effect on the electrode group is not obvious, the explosion-proof valve exhaust is not smooth, the pass rate of the battery thermal runaway test is 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 meets its corresponding range, and A2<A3<A1. At this time, the total length of the first protrusion 121 and the second protrusion 122 along the second direction is short, the support effect on the electrode group is not obvious, the explosion-proof valve exhaust is not smooth, 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 both meet their corresponding ranges, and A2 < A3 < A1. At this time, the first protrusion 121 and the second protrusion 122 provide significant support to the electrode group, the flow space formed between the cover plate 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 both meet their corresponding ranges, but the values ​​of A1, A2, and A3 do not meet the condition A2 < A3 < A1. At this time, the flow path of the high-temperature and high-pressure gas along the first direction is blocked, the explosion-proof valve exhaust is not smooth, the pass rate of the battery thermal runaway test is reduced, and the pass rate of the battery thermal runaway test is low, about 20%-60%, indicating that the battery is defective.

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

[0062] Table 2

[0063]

[0064] The results above show that in samples 14 to 24, the value of S1 / S meets the corresponding range. At this time, the first protrusion 121 and the second protrusion 122 have a significant supporting effect 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 protrusion 121 and the second protrusion 122 and the electrode group is insufficient, the support effect on the electrode group is not obvious, the explosion-proof valve exhaust is not smooth, 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 protrusion 121 and the second protrusion 122 obstruct the flow of high-temperature and high-pressure gas. The flow space of high-temperature and high-pressure gas along the first direction is insufficient, which obstructs the explosion-proof valve. The explosion-proof valve does not exhaust smoothly, the exhaust efficiency is low, the pass rate of battery thermal runaway test is low, and the battery is defective.

[0067] In summary, it is evident that the size design and position arrangement of the first protrusion 121 and the second protrusion 122 have a significant impact on the electrode group support effect and the explosion-proof valve venting effect. When the size design defined in this embodiment is adopted, it can be ensured that the support structure 120 provides good support for the electrode group, while the explosion-proof valve venting is not affected, which greatly improves the pass rate of battery thermal runaway test and ensures high battery safety performance.

[0068] Example 2

[0069] This embodiment provides a battery that differs from the battery in Embodiment 1 in that: in this embodiment, the mounting hole 110 and the support structure 120 are disposed on the housing, and the insulating component is located on the side of the housing where the support structure 120 is provided, and the insulating component is sandwiched between the housing and the electrode assembly. When the battery experiences thermal runaway, the temperature inside the housing rises sharply and far exceeds the melting point of the insulating component, causing the insulating component to melt into a liquid state and flow along with the electrolyte. At this time, the support structure 120 on the housing can support the electrode assembly, thereby forming a flow space between the electrode assembly and the housing, thus ensuring that the exhaust channel of the explosion-proof valve is not blocked, the exhaust is relatively smooth, the exhaust efficiency is high, and the battery has good safety.

[0070] Optionally, the support structure 120 includes a first boss 121 and a second boss 122, which can be stamped onto the housing using a jig.

[0071] The remaining structure of the battery in this embodiment is the same as that 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 of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery, characterized in that, include: The housing has a hollow interior forming a receiving cavity, and at least one side of the housing has an opening communicating with the receiving cavity. The electrode assembly passes through the opening and is installed into the housing. A cover plate body is encapsulated at the opening and connected to the housing; one of the cover plate body and the housing is provided with a mounting hole and a support structure, the mounting hole is used to install an explosion-proof valve, and the support structure includes a first boss and a second boss, both of which are oriented toward the pole group, and the first boss is located on the side close to the mounting hole along the first direction; Wherein, the dimension of the cover plate body or the shell along the first direction is L, the dimension of the cover plate body or the shell along the second direction is W, and the sum of the dimensions of all the first bosses and all the second bosses along the first direction is L1; The mounting holes and the support structure are provided on the cover plate body. The support structure is provided in two sets, and the two sets of support structures are respectively arranged on both sides of the mounting holes along the first direction. The two sets of support structures are symmetrical about the central axis a of the cover plate body along the second direction. In each set of support structures, there is one first boss and two second bosses. One first boss and two second bosses are arranged in a triangular array, and the two second bosses are symmetrical about the central axis b of the cover plate body along the first direction. The first boss has a dimension of B1 along the first direction, a dimension of A2 along the second direction, a dimension of B2 along the first direction, and a dimension of A4 along the second direction. ； The relationship between L1 and L satisfies: 0.25 ≤ L1 / L ≤ 0.45; The relationship between W1 and W satisfies: 0.6 ≤ W1 / W ≤ 0.8; When the battery experiences thermal runaway, the support structure supports the electrode assembly to create a gas flow space between the electrode assembly and the cover plate body or the housing.

2. The battery according to claim 1, characterized in that, The mounting hole has a dimension of A1 along the second direction, and the distance between the sidewalls of two adjacent second bosses along the second direction is A3. A1, A2, and A3 satisfy the following condition: A2 < A3 < A1.

3. The battery according to claim 1, characterized in that, The battery includes an insulating component located on the side of the cover plate body where the supporting structure is provided, and the insulating component is sandwiched between the cover plate body and the electrode assembly.

4. The battery according to claim 3, characterized in that, The insulating component has a clearance groove on the side facing the cover plate body, and the support structure is accommodated in the clearance groove.

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

6. 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, and the cross-sectional area of ​​the pole group is S. S1 and S satisfy the following condition: 0.3≤S1 / S≤0.

45.

7. The battery according to claim 1, characterized in that, The mounting hole and the support structure are provided on the housing. The battery includes an insulating component, which is located on the side of the housing where the support structure is provided. The insulating component is sandwiched between the housing and the electrode assembly.

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