Battery structure

Abstract

The present invention relates to the technical field of batteries, and discloses a battery structure, which comprises: a shell in which a cavity is formed; the welding seam is arranged on the surface of one side of the shell and extends in the length direction; the welding seam protrudes towards the cavity from the inner wall of the shell; the pole group is arranged in the cavity; the at least two elastic pieces are respectively arranged on two opposite sides of the pole group along the height direction; a sunken part is formed in one surface, deviating from the pole group, of the elastic piece; the welding seam extends into the sunken part; according to the battery structure provided by the invention, the elastic piece is arranged, the concave part is formed in the surface, deviating from the pole group, of the elastic piece, and the concave part is matched with the welding seam, so that the welding seam is effectively isolated from the pole group, assembly damage is reduced, and pole group assembly is prevented from being influenced by the welding seam; the number of the elastic pieces is at least two, and the elastic pieces are arranged on the two opposite sides of the pole group in the height direction, so that the defect that the pole group moves, is damaged and the like due to the unreasonable gap between the pole group and the shell is overcome, and the product yield of the assembled pole group is improved.

Description

Technical Field

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

[0002] With the rapid development of new energy, electric vehicles have increasingly higher requirements for batteries. Compared with traditional batteries, blade batteries have advantages such as high energy density, high space utilization, and good heat dissipation.

[0003] However, there are many problems when assembling the electrode assembly of the blade battery into the casing.

[0004] In the prior art, the casing of the blade battery is a narrow and thin-walled structure, which is made by welding. The casing has a weld seam at the welding interface that protrudes towards the electrode assembly. When the battery is installed, the weld seam is prone to rubbing against the insulating film, which affects the assembly of the electrode assembly. In addition, there is often a gap between the electrode assembly and the inner wall of the casing. When the battery is installed, the electrode assembly is prone to large movement due to improper gap configuration, which can damage the electrode sheet, tabs, and insulating film, affecting the assembly of the electrode assembly. Summary of the Invention

[0005] In view of this, the present invention provides a battery structure to solve the problem that the protruding weld seam at the housing and the gap between the electrode assembly and the housing affect the assembly of the electrode assembly.

[0006] The present invention provides a battery structure, comprising: a housing having a cavity inside; a weld seam provided on one side surface of the housing and extending along the length direction; the weld seam protruding from the inner wall of the housing toward the cavity; an electrode assembly disposed in the cavity; and at least two elastic members disposed on opposite sides of the electrode assembly along the length direction; the side of the elastic member facing away from the electrode assembly having a recessed portion, and the weld seam extending into the recessed portion.

[0007] Beneficial effects: By incorporating elastic elements with recesses on the side facing away from the electrode assembly, the recesses effectively isolate the weld from contact with the electrode assembly, reducing assembly damage and preventing the weld from affecting the electrode assembly assembly. At least two elastic elements are provided, positioned on opposite sides of the electrode assembly along its length. These elements, located in the gap between the housing and the electrode assembly, prevent electrode movement and damage caused by improper gaps between the two. Simultaneously, the elasticity of the elements themselves keeps the electrode assembly stable within the housing. When the electrode assembly moves, the elastic elements provide excellent cushioning, improving the product yield of the assembled electrode assembly.

[0008] In one alternative embodiment, the elastic member includes a first insert and a second insert connected together, the first insert protruding relative to the second insert toward a side away from the pole group, to form the recess between the first insert and the second insert.

[0009] Beneficial effects: The first insert is provided in two parts and is respectively connected to the opposite sides of the second insert. When the electrode assembly is assembled with the housing, the second insert is positioned opposite to the weld. The first insert protrudes from the side away from the electrode assembly relative to the second insert, so as to fully fill the gap between the electrode assembly and the housing and prevent the electrode assembly from shifting or being damaged.

[0010] In one alternative embodiment, along the height direction, the thickness of the first inlay is T1 and the thickness of the second inlay is T2, satisfying 0.1mm≤(T1-T2)≤0.2mm.

[0011] Beneficial effects: The thickness difference between the first insert and the second insert is (T1-T2), where the value of (T1-T2) is within the range of 0.1mm≤(T1-T2)≤0.2mm. This setting ensures that the first insert fully fills the gap, and avoids the elastic element being too thick, which would affect assembly. If the thickness difference (T1-T2) between the first insert and the second insert is too large, the elastic element will be too thick, making it difficult for the electrode assembly to fit into the shell, thus affecting assembly efficiency. If the thickness difference (T1-T2) between the first insert and the second insert is too small, the gap cannot be effectively filled, which may cause the electrode assembly to move around significantly, affecting product yield.

[0012] In one alternative embodiment, along the height direction, a distance H1 is left between the first insert and the inner wall of the housing, satisfying 0.6mm≤(T1+H1)≤0.75mm.

[0013] Beneficial effects: The sum of the spacing H1 and the thickness T1 of the first inlay is within the range of 0.6mm≤(T1+H1)≤0.75mm to meet the design requirements of the electrode assembly and the housing structure. This setting avoids the space utilization of the battery structure from being too large, and also avoids the assembly of the electrode assembly from being too small, which would lead to the electrode assembly and the housing being in too tight contact, increasing the risk of wear.

[0014] In one alternative embodiment, the width of the second insert along the thickness direction is W, satisfying 4mm≤W≤5mm.

[0015] Beneficial effects: The width W of the second insert is in the range of 4mm≤W≤5mm. This setting ensures that the size of the recess in the thickness direction is sufficient to accommodate the weld. If the width W of the second insert is too small, the recess will not be able to effectively accommodate the weld, affecting the assembly of the electrode assembly. On the other hand, it avoids the size of the first insert being affected by the width of the second insert being too large, thus affecting the filling effect of the elastic element in the gap between the electrode assembly and the housing.

[0016] In one alternative embodiment, along the height direction, the height of the weld relative to the protruding portion of the inner wall of the housing is H2, satisfying 0.05mm≤H2≤0.15mm.

[0017] Beneficial effects: The value range of the height H2 of the weld protruding part relative to the inner wall of the shell is 0.05mm≤H2≤0.15mm. This setting avoids the weld protruding part relative to the inner wall of the shell being too high, thus avoiding increasing the assembly difficulty between the electrode group and the shell. On the other hand, it avoids the weld protruding part relative to the inner wall of the shell being too low, which would affect the welding quality and thus affect the structural strength of the shell at the welding position.

[0018] In one optional embodiment, a plurality of elastic elements are provided on both sides of the pole group along the length direction, and the plurality of elastic elements are respectively provided on the opposite sides of the pole group.

[0019] Beneficial effects: Several elastic elements are distributed along the length of the electrode assembly, and the elastic elements on opposite sides of the electrode assembly are arranged one-to-one to ensure the stability of the electrode assembly and the housing during assembly, provide comprehensive buffering, effectively prevent the electrode assembly from shifting, prevent electrode assembly from being damaged during use, and extend the service life of the battery structure.

[0020] In one alternative embodiment, the elastic element further includes a third insert, which is connected to the side of the first insert away from the second insert at a predetermined angle, and the third insert is fitted to the opposite sides of the electrode assembly along the thickness direction.

[0021] Beneficial effects: The end of the first insert away from the second insert is connected to a third insert. The third insert is connected to the first insert at a predetermined angle, specifically, but not limited to, a perpendicular connection, so that the elastic element forms a C-shaped structure. The C-shaped elastic element is connected to the opposite sides of the electrode assembly along the height direction. The first insert and the second insert are attached to one side of the electrode assembly along the height direction, and the third insert is attached to the opposite two sides of the electrode assembly along the thickness direction, which improves the connection stability of the elastic element on the electrode assembly and prevents the elastic element from falling off when the electrode assembly is inserted into the shell.

[0022] In one alternative embodiment, the cavity extends through at least one end of the housing along its length to form an opening, and the inner wall of the housing is chamfered around the opening.

[0023] Beneficial effects: The inner wall of the edge of the portion surrounding the opening of the housing is inclined towards the outer periphery of the housing to form a chamfer, which facilitates the insertion of the electrode assembly into the housing, reduces the risk of the electrode assembly being scratched, and improves the safety performance of the electrode assembly.

[0024] In one optional embodiment, the electrode assembly includes a substrate and an insulating element, the insulating element covering the periphery of the substrate; the elastic element is fitted to the insulating element. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a disassembly diagram of the battery structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the housing of the present invention;

[0028] Figure 3 This is a schematic diagram showing the cooperation between the pole assembly and the elastic element of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the elastic element of the present invention;

[0030] Figure 5 This is a top view of the elastic element of the present invention;

[0031] Figure 6 This is a side view of the elastic element of the present invention;

[0032] Figure 7 This is a top view of the housing of the present invention;

[0033] Figure 8 For the present invention Figure 7 Schematic diagram of the cross section at point AA;

[0034] Figure 9 For the present invention Figure 8 Enlarged view of point C in the middle;

[0035] Figure 10 For the present invention Figure 7 Schematic diagram of the cross section at point BB;

[0036] Figure 11 For the present invention Figure 10 Enlarged view of point D in the middle;

[0037] Figure 12 This is a cross-sectional schematic diagram of the battery structure of the present invention;

[0038] Figure 13 For the present invention Figure 12 Enlarged diagram of point E in the middle.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Housing; 11. Cavity; 12. Opening; 13. Chamfer; 2. Weld; 3. Electrode assembly; 31. Substrate; 32. Insulator; 33. Electrode tab; 4. Elastic element; 41. First insert; 42. Second insert; 43. Third insert; 5. Recess; 6. Support end plate; 7. Cover plate assembly. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

[0042] 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 this 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 this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] 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 according to the specific circumstances.

[0044] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] The following is combined with Figures 1 to 13 The following describes embodiments of the present invention.

[0046] According to an embodiment of the present invention, a battery structure is provided, comprising: a housing 1 having a cavity 11 formed therein; a weld 2 provided on one side surface of the housing 1 and extending along the length direction; the weld 2 protruding from the inner wall of the housing 1 toward the cavity 11; an electrode assembly 3 disposed in the cavity 11; and at least two elastic members 4 disposed on opposite sides of the electrode assembly 3 along the length direction; a recess 5 is formed on the side of the elastic member 4 facing away from the electrode assembly 3, and the weld 2 extends into the recess 5.

[0047] It should be noted that the battery structure can be, but is not limited to, blade batteries.

[0048] Specifically, when the electrode assembly 3 is assembled with the housing 1, an elastic element 4 is provided at the electrode assembly 3, and a recess 5 is formed on the side of the elastic element 4 facing away from the electrode assembly 3. Therefore, when the electrode assembly 3 is inserted into the housing, the electrode assembly 3 and the elastic element 4 simultaneously enter the cavity 11. The weld 2 is positioned opposite to the recess 5, allowing at least a portion of the weld 2 to extend into the recess 5, thus spatially isolating the weld 2 from the electrode assembly 3 and preventing the weld 2 from rubbing against the electrode assembly 3, thereby affecting the assembly of the electrode assembly 3. Simultaneously, since at least two elastic elements 4 are provided and are located at the electrode assembly 1, the elastic element 4 provides a flexible element that is not directly related to the assembly. On opposite sides of the length of the electrode group 3, the elastic elements 4 are respectively located in the gap between the housing 1 and the electrode group 3. This avoids large displacement of the electrode group 3 when it enters the housing due to unreasonable gaps, thereby preventing damage to the electrode group 3 and preventing the gap between the housing 1 and the electrode group 3 from affecting the assembly. At the same time, the elasticity of the elastic element 4 itself can keep the electrode group 3 stable in the housing 1. When the electrode group 3 moves, the elastic element 4 has a good buffering effect, improving the product yield of the electrode group 3 after assembly.

[0049] In this embodiment, an elastic element 4 is provided, and a recessed portion 5 is formed on the side of the elastic element 4 facing away from the electrode assembly 3. The recessed portion 5 cooperates with the weld 2 to effectively isolate the weld 2 from contact with the electrode assembly 3, reduce assembly damage, and prevent the weld 2 from affecting the assembly of the electrode assembly 3. At least two elastic elements 4 are provided and are respectively located on opposite sides of the electrode assembly 3 along the length direction. The elastic elements 4 located on opposite sides of the electrode assembly 3 along the length direction prevent the electrode assembly 3 from moving or being damaged due to unreasonable gap between the electrode assembly 3 and the housing 1. At the same time, the elasticity of the elastic element 4 itself can keep the electrode assembly 3 stable within the housing 1. When the electrode assembly 3 moves, the elastic element 4 has a good buffering effect, which improves the product yield of the assembled electrode assembly 3.

[0050] It should be noted that the material selection of the elastic element 4 must have good elasticity to ensure compatibility with gaps of different sizes and to provide good cushioning performance. The material selection of the elastic element 4 can also have good air permeability to facilitate the exhaust of the electrode assembly 3. Furthermore, the material of the elastic element 4 can be an elastic foam adhesive structure. Foam adhesive is an elastic material with a porous structure, which can not only effectively fill the gap between the electrode assembly 3 and the shell 1, but also reduce the impact on the exhaust performance of the electrode assembly 3.

[0051] In some embodiments, combined with Figures 4 to 6 As shown, the elastic member 4 includes a first insert 41 and a second insert 42 connected together. The first insert 41 protrudes from the side opposite to the pole group 3 relative to the second insert 42, so as to form a recess 5 between the first insert 41 and the second insert 42.

[0052] Specifically, there are two first inserts 41, which are respectively connected to the opposite sides of the second insert 42. When the electrode assembly 3 is assembled with the housing 1, the second insert 42 is positioned opposite to the weld 2. The first insert 41 protrudes from the side away from the electrode assembly 3 relative to the second insert 42, so as to fully fill the gap between the electrode assembly 3 and the housing 1 and prevent the electrode assembly 3 from shifting or being damaged.

[0053] In some embodiments, combined with Figure 6 As shown, along the height direction, the thickness of the first inlay 41 is T1 and the thickness of the second inlay 42 is T2, satisfying 0.1mm≤(T1-T2)≤0.2mm.

[0054] Specifically, along the height direction, the thickness of the first insert 41 is greater than the thickness of the second insert 42, ensuring that the first insert 41 can be effectively positioned within the gap between the electrode assembly 3 and the housing 1. The thickness difference between the first insert 41 and the second insert 42 is (T1-T2), where the value of (T1-T2) is within the range of 0.1mm≤(T1-T2)≤0.2mm. This setting ensures that the first insert 41 fully fills the gap, while avoiding excessive thickness of the elastic element 4 from affecting assembly. If the thickness difference (T1-T2) between the first insert 41 and the second insert 42 is too large, the elastic element 4 will be too thick, making it difficult for the electrode assembly 3 to be inserted into the housing, thus affecting assembly efficiency. If the thickness difference (T1-T2) between the first insert 41 and the second insert 42 is too small, the gap cannot be effectively filled, making it easy for the electrode assembly 3 to move around significantly, affecting product yield.

[0055] Optionally, the value of (T1-T2) can be any value among 0.1mm, 0.11mm, 0.15mm, 0.17mm, 0.19mm, 0.2mm, etc., or a value between any two values.

[0056] In some embodiments, combined with Figure 13As shown, along the height direction, there is a gap H1 between the first insert 41 and the inner wall of the shell 1, which satisfies 0.6mm≤(T1+H1)≤0.75mm.

[0057] Specifically, along the height direction, the first insert 41 is spaced apart from the inner wall of the housing 1 by a distance of H1. The sum of the distance H1 and the thickness T1 of the first insert 41 is in the range of 0.6mm≤(T1+H1)≤0.75mm to meet the structural design requirements of the electrode assembly 3 and the housing 1. This arrangement avoids the space utilization of the battery structure from being too large, and also avoids the assembly of the electrode assembly 3 from being too small, which would result in the electrode assembly 3 being in too tight a contact with the housing 1 and increase the risk of wear.

[0058] Optionally, the value of (T1+H1) can be any value among 0.6mm, 0.61mm, 0.68mm, 0.7mm, 0.74mm, 0.75mm, etc., or a value between any two values.

[0059] In some embodiments, combined with Figure 5 As shown, along the thickness direction, the width of the second insert 42 is W, which satisfies 4mm≤W≤5mm.

[0060] Specifically, along the thickness direction, the width W of the second insert 42 is in the range of 4mm≤W≤5mm. This setting ensures that the size of the recess 5 in the thickness direction is sufficient to accommodate the weld 2. If the width W of the second insert 42 is too small, the recess 5 will not be able to effectively accommodate the weld 2, affecting the assembly of the electrode assembly 3. On the other hand, it avoids affecting the size of the first insert 41 due to the excessive width of the second insert 42, thus affecting the filling effect of the elastic element 4 in the gap between the electrode assembly 3 and the housing 1.

[0061] Optionally, the value of W can be any value among 4mm, 4.1mm, 4.5mm, 4.7mm, 4.9mm, 5mm, etc., or a value between any two values.

[0062] In some embodiments, combined with Figure 9 As shown, along the height direction, the height of weld 2 relative to the protruding part of the inner wall of shell 1 is H2, which satisfies 0.05mm≤H2≤0.15mm.

[0063] Specifically, along the height direction, the height H2 of the protrusion of weld 2 relative to the inner wall of housing 1 is in the range of 0.05mm≤H2≤0.15mm. This setting avoids the weld 2 protruding too high relative to the inner wall of housing 1, thus avoiding increasing the assembly difficulty of electrode group 3 and housing 1. On the other hand, it avoids the weld 2 protruding too low relative to the inner wall of housing 1, which would affect the welding quality and thus affect the structural strength of housing 1 at the welding position.

[0064] Optionally, the value of H2 can be any value among 0.05mm, 0.06mm, 0.08mm, 0.1mm, 0.14mm, 0.15mm, etc., or a value between any two values.

[0065] It should be noted that the specific values ​​of the above parameters can be flexibly adjusted according to actual production needs and application scenarios to ensure the best fit between the electrode group 3 and the housing 1.

[0066] In some embodiments, combined with Figure 3 As shown, several elastic elements 4 are provided on both sides of the pole group 3 along the length direction, and the several elastic elements 4 are respectively provided on the opposite sides of the pole group 3.

[0067] Specifically, at least two elastic elements 4 are provided and are respectively located on opposite sides of the electrode assembly 3 along the length direction. On this basis, several elastic elements 4 are distributed along the length direction of the electrode assembly 3. At the same time, the elastic elements 4 located on opposite sides of the electrode assembly 3 are arranged one-to-one to ensure the stability of the electrode assembly 3 and the housing 1 during the assembly process, provide a comprehensive buffering effect, effectively prevent the electrode assembly 3 from moving, and also prevent the electrode assembly 3 from shifting during use, prevent the electrode assembly 3 from being damaged, and extend the service life of the battery structure.

[0068] In some embodiments, combined with Figures 4 to 6 As shown, the elastic member 4 also includes a third insert 43, which is connected to the side of the first insert 41 away from the second insert 42 at a predetermined angle, and the third insert 43 is attached to the opposite sides of the pole group 3 along the thickness direction.

[0069] Specifically, the end of the first insert 41 away from the second insert 42 is connected to a third insert 43. The third insert 43 is connected to the first insert 41 at a predetermined angle, which can be, but is not limited to, a perpendicular connection, so that the elastic element 4 forms a C-shaped structure. The C-shaped elastic element 4 is connected to the opposite sides of the pole group 3 along the height direction. The first insert 41 and the second insert 42 are attached to one side of the pole group 3 along the height direction, and the third insert 43 is attached to the opposite two sides of the pole group 3 along the thickness direction, which improves the connection stability of the elastic element 4 on the pole group 3 and prevents the elastic element 4 from falling off when the pole group 3 is inserted into the shell.

[0070] It should be noted that the elastic element 4 and the pole assembly 3 can be connected by, but is not limited to, adhesive bonding.

[0071] In some embodiments, combined with Figure 11 As shown, the cavity 11 extends through at least one end of the shell 1 along its length to form an opening 12, and the inner wall of the shell 1 forms a chamfer 13 around the opening 12.

[0072] Specifically, when the electrode assembly 3 is assembled with the housing 1, one end of the electrode assembly 3 passes through the opening 12 and enters the housing. An elastic element 4 is connected near the end of the electrode assembly 3 to provide protection when the end of the electrode assembly 3 passes through the opening 12, preventing the electrode assembly 3 from directly contacting the weld 2 and reducing friction damage. The inner wall of the edge of the housing 1 surrounding the opening 12 is inclined towards the outer periphery of the housing 1 to form a chamfer 13, so as to facilitate the entry of the electrode assembly 3 into the housing, reduce the risk of the electrode assembly 3 being scratched, and improve the safety performance of the electrode assembly 3.

[0073] In some embodiments, combined with Figure 1 As shown, the electrode assembly 3 includes a substrate 31 and an insulating member 32, with the insulating member 32 covering the periphery of the substrate 31; the elastic member 4 is attached to the insulating member 32.

[0074] Specifically, the insulating element 32 covers the periphery of the base 31, and the elastic element 4 is fitted onto the surface of the insulating element 32 to prevent the electrode assembly 3 from being scratched and damaged when it is inserted into the casing; one end of the base 31 is provided with an electrode tab 33, and the battery structure also includes a support end plate 6 and a cover plate assembly 7. The cover plate assembly 7 is fixed to the opening 12, the support end plate 6 is sandwiched between the cover plate assembly 7 and the second end of the electrode assembly 3, and the electrode tab 33 passes through the support assembly to connect with the cover plate assembly 7.

[0075] Specifically, the following battery structures with different values ​​of T1, T2, T3, H1, H2, and (T1-T2) and (T1+H1) underwent a basic test for electrode assembly 3 installation. The values ​​of (T1-T2) were within the range of 0.1mm ≤ (T1-T2) ≤ 0.2mm, (T1+H1) within the range of 0.6mm ≤ (T1+H1) ≤ 0.75mm, W within the range of 4mm ≤ W ≤ 5mm, and H2 within the range of 0.05mm ≤ H2 ≤ 0.15mm. The thickness of the insulating component 32 was 0.1mm, and the thickness of the casing 1 was T3. The casing 1 was manufactured using a welding process and was welded to the cover assembly 7. The insulating component 32 was made of polypropylene (PP), a thermoplastic synthetic resin. The test results showed that, firstly, the electrode assembly 3 was not damaged during installation. The test included three aspects: First, whether there were any defects such as scratches, tearing of the tabs 33, or detachment of the elastic element 4; second, the welding yield and helium test yield of the casing and cover assembly 7; and third, whether the thermal runaway met the design requirements. It should be noted that the welding yield of the casing and cover assembly 7 refers to the proportion of qualified welded products to the total production quantity. The helium test yield, also known as helium mass spectrometry leak detection, is a process of testing the sealing of the welded battery casing 1, using helium as a tracer gas to detect any leaks. Meeting the design requirements for thermal runaway means that when the battery experiences thermal runaway under specific test conditions, its performance, such as the thermal runaway trigger time, released heat, peak temperature, gas release, and whether an explosion or open flame occurs, is within the pre-set safety design standards of the product. The test results are shown in Table 1.

[0076] Table 1. Results of the Electrode Group Shell-Insertion Foundation Test

[0077]

[0078]

[0079] As can be seen from Table 1, when the value of (T1-T2) is within the range of 0.1mm≤(T1-T2)≤0.2mm, the value of (T1+H1) is within the range of 0.6mm≤(T1+H1)≤0.75mm, the value of W is within the range of 4mm≤W≤5mm, and the value of H2 is within the range of 0.05mm≤H2≤0.15mm, the performance indicators of the electrode assembly after being installed in the housing can stably meet the design requirements.

[0080] Specifically, the following battery structures with different values ​​of T1, T2, T3, H1, H2, and (T1-T2) and (T1+H1) were subjected to comparative tests on electrode assembly insertion. In Comparative Example 1, the value of (T1-T2) was 0.25, exceeding the upper limit of the range; in Comparative Example 2, the value of (T1+H1) was 0.8, exceeding the upper limit of the range; in Comparative Example 3, the value of (T1+H1) was 0.85, exceeding the upper limit of the range; in Comparative Example 4, the value of (T1+H1) was 0.55, below the lower limit of the range; and in Comparative Example 5, the value of (T1-T2) was 0.05, below the lower limit of the range. Other conditions were the same as the basic electrode assembly insertion test. The test results were observed to determine whether the electrode assembly was damaged during insertion, i.e., whether there were any defects such as scratches, tearing of the tabs, or detachment of the elastic components.

[0081] Table 2 shows the results of the comparative test of the electrode assembly insertion into the shell.

[0082]

[0083] As shown in Table 2, when the parameters (T1-T2) and (T1+H1) are outside the range, electrode assembly 3 is easily damaged and its overall performance is affected. Conversely, when the parameter values ​​are within the range (as shown in the basic tests in Table 1), electrode assembly 3 is stable and its overall performance is stable. It should be noted that the test results of Comparative Example 2 also include a battery yield of less than 98% and thermal runaway meeting the design requirements. The test results of Comparative Example 3 also include a battery yield of less than 98% and thermal runaway meeting the design requirements. The test results of Comparative Example 4 are as follows: when the electrode assembly 3 is installed in the casing, scratches and damages such as tearing of the tab 33 are found. The elastic element 4 is prone to excessive interference with the weld 2, resulting in damage. The battery yield is less than 98%, and the difficulty of installing the electrode assembly 3 in the casing is increased. The test results of Comparative Example 5 are as follows: when the electrode assembly 3 is installed in the casing, there is obvious interference between the second insert 42 and the weld 2. It is difficult to ensure that the elastic element 4 has a (T1-T2) of 0.05 during manufacturing. The risk of damage and displacement of the elastic element 4 is high.

[0084] In Comparative Example 1, the value of parameter (T1-T2) is 0.25, which exceeds the upper limit of the range. As a result, although the pole group 3 was not damaged when it was inserted into the shell, the production and assembly of the elastic element 4 were more difficult due to the thinness of the second insert 42, which affected the overall performance.

[0085] In Comparative Example 2, the value of parameter (T1+H1) is 0.8, which exceeds the upper limit of the range. As a result, although the electrode assembly 3 was not damaged when it was installed in the casing, the battery capacity was affected because the elastic element 4 occupied a large amount of battery space, thus reducing the overall performance.

[0086] In Comparative Example 3, the value of parameter (T1+H1) is 0.85, which exceeds the upper limit of the range. As a result, although the electrode assembly 3 was not damaged when it was installed in the casing, the battery capacity was affected because the elastic element 4 occupied a large amount of battery space, thus reducing the overall performance.

[0087] In Comparative Example 4, the value of parameter (T1+H1) is 0.55, which is lower than the lower limit of the range. This causes problems such as scratching damage and tearing of electrode tab 33 when electrode group 3 is installed in the casing due to the small gap between electrode group 3 and the casing and the tight fit. The elastic part 4 is prone to interference with weld 2, and is also prone to damage due to excessive interference with weld 2. The battery yield is less than 98%, the difficulty of installing electrode group 3 in the casing increases, and the overall performance is affected.

[0088] In Comparative Example 5, the value of (T1-T2) is 0.05, which is lower than the lower limit of the range. This results in the recess 5 having too small a depth in the height direction. When the electrode assembly 3 is inserted into the shell, there is a tendency for the second insert 42 to interfere significantly with the weld 2. Furthermore, it is difficult to ensure that (T1-T2) is 0.05 during the manufacturing of the elastic element 4. The elastic element 4 is at high risk of damage or displacement, which affects the overall performance of the battery structure.

[0089] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A battery structure, characterized in that, include: The shell (1) has a cavity (11) inside; A weld (2) is provided on one side surface of the housing (1) and extends along the length direction; the weld (2) protrudes from the inner wall of the housing (1) toward the cavity; A pole group (3) is disposed in the cavity (11); At least two elastic elements (4) are provided and are respectively disposed on opposite sides of the pole group (3) along the length direction; a recess (5) is formed on the side of the elastic element (4) facing away from the pole group (3), and the weld (2) extends into the recess (5).

2. The battery structure according to claim 1, characterized in that, The elastic member (4) includes a first insert (41) and a second insert (42) connected together. The first insert (41) protrudes toward the side away from the pole group (3) relative to the second insert (42) to form the recess (5) between the first insert (41) and the second insert (42).

3. The battery structure according to claim 2, characterized in that, Along the height direction, the thickness of the first inlay (41) is T1 and the thickness of the second inlay (42) is T2, satisfying 0.1mm≤(T1-T2)≤0.2mm.

4. The battery structure according to claim 3, characterized in that, Along the height direction, there is a gap H1 between the first insert (41) and the inner wall of the shell (1), which satisfies 0.6mm≤(T1+H1)≤0.75mm.

5. The battery structure according to claim 4, characterized in that, Along the thickness direction, the width of the second insert (42) is W, which satisfies 4mm≤W≤5mm.

6. The battery structure according to claim 4, characterized in that, Along the height direction, the height of the weld (2) relative to the protruding part of the inner wall of the shell (1) is H2, which satisfies 0.05mm≤H2≤0.15mm.

7. The battery structure according to any one of claims 1 to 6, characterized in that, The elastic element (4) is provided in a plurality of units on both sides of the pole group (3) along the length direction, and the plurality of elastic elements (4) are respectively provided on the opposite sides of the pole group (3).

8. The battery structure according to any one of claims 2 to 6, characterized in that, The elastic element (4) further includes a third insert (43), which is connected to the side of the first insert (41) away from the second insert (42) at a predetermined angle, and the third insert (43) is attached to the opposite sides of the pole assembly (3) along the thickness direction.

9. The battery structure according to any one of claims 1 to 6, characterized in that, The cavity (11) extends through at least one end of the shell (1) along its length to form an opening (12), and the inner wall of the shell (1) forms a chamfer (13) around the opening (12).

10. The battery structure according to any one of claims 1 to 6, characterized in that, The electrode assembly (3) includes a substrate (31) and an insulating element (32), wherein the insulating element (32) covers the periphery of the substrate (31); The elastic element (4) is fitted together with the insulating element (32).

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