Cover plate assembly, battery and battery module

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate assembly, a battery and a battery module, the cover plate assembly comprises a cover plate, a lower insulating part and a support part, a guide part is arranged at a notch of a containing groove or on one side, facing the containing groove, of the support part during installation, and the support part is suitable for sliding into the containing groove through the guide part. The cover plate assembly with the structure is applied to the battery, and when the battery is in thermal runaway, the supporting piece is supported between the pole group and the cover plate, so that the pressure relief mechanism is normally started for exhausting, the battery is prevented from exploding, and the safety performance of the battery is improved. In order to solve the problem that the supporting piece is inconvenient to install due to the fact that the supporting piece is stably kept in the containing groove and the supporting piece is in interference fit with the containing groove, a guiding piece is arranged at a groove opening of the containing groove or the side, facing the containing groove, of the supporting piece in the installation process, and the supporting piece slides into the containing groove along the guiding piece in the installation process. The supporting piece can be conveniently and rapidly installed in the containing groove.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a cover plate assembly, a battery and a battery module. Background Art

[0002] Lithium-ion batteries include cover, shell, pole group, end plate, side plate, bare cell insulation sheet, pole group, electrolyte and other components. The cover is integrated with an explosion-proof valve, and the side plate, bare cell insulation sheet, end plate and lower plastic constitute the insulation protection structure of the pole group, so that the battery cell can avoid short circuit and other problems caused by overlapping the pole group with the shell or cover during normal use.

[0003] The insulating protection structures of the electrode group are all made of plastic and have poor high temperature resistance. When the battery is in thermal runaway, its internal temperature rises rapidly, and the insulating protection structures such as the side panels, bare cell insulation sheets, end panels, and lower plastic will quickly melt and fail. At this time, there is only the electrode group inside the shell, and there is no obstruction between the electrode group and the cover. Under the action of high temperature and high pressure gas inside the shell, the electrode group will lose balance. Because the pressure at the explosion-proof valve of the cover is relatively low, the electrode group can easily move toward the explosion-proof valve, thereby blocking the explosion-proof valve and making it unable to open. The explosion-proof valve cannot be opened effectively, and the battery is at risk of explosion, greatly reducing its safety. Utility Model Content

[0004] In view of this, the utility model provides a cover plate assembly, a battery and a battery module to solve the problem in the prior art that the electrode group of the battery easily blocks or obstructs the pressure relief mechanism.

[0005] In a first aspect, the utility model provides a cover plate assembly, comprising:

[0006] a cover plate, on which a pressure relief mechanism is provided;

[0007] A lower insulating member, fixedly connected to the inner side wall of the cover plate, and provided with a receiving groove;

[0008] The support member is made of a high temperature resistant and electrolyte resistant material. The support member is interference fit in the receiving groove. A guide member is provided at the notch of the receiving groove or on the side of the support member facing the receiving groove during installation. The support member is suitable for sliding into the receiving groove through the guide member.

[0009] Beneficial effects: The cover plate assembly of this structure is used in the battery. The cover plate assembly is arranged on the opening of the battery shell, and the support member is located between the pole group and the cover plate. When the battery is in thermal runaway, the temperature inside the battery shell rises rapidly. After the lower insulating member melts, the pole group moves toward the cover plate under the action of the high-temperature and high-pressure airflow. Since the support member is resistant to high temperatures, the support member can still be supported between the pole group and the cover plate, preventing the pole group from being close to the cover plate and blocking or blocking the pressure relief mechanism, ensuring that the pressure relief mechanism is normally opened for exhaust, preventing battery explosion, and improving the safety performance of the battery. At the same time, in order to keep the support member stably in the receiving groove, the support member and the receiving groove have an interference fit, which makes the support member inconvenient to install. In order to solve this problem, the utility model provides a guide member at the notch of the receiving groove or on the side of the supporting member facing the receiving groove when installing. When installing the supporting member, the supporting member slides into the receiving groove along the guide member, so as to conveniently and quickly install the supporting member into the receiving groove.

[0010] In an optional embodiment, the guide member includes a guide slope arranged at a notch of the accommodating groove.

[0011] Beneficial effect: When installing the support member, it can be conveniently and quickly loaded into the receiving groove along the guide slope.

[0012] In an optional embodiment, the inner wall of the accommodating groove is protrudingly provided with a strip-shaped rib portion, the outer end surface of the rib portion extends to the entrance of the accommodating groove, the support member is interference fit with the rib portion, and the guide member is arranged on the outer end surface of the rib portion.

[0013] Beneficial effect: the support member and the rib portion are interference fit, and the rib portion has a small area, which is convenient for extrusion and deformation to be embedded in the support member.

[0014] In an optional embodiment, a plurality of the rib portions are spaced apart on the inner wall of the accommodating groove, the rib portions are vertically arranged along the groove depth direction of the accommodating groove, and the outer end surface of each of the rib portions is provided with the guide member.

[0015] Beneficial effect: A plurality of ribs are arranged at intervals on the inner wall of the receiving groove, so that the support member can be stably maintained in the receiving groove.

[0016] In an optional embodiment, a guide groove is provided at a position corresponding to the support member and at least one of the rib portions, the guide groove is wrapped around the rib portion arranged opposite thereto, and at least one of the multiple rib portions is interference fit with the outer wall of the support member.

[0017] Beneficial effect: When the support is installed, it first slides into the rib part along the guide slope, and the guide groove then slides down along the rib part to the bottom of the accommodating groove. The rib part cooperating with the guide groove also plays a guiding role, which facilitates the installation of the support in place.

[0018] In an optional embodiment, the receiving groove is in the shape of a rectangular groove, and the inner wall of each receiving groove is provided with at least two rib portions.

[0019] Beneficial effect: The inner wall of each receiving groove is provided with at least two rib parts, so that the support member is tightly fitted on each inner wall of the receiving groove.

[0020] In an optional embodiment, the thickness of the rib portion protruding from the inner wall of the accommodating groove is A, the width of the rib portion extending laterally along the groove edge of the accommodating groove is B, and the depth of the rib portion extending along the groove depth direction of the accommodating groove is H, 0.3mm≤A≤2mm, 0.5≤B≤3mm, H≥5mm.

[0021] Beneficial effect: To prevent the rib portion from being too small to ensure the interference fit, the thickness of the rib portion A is ≤ 2 mm, to prevent the thickness from being too thick to make it inconvenient to assemble the support.

[0022] In an optional embodiment, the interference between the support member and the rib portion is C, 0.1 mm≤C≤1 mm.

[0023] Beneficial effect: The interference fit is moderate, which can ensure that the support member is stably maintained in the receiving groove and facilitates the assembly of the support member.

[0024] In a second aspect, the utility model provides a battery, comprising a cover plate assembly, a pole group and a shell as described in any one of the above, wherein the cover plate assembly is arranged at a side opening of the shell, the pole group is arranged in the shell, and the support member is located between the cover plate and the pole group.

[0025] In a third aspect, the utility model provides a battery module, comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 A cross-sectional view of a cover plate assembly according to an embodiment of the utility model;

[0028] Figure 2 for Figure 1 A partial enlarged view of the middle A part;

[0029] Figure 3This is a front view of a cover plate assembly according to an embodiment of the utility model;

[0030] Figure 4 for Figure 3 AA section view;

[0031] Figure 5 It is a schematic diagram of a receiving groove in a cover plate assembly according to an embodiment of the utility model;

[0032] Figure 6 A schematic diagram of the cooperation between the receiving groove and the stopper;

[0033] Figure 7 A cross-sectional view of a stopper in a cover plate assembly according to an embodiment of the utility model;

[0034] Figure 8 A cross-sectional view of another stopper in a cover plate assembly according to an embodiment of the utility model;

[0035] Fig. 9 The present invention is a cross-sectional view of another stopper in a cover plate assembly according to an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1. Cover plate; 2. Pressure relief mechanism; 3. Lower insulating member; 301. Accommodating groove; 302. Guide member; 303. Rib portion; 4. Support member. DETAILED DESCRIPTION

[0038] 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.

[0039] Combine the following Figures 1 to 9 , describing an embodiment of the utility model.

[0040] According to an embodiment of the utility model, on the one hand, a cover plate assembly is provided, which includes a cover plate 1, a lower insulating member 3 and a support member 4, wherein a pressure relief mechanism 2 is provided on the cover plate 1; the lower insulating member 3 is fixedly connected to the inner wall of the cover plate 1, and a receiving groove 301 is provided on the lower insulating member 3; the material of the support member 4 is a high temperature resistant and electrolyte resistant material, the support member 4 is interference fit in the receiving groove 301, and a guide member 302 is provided at the notch of the receiving groove 301 or at the side of the support member 4 facing the receiving groove 301 during installation, and the support member 4 is suitable for sliding into the receiving groove 301 through the guide member 302.

[0041] The cover plate assembly of this structure is applied in the battery. The cover plate assembly is arranged on the opening of the battery shell. The support member 4 is located between the pole group and the cover plate 1. When the battery is thermally runaway, the temperature inside the battery shell rises rapidly. After the lower insulating member 3 melts, the pole group moves toward the cover plate 1 under the action of the high-temperature and high-pressure airflow. Since the support member 4 is resistant to high temperatures, the support member 4 can still be supported between the pole group and the cover plate 1, preventing the pole group from being close to the cover plate 1 and blocking or blocking the pressure relief mechanism 2, ensuring that the pressure relief mechanism 2 is normally opened to exhaust, preventing the battery from exploding, and improving the safety performance of the battery. At the same time, in order to keep the support member 4 stably in the receiving groove 301, the support member 4 and the receiving groove 301 are interference-fitted, which makes the support member 4 inconvenient to install. In order to solve this problem, the utility model sets a guide member 302 at the notch of the receiving groove 301 or the support member 4 on the side facing the receiving groove 301 when installing. When the support member 4 is installed, it slides into the receiving groove 301 along the guide member 302, so as to conveniently and quickly install the support member 4 into the receiving groove 301.

[0042] Optionally, in one embodiment, Figure 2 As shown, the guide member 302 includes a guide slope arranged at the notch of the receiving groove 301. When the support member 4 is installed, it is conveniently and quickly installed into the receiving groove 301 along the guide slope.

[0043] In other embodiments, the guide member 302 may further include an inclined surface disposed on a side of the support member 4 facing the accommodating groove 301 .

[0044] like Figure 1 and Figure 2 As shown, in one embodiment, the inner wall of the receiving groove 301 is protrudingly provided with a strip-shaped rib portion 303, the outer end surface of the rib portion 303 extends to the entrance of the receiving groove 301, the support member 4 is interference fit with the rib portion 303, and the guide member 302 is arranged on the outer end surface of the rib portion 303, that is, the guide slope is arranged on the rib portion 303. When the support member 4 is installed, it slides into the rib portion 303 along the guide slope, and the support member 4 then squeezes the rib portion 303 to be interference installed in the receiving groove 301. The support member 4 is interference fit with the rib portion 303, and the rib portion 303 has a small area, which is convenient for extrusion and deformation to be embedded in the support member 4.

[0045] Optionally, the lower insulating member 3 is a lower plastic, the material of which is plastic, and the accommodating groove 301, the rib portion 303 and the overall structure of the lower plastic are integrally injection molded.

[0046] In other embodiments, the rib portion 303 may not be provided, and the support member 4 may directly press the groove wall of the receiving groove 301 to be interference-fitted into the receiving groove 301. The guide slope is provided at the notch of the receiving groove 301 and is arranged around the notch of the receiving groove 301.

[0047] Alternatively, if Figure 2 As shown, in one embodiment, a plurality of ribs 303 are arranged at intervals on the inner wall of the receiving groove 301, and the ribs 303 are arranged vertically along the groove depth direction of the receiving groove 301, and a guide slope is arranged on the outer end surface of each rib 303. A plurality of ribs 303 are arranged at intervals on the inner wall of the receiving groove 301, so that the support member 4 is stably maintained in the receiving groove 301.

[0048] In other embodiments, the rib portion 303 may also be arranged obliquely along the inner wall of the receiving groove 301 .

[0049] Optionally, in one embodiment, a guide groove is provided at a position corresponding to at least one of the ribs 303 of the support member 4, the guide groove is wrapped around the rib 303 arranged opposite thereto, and at least one of the ribs 303 is interference fit with the outer wall of the support member 4. When the support member 4 is installed, it first slides into the rib 303 along the guide slope, and the guide groove then slides down along the rib 303 to the bottom of the accommodating groove 301, and the rib 303 matched with the guide groove also plays a guiding role, so that the support member 4 can be installed in place.

[0050] Optionally, in this embodiment, a guide groove may be provided on two opposite sides of the support member 4 .

[0051] like Figure 2 As shown, in one embodiment, the receiving groove 301 is rectangular, and the inner wall of each receiving groove 301 is provided with at least two ribs 303, so that the support member 4 fits tightly on each inner wall of the receiving groove 301. Accordingly, the outer contour of the support member 4 is rectangular.

[0052] For example, in this embodiment, two rib portions 303 are provided on each inner wall of the receiving groove 301 , and one rib portion 303 is provided on each of two opposite inner walls of the receiving groove 301 to correspond to the guide groove on the support member 4 .

[0053] In other embodiments, the cross section of the receiving groove 301 perpendicular to the groove depth direction thereof may also be elliptical or trapezoidal, etc., and the outer contour shape of the support member 4 may be adapted to the receiving groove 301. The projection of the support member 4 on the cover plate 1 may be staggered from the pressure relief mechanism 2. When the projection of the support member 4 on the cover plate 1 coincides with the pressure relief mechanism 2, that is, when the support member 4 is arranged below the pressure relief mechanism 2, a pressure relief hole is arranged on the cover plate 1 at the pressure relief mechanism 2, and the support member 4 should extend to the outside of the pressure relief mechanism 2 on the side facing the cover plate 1 so that it can abut against the cover plate 1, so that it can be stably maintained between the electrode group and the cover plate 1 to ensure its supporting effect.

[0054] Alternatively, if Figure 1As shown, in one embodiment, the receiving groove 301 is disposed on a side of the lower insulating member 3 facing the cover plate 1. In other embodiments, the receiving groove 301 may also be disposed on a side of the lower insulating member 3 facing away from the cover plate 1.

[0055] like Figure 2 and Figure 5 As shown, in one embodiment, the thickness of the rib part 303 protruding from the inner wall of the receiving groove 301 is A, the width of the rib part 303 extending laterally along the groove edge of the receiving groove 301 is B, the depth of the rib part 303 extending along the groove depth direction of the receiving groove 301 is H, 0.3mm≤A≤2mm, 0.5≤B≤3mm, H≥5mm. To prevent the rib part 303 from being too small to ensure the interference effect, the thickness of the rib part 303 is A≤2mm, to prevent it from being too thick to be inconvenient to assemble the support member 4.

[0056] like Figure 6 As shown, in one embodiment, the interference between the support member 4 and the rib portion 303 is C, 0.1mm≤C≤1mm, and the interference is moderate, which can ensure that the support member 4 is stably maintained in the receiving groove 301 and facilitate the assembly of the support member 4.

[0057] like Figures 7 to 9 As shown, the support member 4 may be solid, or in other embodiments, a hollow hole is provided in the middle of the support member 4, or the support member 4 may be I-shaped so that the electrolyte can pass through the support member 4 to prevent the electrolyte from accumulating.

[0058] Optionally, in one embodiment, the cover plate 1 is a rectangular cover plate 1, and accordingly, the outer contour of the lower insulating member 3 is also rectangular. The outer contour of the support member 4 is a rectangular block, the long side of the support member 4 extends along the width direction of the lower insulating member 3, and the wide side of the support member 4 extends along the length direction of the lower insulating member 3.

[0059] In one embodiment, Figure 1 and Figure 4 As shown, a supporting member 4 is arranged on the lower insulating member 3 .

[0060] In other embodiments, at least two support members 4 may be spaced apart in the length direction of the lower insulating member 3 .

[0061] Optionally, the support member 4 is made of any material that is resistant to high temperatures and electrolytes, such as ceramics or aluminum alloy.

[0062] Optionally, the pressure relief structure is an explosion-proof valve, a pressure relief hole is provided on the cover plate 1, and the explosion-proof valve is installed on the pressure relief hole. A pole is also provided on the cover plate 1.

[0063] Optionally, the cover plate 1 is a plain aluminum plate.

[0064] According to an embodiment of the utility model, on the other hand, a battery is provided, comprising a cover plate assembly, a pole group and a shell as described above, wherein the cover plate assembly is arranged at an opening on one side of the shell, the pole group is arranged in the shell, and the support member 4 is located between the cover plate 1 and the pole group.

[0065] In the battery of this structure, the support member 4 is located between the cover plate 1 and the electrode group. When the battery is in thermal runaway, the temperature inside the battery shell rises rapidly. The support member 4 is supported between the electrode group and the cover plate 1 to ensure that the pressure relief mechanism 2 is normally opened to exhaust gas, prevent battery explosion, and improve the safety performance of the battery. A guide member 302 is provided on the battery of the utility model. When the support member 4 is installed, it slides into the receiving groove 301 along the guide member 302, so that the support member 4 can be installed in the receiving groove 301 conveniently and quickly.

[0066] According to an embodiment of the present invention, in another aspect, a battery module is provided, comprising the above-mentioned battery.

[0067] The support member 4 of the battery module of this structure is supported between the electrode group and the cover plate 1 when the battery is in thermal runaway, ensuring that the pressure relief mechanism 2 is normally opened to exhaust gas, preventing battery explosion, and improving the safety performance of the battery module. When installing, the support member 4 of the utility model slides into the receiving groove 301 along the guide member 302, so that the support member 4 can be installed in place conveniently and quickly.

[0068] 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 cover plate assembly, characterized in that: include: a cover plate, on which a pressure relief mechanism is provided; A lower insulating member, fixedly connected to the inner side wall of the cover plate, and provided with a receiving groove; The support member is made of a high temperature resistant and electrolyte resistant material. The support member is interference fit in the receiving groove. A guide member is provided at the notch of the receiving groove or on the side of the support member facing the receiving groove during installation. The support member is suitable for sliding into the receiving groove through the guide member.

2. The cover plate assembly according to claim 1, characterized in that: The guide member includes a guide slope arranged at a notch of the accommodating groove.

3. The cover plate assembly according to claim 1 or 2, characterized in that: The inner wall of the receiving groove is protrudingly provided with a strip-shaped rib portion, the outer end surface of the rib portion extends to the entrance of the receiving groove, the support member is interference fit with the rib portion, and the guide member is arranged on the outer end surface of the rib portion.

4. The cover plate assembly according to claim 3, characterized in that: A plurality of rib portions are arranged at intervals on the inner wall of the accommodating groove, and the rib portions are vertically arranged along the groove depth direction of the accommodating groove, and the outer end surface of each rib portion is provided with the guide member.

5. The cover plate assembly according to claim 4, characterized in that: The support member is provided with a guide groove at a position corresponding to at least one of the rib portions, the guide groove is wrapped around the rib portion arranged opposite thereto, and at least one of the plurality of rib portions is interference fit with the outer wall of the support member.

6. The cover plate assembly according to claim 4, characterized in that: The receiving groove is in a rectangular groove shape, and the inner wall of each receiving groove is provided with at least two rib parts.

7. The cover plate assembly according to claim 4, characterized in that: The thickness of the rib portion protruding from the inner wall of the accommodating groove is A, the width of the rib portion extending laterally along the groove edge of the accommodating groove is B, and the depth of the rib portion extending along the groove depth direction of the accommodating groove is H, 0.3mm≤A≤2mm, 0.5≤B≤3mm, H≥5mm.

8. The cover plate assembly according to claim 3, characterized in that: The interference between the support member and the rib portion is C, 0.1 mm≤C≤1 mm.

9. A battery, characterized in that: It comprises the cover plate assembly, pole group and shell according to any one of claims 1 to 8, wherein the cover plate assembly is arranged at a side opening of the shell, the pole group is arranged in the shell, and the support member is located between the cover plate and the pole group.

10. A battery module, characterized in that: A battery comprising the battery of claim 9.

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