Insulating part capable of stretching in thickness direction, battery top cover and battery

Abstract

The utility model discloses an insulating part capable of stretching in the thickness direction, a battery top cover and a battery, the insulating part comprises an insulating body, and an elastic abutting part is arranged on one side of the thickness of the insulating body; the elastic abutting piece comprises a deformation part and an abutting part, the deformation part is used for connecting the insulating body and the abutting part, and when the abutting part is pressed, the deformation part bends and deforms to enable the abutting part to be close to the insulating body. By adopting the scheme, the utility model provides the insulating part capable of stretching in the thickness direction, the battery top cover and the battery, which can ensure that the abutting part is tightly abutted against the battery cell so as to ensure that the battery cell is stably mounted by downwards abutting against the battery cell through the abutting part and pressing and bending the deformation part.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and in particular relates to an insulating member which is retractable in thickness direction, a battery top cover and a battery. Background Art

[0002] With the development of technology, power batteries are widely used in electric vehicles as energy systems.

[0003] The existing power battery has a battery shell, a battery cell and a battery top cover, and the battery cell is encapsulated in the battery shell through the battery top cover. Specifically, the battery top cover includes a pole, a top cover sheet, and a lower plastic. The top cover sheet and the lower plastic are both provided with pole mounting holes, and the pole is inserted into the pole mounting hole for electrical connection between the battery cell and external electrical devices.

[0004] In addition, in order to ensure that the battery cell is stably installed in the battery casing, a filler is usually protruded from the lower side of the lower plastic in an integrated manner. The filler is in the form of a sheet or a block, so that the protruding filler presses downward against the battery cell to fill the gap between the battery cell and the lower plastic, thereby limiting the up and down movement of the battery cell.

[0005] However, there is still a certain gap between the filling piece and the battery cell, which makes it impossible to effectively fix the battery cell and causes the battery cell to move around in the battery casing and make abnormal noises. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of the utility model is to provide an insulating member, a battery top cover and a battery that are retractable in the thickness direction by abutting the battery cell downward with the abutting portion and bending the deformed portion under pressure, thereby ensuring that the abutting portion and the battery cell are tightly abutted to ensure stable installation of the battery cell.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] An insulating part that is retractable in the thickness direction is characterized by: comprising an insulating body, and an elastic abutment part is arranged on one side of the thickness of the insulating body; the elastic abutment part comprises a deformation part and an abutment part, the deformation part is used to connect the insulating body and the abutment part, and when the abutment part is compressed, the deformation part bends and deforms to make the abutment part close to the insulating body.

[0009] The utility model is further configured as follows: the deformation part is arranged at an angle, one end of the deformation part is connected to the insulating body, and the other end of the deformation part is connected to the abutment part; or, the deformation part includes at least two inclined bodies connected end to end to make the deformation part V-shaped, N-shaped, M-shaped or wavy, one end of the deformation part is connected to the insulating body, and the other end of the deformation part is connected to the abutment part.

[0010] The present utility model is further configured such that: the number of the inclined bodies is two so that the deformation part is in a V shape; one end of the V shape of the deformation part is connected to one end of the length of the insulating body, the other end of the V shape of the deformation part is connected to one end of the abutting part, and the opening of the V shape of the deformation part faces away from the other end of the insulating body along the length direction of the insulating body; the other end of the abutting part faces the other end of the insulating body along the length direction of the insulating body.

[0011] The present utility model is further configured such that: the elastic abutting member is integrally formed on the insulating body; or, the elastic abutting member is detachably arranged on the insulating body.

[0012] The present utility model is further configured such that: the number of the elastic abutting members is two, and they are respectively arranged at both ends of the length of the insulating body.

[0013] The present utility model is further configured such that: the insulating body includes a first insulating member and a second insulating member, and a partition area is arranged between the first insulating member and the second insulating member; one of the elastic abutting members is arranged at one end of the first insulating member away from the second insulating member, and the other elastic abutting member is arranged at one end of the second insulating member away from the first insulating member.

[0014] The present utility model is further configured such that: the thickness of the deformation part is s1, and 1 mm ≤ s1 ≤ 3 mm; and / or, the thickness of the abutting part is s2, and 5 mm ≤ s2 ≤ 10 mm.

[0015] A battery top cover includes a top cover sheet, the above-mentioned insulating member, a negative electrode assembly, and a positive electrode assembly; the insulating member is located below the top cover sheet, the negative electrode assembly is respectively connected to the top cover sheet and the insulating member, and the positive electrode assembly is respectively connected to the top cover sheet and the insulating member.

[0016] The present utility model is further configured as follows: The top cover sheet is provided with a first mounting hole and a second mounting hole, the insulating body is provided with a third mounting hole and a fourth mounting hole, the negative electrode assembly is mounted through the first mounting hole and the third mounting hole, and the positive electrode assembly is mounted through the second mounting hole and the fourth mounting hole; The top cover sheet is provided with a fifth mounting hole, an explosion-proof valve is arranged in the fifth mounting hole, a film is arranged above the fifth mounting hole to seal the fifth mounting hole, the insulating body is provided with a first mounting groove and a second mounting groove below the explosion-proof valve, and the first mounting groove and the second mounting groove are arranged separately. A first exhaust hole is arranged on the bottom wall of the first mounting groove, a second exhaust hole is arranged on the bottom wall of the second mounting groove, a first rib is arranged in the first mounting groove, the first rib connects the bottom wall of the first mounting groove and the side wall of the first mounting groove, a second rib is arranged in the second mounting groove, the second rib connects the bottom wall of the second mounting groove and the side wall of the second mounting groove, one side of the first mounting groove facing the second mounting groove and one side of the second mounting groove facing the first mounting groove are both open, the insulating body is provided with a first bottom surface below the second mounting groove, and the horizontal position of the bottom wall of the first mounting groove is lower than the horizontal position of the first bottom surface; The top cover sheet is provided with a first liquid injection hole, the insulating body is provided with a second liquid injection hole below the first liquid injection hole, and the insulating body protrudes with a plurality of top convex parts below the second liquid injection hole, and the top convex parts are arranged at intervals along the circumferential direction of the second liquid injection hole.

[0017] A battery includes a battery housing, an electric core, and the above-mentioned battery top cover. The electric core is located in the battery housing, and the battery top cover is used to seal the electric core in the battery housing, and the abutting part abuts downward against the electric core.

[0018] By adopting the above technical solutions, 1. In the state where the battery is assembled, the electric core is strongly pressed by the abutting part, so that the electric core is stably clamped between the abutting part and the battery housing, thereby preventing the electric core from moving and making abnormal noises. 2. Due to the bending characteristic of the deformation part, the distance between the electric core and the insulating body can be within a certain range, which can ensure that the deformation part deforms so that the abutting part stably presses on the electric core, and the adaptability is better. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a part drawing of the first embodiment of the present utility model;

[0021] Figure 2 It is the part drawing of the first embodiment of the present utility model;

[0022] Figure 3 It is the sectional view of the first embodiment of the present utility model;

[0023] Figure 4 It is Figure 2 the partial enlarged view of;

[0024] Figure 5 It is Figure 3 the partial enlarged view of;

[0025] Figure 6 It is the schematic diagram of the second embodiment of the present utility model;

[0026] Figure 7 It is the schematic diagram of the third embodiment of the present utility model;

[0027] Figure 8 It is the schematic diagram of the fourth embodiment of the present utility model;

[0028] Figure 9 It is the assembly drawing of the fifth embodiment of the present utility model;

[0029] Figure 10 It is the sectional view of the fifth embodiment of the present utility model;

[0030] Figure 11 It is the exploded view of the fifth embodiment of the present utility model;

[0031] Figure 12 It is the part drawing of the second mounting seat and the fourth mounting seat in the fifth embodiment of the present utility model;

[0032] Figure 13 It is Figure 10 the partial enlarged view of.

[0033] Explanation of reference numerals:

[0034] 1. Insulating body;

[0035] 11. First insulating member; 12. Second insulating member; 13. Partition area; 14. First bottom surface; 15. Second liquid injection hole; 16. Top convex part;

[0036] 111. Third mounting hole; 112. First mounting groove; 113. First exhaust hole; 114. First rib; 121. Fourth mounting hole; 122. Second mounting groove; 123. Second exhaust hole; 124. Second rib;

[0037] 2. Elastic abutting member;

[0038] 21. Deformation part; 22. Abutting part;

[0039] 211. Tilted body;

[0040] 3. Top cover piece;

[0041] 31. First mounting hole; 32. Second mounting hole; 33. First jack; 34. Fourth jack; 35. Fifth mounting hole; 36. First liquid injection hole;

[0042] 4. Negative electrode assembly;

[0043] 41. First mounting seat; 42. Second mounting seat; 43. Negative electrode part; 44. First seal; 45. First connecting plug post;

[0044] 411. Second jack; 421. Third jack;

[0045] 5. Positive electrode assembly;

[0046] 51. Third mounting seat; 52. Fourth mounting seat; 53. Positive electrode part; 54. Second seal; 55. Second connecting plug post;

[0047] 511. Fifth jack; 521. Sixth jack;

[0048] 61. Explosion-proof valve; 62. Film. Detailed implementation mode

[0049] In order to enable those skilled in the art to better understand the present utility model and thus more clearly define the scope of protection required by the present utility model, the present utility model will be described in detail below with reference to certain specific embodiments of the present utility model. It should be noted that the following are only some specific implementation modes of the concept of the present utility model and only a part of the embodiments of the present utility model. The specific and direct descriptions of the relevant structures are only for the convenience of understanding the present utility model, and each specific feature does not of course and directly limit the implementation scope of the present utility model. Conventional selections and replacements made by those skilled in the art under the guidance of the concept of the present utility model shall be regarded as within the scope of protection required by the present utility model.

[0050] Embodiment 1:

[0051] As Figures 1-5 shown, the present utility model discloses an insulating member that can be telescoped in the thickness direction, including an insulating body 1. The length direction of the insulating body 1 is along the left-right direction, the width direction is along the front-back direction, and the thickness direction is along the up-down direction. Among them, an elastic abutting member 2 is provided on the lower side of the insulating body 1; specifically, the elastic abutting member 2 includes a deformation part 21 and an abutting part 22. The deformation part 21 is located between the abutting part 22 and the insulating body 1 and connects the insulating body 1 and the abutting part 22. Among them, the deformation part 21 can be bent and deformed, and the abutting part 22 is used to abut against the battery cell downward.

[0052] Therefore, 1. In the state where the battery is assembled, the abutting portion 22 presses firmly against the battery cell with high strength, so that the battery cell is stably clamped between the abutting portion 22 and the battery housing, thereby preventing the battery cell from moving and generating abnormal noises. 2. Since the deformation portion 21 has a bent characteristic, the distance between the battery cell and the insulating body 1 can ensure that the deformation portion 21 deforms within a certain range, so that the abutting portion 22 presses firmly against the battery cell, and the adaptability is better.

[0053] Among them, the deformation portion 21 in this embodiment includes two inclined bodies 211 connected end to end, so that the deformation portion 21 is in a V shape. In addition, one end of the V shape of the deformation portion 21 is connected to the insulating body 1, and the other inclined V-shaped end of the deformation portion 21 is connected to the abutting portion 22.

[0054] Therefore, 1. The deformation portion 21 in a V shape is formed by two inclined portions connected end to end. When the abutting portion 22 is pressed, the inclined portions are bent and deformed, so that the V-shaped opening of the deformation portion 21 shrinks, and the abutting portion 22 approaches the insulating body 1. And through the elastic reset of the deformation portion 21, the V-shaped opening of the deformation portion 21 expands, ensuring that the abutting portion 22 stably presses downward on the battery cell. 2. By arranging two inclined members, both inclined members can be bent and deformed when the abutting portion 22 is pressed to store potential energy, so as to reduce the bending amplitude of each inclined member and prevent the bending amplitude of each inclined member from being too large and causing breakage. 3. Since the deformation portion 21 is in a V shape, the two V-shaped ends of the deformation portion 21 for connecting the abutting portion 22 and the insulating body 1 overlap or are close to each other vertically. Therefore, the bending moment generated by the acting forces at both ends of the deformation portion 21 on the deformation portion 21 is smaller, preventing the deformation portion 21 from deflecting under the action of the bending moment and causing the abutting portion 22 to deflect and unable to effectively abut against the battery cell.

[0055] Preferably, one V-shaped end of the deformation portion 21 in this embodiment is connected to one length end of the insulating body 1, the other V-shaped end of the deformation portion 21 is connected to one end of the abutting portion 22, and the V-shaped opening of the deformation portion 21 faces away from the other end of the insulating body 1 along the length direction of the insulating body 1; the other end of the abutting portion 22 faces the other end of the insulating body 1 along the length direction of the insulating body 1.

[0056] Therefore, 1. Both ends of the deformation part 21 are respectively connected to the insulating body 1 and the outermost ends in the left-right direction of the abutting part 22, so that under force, the acting force is concentrated on the outermost ends, and the battery cell can be pressed more effectively. 2. Since the V-shaped opening of the deformation part 21 faces the other end of the length away from the insulating body 1 and the V-shaped tip faces the other end of the length of the insulating body 1, the deformation part 21 is located directly below the insulating body 1, making the structure more compact. When the V-shaped deformation part 21 deforms, the V-shaped tip extends towards the other end of the length of the insulating body 1, and this direction is below the insulating body 1, which is an empty space, effectively utilizing the space below the insulating body 1 and making the space utilization rate higher. 3. The other end of the abutting part 22 extends towards the other end of the length of the insulating body 1, so that the area where the abutting part 22 abuts on the battery cell is larger, and the bending moment resistance ability of the abutting part 22 is stronger, making the abutting more stable.

[0057] Preferably, in this embodiment, the elastic abutting member 2 is integrally formed on the insulating body 1, and the abutting part 22 and the deformation part 21 are integrally formed, so that the insulating member is completed by injection molding, with convenient processing, better connection strength, and lower production cost.

[0058] Preferably, the number of the elastic abutting members 2 in this embodiment is two, and they are respectively arranged at both ends of the length of the insulating body 1, so as to improve the stability of the battery cell positioning by abutting the left and right ends of the battery cell with the two elastic abutting members 2.

[0059] Preferably, the insulating body 1 in this embodiment includes a first insulating member 11 on the left side and a second insulating member 12 on the right side, and a partition area 13 is arranged between the first insulating member 11 and the second insulating member 12; one of the elastic abutting members 2 is arranged at the left end of the first insulating member 11, and the other elastic abutting member 2 is arranged at the right end of the second insulating member 12.

[0060] Therefore, 1. The arrangement of the separated first insulating member 11 and second insulating member 12 enables the first insulating member 11 and the second insulating member 12 to be installed according to their own structural settings, and the positioning structural relationship between the two will not interfere with each other, ensuring the smoothness of assembly. 2. The setting of the partition area 13 keeps a space between the first insulating member 11 and the second insulating member 12 for adjustment during installation. 3. The two elastic abutting members 2 are respectively arranged on the first insulating member 11 and the second insulating member 12, so that each elastic abutting member 2 abuts on the battery cell respectively, which not only has a stable positioning effect on the battery cell by abutting, but also has a positioning effect on both the first insulating member 11 and the second insulating member 12 by abutting.

[0061] Preferably, the thickness of the deformation part 21 in this embodiment is s1, and 1mm ≤ s1 ≤ 3mm; the thickness of the abutting part 22 is s2, and 5mm ≤ s2 ≤ 10mm. Appropriate settings of s1 and s2 are made to ensure stable abutting and smooth deformation.

[0062] Example Two:

[0063] As Figure 6 shown, an insulating member that is telescopic in the thickness direction has the same main structure as that in Example One. The difference is that the inclined body 211 is not provided. Correspondingly, the deformation part 21 is inclined. One end of the deformation part 21 that inclines upward is integrally formed at one end of the length of the insulating body 1, and one end of the deformation part 21 that inclines downward is integrally formed and connected to one end of the abutting part 22, and the other end of the abutting part 22 extends along the length direction of the insulating body 1 away from the other end of the insulating body 1.

[0064] Example Three:

[0065] As Figure 7 shown, an insulating member that is telescopic in the thickness direction has the same main structure as that in Example One. The difference is that the number of the inclined bodies 211 is 6, so that the deformation part 21 is in a wavy shape.

[0066] In other embodiments, the number of the inclined bodies 211 can be 3, so that the deformation part 21 is in an N shape.

[0067] In other embodiments, the number of the inclined bodies 211 can be 4, so that the deformation part 21 is in an M shape.

[0068] Example Four:

[0069] As Figure 8 shown, an insulating member that is telescopic in the thickness direction has the same main structure as that in Example One. The difference is that the elastic abutting member 2 is fixedly installed on the insulating body 1 by means of snap connection and then using bolts, so as to realize the detachable connection between the elastic abutting member 2 and the insulating body 1.

[0070] Example Five:

[0071] Combined with Figures 9-13 shown, the present utility model discloses a battery top cover, which includes a top cover sheet 3, the insulating member according to any one of Example One to Example Four, a negative electrode assembly 4, and a positive electrode assembly 5. Among them, the insulating member is located on the lower side of the top cover sheet 3. The negative electrode assembly 4 is respectively connected to the top cover sheet 3 and the first insulating member 11, and the positive electrode assembly 5 is respectively connected to the top cover sheet 3 and the second insulating member 12.

[0072] Among them, a first mounting hole 31 is provided on the left side of the top cover sheet 3, a second mounting hole 32 is provided on the right side, a third mounting hole 111 is provided on the first insulating member 11, a fourth mounting hole 121 is provided on the second insulating member 12. The negative electrode assembly 4 is installed through the first mounting hole 31 and the third mounting hole 111, and the positive electrode assembly 5 is installed through the second mounting hole 32 and the fourth mounting hole 121.

[0073] Specifically, the negative electrode assembly 4 includes a first mounting seat 41, a second mounting seat 42, a negative electrode member 43, a first seal 44, and two first connection posts 45. The first mounting seat 41 is located above the first mounting hole 31, and the second mounting seat 42 is located above the first mounting seat 41. Two first jacks 33 are provided on the upper side of the top cover plate 3, and two vertically penetrating second jacks 411 are provided on the first mounting seat 41. Two third jacks 421 are provided on the lower side of the second mounting seat 42, so that the first mounting seat 41, the second mounting seat 42, and the top cover plate 3 are installed by interference fitting the two first connection posts 45 with the first jack 33, the second jack 411, and the third jack 421 respectively. The first seal 44 is sleeved on the outer periphery of the negative electrode member 43 and passes through the third mounting hole 111, the first mounting hole 31, the first mounting seat 41, and the second mounting seat 42 upward from below the third mounting hole 111 with the negative electrode member 43 and is snap-fitted with the second mounting seat 42. Moreover, the first seal 44 is of a three-section structure, and the three-section first seal 44 abuts against the first insulating member 11, the top cover plate 3, and the first mounting seat 41 respectively to achieve three-section sealing.

[0074] Specifically, the positive electrode assembly 5 includes a third mounting seat 51, a fourth mounting seat 52, a positive electrode member 53, a second seal 54, and two second connection posts 55. The third mounting seat 51 is located above the second mounting hole 32, and the fourth mounting seat 52 is located above the third mounting seat 51. Two fourth jacks 34 are provided on the upper side of the top cover plate 3, and two vertically penetrating fifth jacks 511 are provided on the third mounting seat 51. Two sixth jacks 521 are provided on the lower side of the fourth mounting seat 52, so that the third mounting seat 51, the fourth mounting seat 52, and the top cover plate 3 are installed by interference fitting the two second connection posts 55 with the fourth jack 34, the fifth jack 511, and the sixth jack 521 respectively. The second seal 54 is sleeved on the outer periphery of the positive electrode member 53 and passes through the fourth mounting hole 121, the second mounting hole 32, the third mounting seat 51, and the fourth mounting seat 52 upward from below the fourth mounting hole 121 with the positive electrode member 53 and is snap-fitted with the fourth mounting seat 52. Moreover, the second seal 54 is of a three-section structure, and the three-section second seal 54 abuts against the second insulating member 12, the top cover plate 3, and the third mounting seat 51 respectively to achieve three-section sealing.

[0075] Among them, a fifth mounting hole 35 is formed in the middle of the top cover plate 3 in this embodiment. An explosion-proof valve 61 is provided in the fifth mounting hole 35 by means of snap connection, bonding, etc., and a film 62 is provided on the upper side of the fifth mounting hole 35 to seal the fifth mounting hole 35.

[0076] In addition, a first mounting groove 112 is provided below the right side of the first insulating member 11 and below the explosion-proof valve 61, and a second mounting groove 122 is provided below the left side of the second insulating member 12 and below the explosion-proof valve 61. The first mounting groove 112 and the second mounting groove 122 are separated by a partition area 13. A first exhaust hole 113 is provided on the bottom wall of the first mounting groove 112, and a second exhaust hole 123 is provided on the bottom wall of the second mounting groove 122, so that the explosion-proof valve 61 and the lower part of the insulating member are communicated through the first exhaust hole 113, the second exhaust hole 123, the first mounting groove 112, and the second mounting groove 122. In the battery assembly state, the explosion-proof valve 61 prevents the risk of battery explosion due to excessive internal pressure, and the film 62 protects the explosion-proof valve 61 and prevents the explosion-proof valve 61 from being contacted by the outside world.

[0077] Preferably, the right side of the first mounting groove 112 and the left side of the second mounting groove 122 are both open, so that the first mounting groove 112 and the second mounting groove 122 are communicated through the partition area 13 to maintain the same pressure. In addition, a first bottom surface 14 is provided below the second mounting groove 122 of the second insulating member 12, and the horizontal position of the bottom wall of the first mounting groove 112 is lower than the horizontal position of the first bottom surface 14, so that better communication between the first mounting groove 112, the second mounting groove 122 and the lower space is achieved through the height difference, and the explosion-proof valve 61 can be opened in time when the internal pressure of the battery is too high.

[0078] Among them, a first rib 114 is provided in the first mounting groove 112, and the first rib 114 connects the bottom wall of the first mounting groove 112 and the side wall of the first mounting groove 112. A second rib 124 is provided in the second mounting groove 122, and the second rib 124 connects the bottom wall of the second mounting groove 122 and the side wall of the second mounting groove 122.

[0079] Therefore, under the action of the first rib 114 and the second rib 124, the first insulating member 11 and the second insulating member 12 have greater strength at the first mounting groove 112 and the second mounting groove 122, so that they are not easily deformed to cause the explosion-proof valve 61 and the lower space of the insulating member to be in contact and blocked, thereby affecting the effective protection function of the explosion-proof valve 61.

[0080] In addition, a first liquid injection hole 36 is provided on the top cover piece 3 in this embodiment, and a second liquid injection hole 15 is provided below the first liquid injection hole 36 of the second insulating member 12, so that in the battery assembly state, the electrolyte can be injected into the battery through the first liquid injection hole 36 and the second liquid injection hole 15.

[0081] Among them, two top convex parts 16 are protrudingly provided below the second liquid injection hole 15 of the second insulating member 12, and the two top convex parts 16 are located on the left and right sides of the second liquid injection hole 15, so that the injected electrolyte can enter the battery more smoothly through the top convex parts 16, and the blockage of the second liquid injection hole 15 causing unsmooth liquid injection is prevented.

[0082] Embodiment Six:

[0083] The present utility model discloses a battery, which comprises a battery housing, an electric core, and the battery top cover described in Embodiment Five. The electric core is located inside the battery housing, and the battery top cover is installed at the upper end of the battery housing to seal the electric core inside the battery housing. In addition, the abutting portion 22 on the first insulating member 11 abuts against the electric core downward on the left side of the electric core, and the deformation of the deformation portion 21 on the first insulating member 11 ensures that the abutting portion 22 stably presses the electric core downward. Similarly, the abutting portion 22 on the second insulating member 12 abuts against the electric core downward on the right side of the electric core, and the deformation of the deformation portion 21 on the second insulating member 12 ensures that the abutting portion 22 stably presses the electric core downward.

[0084] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An insulating member that is retractable in thickness direction, characterized in that: It comprises an insulating body (1), wherein a resilient abutment member (2) is provided on one side of the thickness of the insulating body (1); The elastic abutment member (2) comprises a deformation portion (21) and an abutment portion (22); the deformation portion (21) is used to connect the insulating body (1) and the abutment portion (22); when the abutment portion (22) is subjected to pressure, the deformation portion (21) bends and deforms so that the abutment portion (22) is close to the insulating body (1).

2. The insulating member that can be expanded and contracted in thickness direction according to claim 1, characterized in that: The deformation portion (21) is arranged in an inclined manner, one inclined end of the deformation portion (21) is connected to the insulating body (1), and the other inclined end of the deformation portion (21) is connected to the abutment portion (22); or, The deformation portion (21) comprises at least two inclined bodies (211) connected end to end so that the deformation portion (21) is V-shaped, N-shaped, M-shaped or wavy-shaped; one end of the deformation portion (21) is connected to the insulating body (1); and the other inclined end of the deformation portion (21) is connected to the abutment portion (22).

3. The insulating member that can be expanded and contracted in thickness direction according to claim 2, characterized in that: The number of the inclined bodies (211) is two so that the deformation portion (21) is V-shaped; One end of the V-shape of the deformation portion (21) is connected to one end of the length of the insulation body (1), the other end of the V-shape of the deformation portion (21) is connected to one end of the abutment portion (22), and the V-shaped opening of the deformation portion (21) is along the length direction of the insulation body (1) toward the other end away from the insulation body (1); The other end of the abutting portion (22) faces the other end of the insulating body (1) along the length direction of the insulating body (1).

4. The insulating member that can be expanded and contracted in thickness direction according to claim 1, characterized in that: The elastic contact member (2) is integrally formed with the insulating body (1); or, The elastic contact piece (2) is detachably arranged on the insulating body (1).

5. The insulating member that is retractable in thickness direction according to any one of claims 1 to 4, characterized in that: The number of the elastic abutment members (2) is two, and they are respectively arranged at two ends of the length of the insulating body (1).

6. The insulating member that can be expanded and contracted in the thickness direction according to claim 5, characterized in that: The insulating body (1) comprises a first insulating member (11) and a second insulating member (12), wherein a separation area (13) is provided between the first insulating member (11) and the second insulating member (12); One of the elastic abutting members (2) is arranged at one end of the first insulating member (11) away from the second insulating member (12), and the other elastic abutting member (2) is arranged at one end of the second insulating member (12) away from the first insulating member (11).

7. The insulating member that can be expanded and contracted in thickness direction according to claim 1, characterized in that: The thickness of the deformation portion (21) is s1, 1mm≤s1≤3mm; and / or, The thickness of the abutting portion (22) is s2, 5mm≤s2≤10mm.

8. A battery top cover, characterized in that: It comprises a top cover sheet (3), an insulating member as claimed in any one of claims 1 to 7, a negative electrode assembly (4) and a positive electrode assembly (5); The insulating member is located on the lower side of the top cover sheet (3), the negative electrode assembly (4) is respectively connected to the top cover sheet (3) and the insulating member, and the positive electrode assembly (5) is respectively connected to the top cover sheet (3) and the insulating member.

9. The battery top cover according to claim 8, characterized in that: The top cover sheet (3) is provided with a first mounting hole (31) and a second mounting hole (32), the insulating body (1) is provided with a third mounting hole (111) and a fourth mounting hole (121), the negative electrode assembly (4) is installed through the first mounting hole (31) and the third mounting hole (111), and the positive electrode assembly (5) is installed through the second mounting hole (32) and the fourth mounting hole (121); A fifth mounting hole (35) is provided on the top cover sheet (3), an explosion-proof valve (61) is provided in the fifth mounting hole (35), a film (62) is provided on the upper side of the fifth mounting hole (35) to close the fifth mounting hole (35), a first mounting groove (112) and a second mounting groove (122) are provided on the insulating body (1) below the explosion-proof valve (61), and the first mounting groove (112) and the second mounting groove (122) are separated, a first exhaust hole (113) is provided on the bottom wall of the first mounting groove (112), a second exhaust hole (123) is provided on the bottom wall of the second mounting groove (122), a first rib (114) is provided in the first mounting groove (112), The first rib (114) connects the bottom wall of the first mounting groove (112) and the side wall of the first mounting groove (112); a second rib (124) is arranged in the second mounting groove (122); the second rib (124) connects the bottom wall of the second mounting groove (122) and the side wall of the second mounting groove (122); a side of the first mounting groove (112) facing the second mounting groove (122) and a side of the second mounting groove (122) facing the first mounting groove (112) are both open; the insulating body (1) is provided with a first bottom surface (14) below the second mounting groove (122); the horizontal position of the bottom wall of the first mounting groove (112) is lower than the horizontal position of the first bottom surface (14); The top cover sheet (3) is provided with a first liquid injection hole (36), the insulating body (1) is provided with a second liquid injection hole (15) below the first liquid injection hole (36), and the insulating body (1) is provided with a plurality of top protrusions (16) protruding below the second liquid injection hole (15), and the top protrusions (16) are arranged along the circumferential spacing of the second liquid injection hole (15).

10. A battery, characterized in that: The battery comprises a battery casing, a battery cell and a battery top cover as claimed in any one of claims 8 to 9, wherein the battery cell is located in the battery casing, the battery top cover is used to seal the battery cell in the battery casing, and the abutting portion (22) abuts against the battery cell downward.

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