Battery end cover structure and battery

By introducing high temperature -resistant insulation support parts in the lithium -ion battery end cover structure to form an exhaust channel, the problem of lithium -ion battery blocked the explosion -proceed valve when the lithium -ion battery is used to block the explosion -proof valve, and the battery safety performance is improved.

CN222422123UActive Publication Date: 2025-01-28SVOLT ENERGY TECHNOLOGY CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202323271122.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-11-30
Publication Date
2025-01-28
Estimated Expiration
2033-11-30

AI Technical Summary

Technical Problem

When a lithium-ion battery has thermal runaway, the plastic end plate may melt, causing the pole group to block the explosion-proof valve, increasing the risk of the battery to lose control.

Method used

A battery end cover structure is designed, including cover, plastic end plates, connecting pieces and insulation support parts. The insulation support is made of high -temperature resistance and is located between the cover and the pole group to form an exhaust channel to prevent the polar group from blocking the explosion -proof valve.

Benefits of technology

When the battery heat is out of control, the insulation support parts are between the cover and the pole group, forming an exhaust channel to prevent the polar group from blocking the explosion -proof valve, alleviating the unfavorable consequences of battery thermal out of control, and increasing the safety performance of the battery.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222422123U_ABST
    Figure CN222422123U_ABST
Patent Text Reader

Abstract

The utility model relates to the technical field of power batteries, and particularly discloses a battery end cover structure and a battery. Wherein the battery end cover structure covers an opening of a battery shell, a pole group is arranged in the battery shell, and a pole lug is arranged on one side, facing the opening of the battery shell, of the pole group. The battery end cover structure comprises a cover plate, a plastic end plate, a connecting piece and an insulating supporting piece, wherein the cover plate is provided with an anti-explosion valve and a pole; the plastic end plate is connected with the cover plate; the connecting sheet is arranged between the tab and the pole, and the connecting sheet is electrically connected with the tab and the pole; the insulating support piece is resistant to high temperature and electrolyte, and is arranged between the connecting sheet and the tab. The insulating supporting piece is suitable for being connected between the cover plate and the pole group in an abutting mode under the condition that the plastic end plate is melted due to thermal runaway of the battery, so that an exhaust channel communicated with the ventilation opening of the anti-explosion valve is formed between the cover plate and the pole group. According to the scheme, the pole group is prevented from blocking the explosion-proof valve under the impact extrusion of airflow, adverse consequences caused by thermal runaway of the battery are relieved, and the safety performance of the battery is improved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery end cover structure and a battery. Background Art

[0002] At present, with the increasing maturity of lithium-ion battery technology, lithium-ion batteries have been widely used as power batteries in the field of electric vehicles. Therefore, people's requirements for the safety performance of lithium-ion batteries are increasing.

[0003] In the traditional lithium-ion battery structure, the cover plate and the shell are welded to encapsulate the electrode group inside the shell; the plastic end plate of the cover plate is against the electrode group, which plays the role of limiting the electrode group. However, when the battery has thermal runaway, the internal temperature of the battery increases, and the gas generation increases, causing the explosion-proof valve to automatically open for exhaust; at this time, the plastic end plate may melt at high temperature, thereby losing the limiting effect on the electrode group, and the electrode group may block the explosion-proof valve under the impact of the airflow, aggravating the battery runaway and posing a greater safety risk. Utility Model Content

[0004] In view of this, the utility model provides a battery end cover structure and a battery to solve the existing problem that when thermal runaway occurs in the battery, the pole group may block the explosion-proof valve under the impact of airflow, aggravating the battery runaway and posing a greater safety risk.

[0005] In the first aspect, the utility model provides a battery end cover structure. Specifically, the battery end cover structure is covered on the opening of the battery shell, and a pole group is provided inside the battery shell, and a pole ear is provided on the side of the pole group facing the opening of the battery shell. The battery end cover structure includes a cover plate, a plastic end plate, a connecting piece and an insulating support; wherein the cover plate is provided with an explosion-proof valve and a pole column; the plastic end plate is connected to the cover plate; the connecting piece is provided between the pole ear and the pole column, and the connecting piece electrically connects the pole ear and the pole column; the insulating support is resistant to high temperature and electrolyte, and the insulating support is provided between the connecting piece and the pole ear.

[0006] In an optional embodiment, the insulating support member includes two support plates, and the two support plates are arranged at corners.

[0007] In an optional embodiment, the support sheet is arranged to fit the inclined surface of the tab.

[0008] In an optional embodiment, the support sheet is provided with a limiting hole, and the limiting hole is sleeved on the flange of the pole ear.

[0009] In an optional embodiment, the limiting hole is a strip-shaped hole, the width of the limiting hole is greater than the thickness of the flange, and the length of the limiting hole is greater than the width of the flange.

[0010] In an optional embodiment, the two support sheets are separately provided, and there is a gap between the two support sheets.

[0011] In an optional embodiment, the gap between the two supporting sheets is not less than 3 mm.

[0012] In an optional embodiment, the length of the supporting sheet is greater than the length of the flange.

[0013] In an optional embodiment, the thickness of the supporting sheet is not less than 3 mm.

[0014] In a second aspect, the utility model further provides a battery, comprising a battery housing, a pole group disposed inside the battery housing, and a battery end cover structure, wherein the battery end cover structure covers an opening of the battery housing.

[0015] Beneficial effects: In the battery end cap structure of the first aspect, an insulating support is added between the cover plate and the plastic end plate. When the plastic end plate melts due to thermal runaway of the battery, the insulating support abuts between the cover plate and the pole group, so that an exhaust channel connected to the air vent of the explosion-proof valve is formed between the cover plate and the pole group, preventing the pole group from blocking the explosion-proof valve under the impact of the air flow, alleviating the adverse consequences of thermal runaway of the battery, and increasing the safety performance of the battery. In addition, the battery of the second aspect includes the battery end cap structure of the first aspect, so the battery of the second aspect has all the beneficial effects of the battery end cap structure of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 An exploded diagram of a battery according to an embodiment of the utility model;

[0018] Figure 2 A front view of a battery according to an embodiment of the utility model;

[0019] Figure 3 for Figure 2 Cross-sectional view at AA in the middle;

[0020] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0021] Description of reference numerals:

[0022] 100. Battery;

[0023] 110. Battery end cover structure; 120. Battery housing; 130. Electrode group;

[0024] 111. Cover plate; 112. Plastic end plate; 113. Insulating support member; 114. Connecting piece;

[0025] 1111, explosion-proof valve; 1112, pole;

[0026] 1131. support sheet; 1132. limiting hole;

[0027] 1141, split ends;

[0028] 131. Extreme ear;

[0029] 1311. Bevel; 1312. Flanged edge. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0031] In order to deepen the understanding of the solution of the utility model, it is necessary to elaborate on the technical problems in detail in combination with relevant technologies. The specific contents are as follows:

[0032] In the traditional lithium-ion battery structure, the cover plate and the shell are welded to encapsulate the electrode group inside the shell; the plastic end plate of the cover plate is against the electrode group, which plays the role of limiting the electrode group. However, when the battery has thermal runaway, the internal temperature of the battery increases, and the gas generation increases, causing the explosion-proof valve to automatically open for exhaust; at this time, the plastic end plate may melt at high temperature, thereby losing the limiting effect on the electrode group, and the electrode group may block the explosion-proof valve under the impact of the airflow, aggravating the battery runaway and posing a greater safety risk.

[0033] Furthermore, batteries generally control their temperature through a dedicated temperature control circuit. When the temperature control circuit fails, the battery may suffer thermal runaway, intensifying the chemical reaction inside the battery and generating more gas. If the high temperature melts the plastic end plate at this time and the electrode group blocks the vent of the explosion-proof valve, the battery is in danger of exploding.

[0034] In order to alleviate the above technical problems, the utility model provides a battery end cover structure and a battery. Figures 1 to 4 The embodiments of the present utility model are described in detail.

[0035] First, refer to Figure 1 and Figure 4 The utility model provides a battery end cover structure 110. Specifically, the battery end cover structure 110 is covered on the opening of the battery housing 120, and a pole group 130 is provided inside the battery housing 120, and a pole ear 131 is provided on the side of the pole group 130 facing the opening of the battery housing 120. The battery end cover structure 110 includes a cover plate 111, a plastic end plate 112, a connecting piece 114 and an insulating support 113; wherein the cover plate 111 is provided with an explosion-proof valve 1111 and a pole column 1112; the plastic end plate 112 is connected to the cover plate 111; the connecting piece 114 is provided between the pole ear 131 and the pole column 1112, and the connecting piece 114 electrically connects the pole ear 131 and the pole column 1112; the insulating support 113 is resistant to high temperature and electrolyte, and the insulating support 113 is provided between the connecting piece 114 and the pole ear 131.

[0036] Specifically, an insulating support member 113 is additionally provided between the cover plate 111 and the plastic end plate 112. When the plastic end plate 112 melts due to thermal runaway of the battery 100, the insulating support member 113 abuts against between the cover plate 111 and the electrode group 130, so that an exhaust passage connected to the air vent of the explosion-proof valve 1111 is formed between the cover plate 111 and the electrode group 130, thereby preventing the electrode group 130 from clogging the explosion-proof valve 1111 under the impact of airflow, alleviating the adverse consequences brought about by thermal runaway of the battery 100, and increasing the safety performance of the battery 100.

[0037] It should be noted that the insulating support 113 is resistant to high temperatures and electrolyte corrosion. When the plastic end plate 112 melts due to thermal runaway of the battery 100, the insulating support 113 will not melt and will not be corroded by electrolysis, thereby supporting the electrode group 130 and the cover plate 111. In addition, the insulating support 113 is made of insulating material and will not electrically connect the electrode ear 131 to other components to prevent short circuits.

[0038] Particularly, the insulating support member 113 is made of rubber, ceramic, mica sheet, etc. Preferably, the insulating support member 113 is made of fluororubber.

[0039] In some embodiments, reference Figure 1 and Figure 4 The insulating support member 113 includes two support pieces 1131, and the two support pieces 1131 are arranged at corners.

[0040] Specifically, this solution is a specific implementation of the insulating support member 113. The insulating support member 113 includes two support pieces 1131. The two support pieces 1131 are arranged at corners to form a stable triangular support structure.

[0041] More specifically, the pole group 130 has two positive and negative pole ears 131, each pole ear 131 includes two parts, the bottoms of the two parts have opposite inclined surfaces 1311, and form an inverted "eight" shape, the top of each inclined surface 1311 has a flange 1312, and the flange 1312 preferably extends along the end surface direction of the pole group 130, and the two flanges 1312 are close to each other; one end of the connecting piece 114 is a forked end 1141, and the two forks of the forked end 1141 are respectively welded to the two flanges 1312 of the pole ear 131, and the other end of the connecting piece 114 is welded to the pole 1112; the two support sheets 1131 of the insulating support member 113 are similar to the extension direction of the inclined surface 1311 of the pole ear 131, the corners of the two support sheets 1131 face the pole group 130, and the openings of the two support sheets 1131 face the cover plate 111.

[0042] In particular, the insulating support member 113 is placed flat between the two inclined surfaces 1311 of the pole ear 131, which can also achieve the purpose of supporting the pole group 130 and the cover plate 111, and also falls within the protection scope of this patent.

[0043] In some embodiments, reference Figure 1 and Figure 4 The support sheet 1131 is disposed in close contact with the inclined surface 1311 of the tab 131 .

[0044] Specifically, the support sheet 1131 is disposed in close contact with the inclined surface 1311 of the tab 131 , preferably by bonding, so that the connection is more secure.

[0045] More specifically, the adhesive between the support sheet 1131 and the tab 131 is resistant to electrolyte, and the thickness of the adhesive layer is not less than 15 microns to ensure the bonding strength; preferably, the adhesive is an acrylic pressure-sensitive adhesive.

[0046] In some embodiments, reference Figure 1 and Figure 4 The support sheet 1131 defines a limiting hole 1132 , and the limiting hole 1132 is sleeved on the flange 1312 of the pole ear 131 .

[0047] Specifically, the support sheet 1131 is provided with a limiting hole 1132, and the limiting hole 1132 is sleeved on the flange 1312 of the pole ear 131 to increase the firmness of the connection. After the battery 100 thermal runaway causes the plastic end plate 112 to melt, the support sheet 1131 will not be squeezed by the airflow and run away.

[0048] In addition, the support sheet 1131 is sleeved on the flange 1312 of the pole ear 131, and the bending state of the flange 1312 of the pole ear 131 is shaped to prevent the pole ear 131 from being damaged, and to avoid the pole ear 131 being pulled due to poor retraction and bending effect, or being inserted upside down into the pole piece of the pole group 130 to cause thermal runaway.

[0049] In some embodiments, reference Figure 1 and Figure 4 The limiting hole 1132 is a strip-shaped hole, the width of the limiting hole 1132 is greater than the thickness of the flange 1312 , and the length of the limiting hole 1132 is greater than the width of the flange 1312 .

[0050] Specifically, the width of the limiting hole 1132 is greater than the thickness of the flange 1312 , and the length of the limiting hole 1132 is greater than the width of the flange 1312 , so that the support sheet 1131 is conveniently sleeved on the flange 1312 of the tab 131 , and the operation is convenient.

[0051] In some embodiments, reference Figure 1 and Figure 4 The two support sheets 1131 are separately arranged, and there is a gap between the two support sheets 1131 .

[0052] Specifically, the two support sheets 1131 are separately provided, and there is a gap between the two support sheets 1131 , which has a simple structure, is convenient to manufacture, and saves materials.

[0053] In particular, the two supporting sheets 1131 are integrally arranged, which can also achieve the purpose of supporting the electrode group 130 and the cover plate 111, and also falls within the protection scope of this patent.

[0054] In some embodiments, reference Figure 1 and Figure 4 , the gap between the two supporting sheets 1131 is not less than 3 mm.

[0055] Specifically, the gap between the two support sheets 1131 is not less than 3 mm to prevent collision and damage from falling.

[0056] In some embodiments, reference Figure 1 and Figure 4 , the length of the supporting piece 1131 is greater than the length of the flange 1312 .

[0057] Specifically, the length of the support sheet 1131 is greater than the length of the flange 1312. More specifically, the length of the support sheet 1131 projected in the extension direction of the flange 1312 is greater than the length of the flange 1312, which can prevent the inclined surface 1311 of the pole ear 131 from being damaged by the flange 1312 of the pole ear 131.

[0058] In some embodiments, reference Figure 1 and Figure 4 , the thickness of the supporting sheet 1131 is not less than 3 mm.

[0059] Specifically, the thickness of the support sheet 1131 is not less than 3 mm, so as to ensure the strength of the support sheet 1131 and achieve the effect of supporting the electrode group 130 and the cover plate 111 .

[0060] Secondly, refer to Figure 2and Figure 3 The utility model further provides a battery 100 , including a battery housing 120 , an electrode group 130 disposed inside the battery housing 120 , and a battery end cover structure 110 , wherein the battery end cover structure 110 covers an opening of the battery housing 120 .

[0061] Specifically, the battery 100 in this solution includes a battery end cover structure 110, so the battery 100 has all the beneficial effects of the battery end cover structure 110. In addition, the battery 100 in this solution also includes other components such as a battery protection plate, and only the components related to this solution are listed here, but the composition of the battery 100 is not limited.

[0062] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery end cover structure, which covers the opening of a battery housing, wherein a pole group is arranged inside the battery housing, and a pole ear is arranged on the side of the pole group facing the opening of the battery housing, characterized in that: The battery end cover structure comprises: A cover plate, wherein the cover plate is provided with an explosion-proof valve and a pole; A plastic end plate connected to the cover plate; A connecting piece, the connecting piece is arranged between the pole lug and the pole, and the connecting piece electrically connects the pole lug and the pole; An insulating support member, wherein the insulating support member is resistant to high temperature and electrolyte, and the insulating support member is arranged between the connecting piece and the pole ear.

2. The battery end cover structure according to claim 1, characterized in that: The insulating support member includes two support plates, and the two support plates are arranged at corners.

3. The battery end cover structure according to claim 2, characterized in that: The support sheet is arranged in contact with the inclined surface of the pole ear.

4. The battery end cover structure according to claim 2, characterized in that: The support sheet is provided with a limiting hole, and the limiting hole is sleeved on the flange of the pole ear.

5. The battery end cover structure according to claim 4, characterized in that: The limiting hole is a strip-shaped hole, the width of the limiting hole is greater than the thickness of the flange, and the length of the limiting hole is greater than the width of the flange.

6. The battery end cover structure according to claim 2, characterized in that: The two support sheets are separately arranged, and there is a gap between the two support sheets.

7. The battery end cover structure according to claim 6, characterized in that: The gap between the two support sheets is not less than 3 mm.

8. The battery end cover structure according to claim 4, characterized in that: The length of the supporting sheet is greater than the length of the flange.

9. The battery end cover structure according to any one of claims 2 to 8, characterized in that: The thickness of the support sheet is not less than 3 mm.

10. A battery, characterized in that: The invention comprises a battery shell, a pole group arranged inside the battery shell, and a battery end cover structure according to any one of claims 1 to 9, wherein the battery end cover structure covers an opening of the battery shell.