Battery top cover and power battery with same

Abstract

The utility model belongs to the technical field of power batteries, and discloses a battery top cover and a power battery with the same. The battery top cover comprises a top cover piece, a pole, an insulating plastic part and an auxiliary insulating part, a first mounting hole is formed in the top cover piece, a second mounting hole is formed in the insulating plastic part, the pole penetrates through the first mounting hole and the second mounting hole at the same time, and the insulating plastic part is clamped between the top cover piece and the pole in an insulating mode. The auxiliary insulating part is clamped between the insulating plastic part and the top cover sheet; and / or, the auxiliary insulating part is clamped between the pole and the insulating plastic part, and the auxiliary insulating part is set to have a preset melting point. When the battery is in thermal runaway, the auxiliary insulating part can protect the pole from being in short circuit with the top cover piece, so that the high-temperature resistance of the whole insulating plastic part can be enhanced, the thermal runaway process caused by short circuit of the battery is prevented from being intensified, and the use safety and reliability of the battery top cover are effectively improved. Comprising the battery top cover is high in safety coefficient and good in quality when being used.

Description

Technical Field

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

[0002] With the development of society and the enhancement of people's environmental protection awareness, more and more devices such as mobile phones, laptops and electric vehicles choose lithium batteries as power sources. Among them, the lithium batteries used in electric vehicles and the like are generally called power batteries.

[0003] As an important part of the power battery, the top cover generally includes a top cover sheet, a pole column and an insulating plastic part, etc. Among them, the pole column is a component for internal and external conduction of the power battery, and the insulating plastic part can strengthen the insulating and sealing effect between the top cover sheet and the pole column. In the prior art, during the use of the power battery, the pole column generates serious heat. Especially when the power battery undergoes thermal runaway, due to poor heat resistance of the insulating plastic part, problems such as softening and melting are likely to occur, resulting in a short circuit connection between the pole column and the top cover plate, thus causing insulation failure, exacerbating the process of battery thermal runaway, and there is a certain potential safety hazard.

[0004] Based on the above situation, there is an urgent need for a battery top cover and a power battery having the same to solve the problems existing in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a battery top cover, which is used to solve the problem of insulation failure between the insulating plastic part and the pole column when the pole column generates serious heat or even the battery undergoes thermal runaway, thereby improving safety.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The battery top cover includes a top cover sheet, a pole column, an insulating plastic part and an auxiliary insulating part. The top cover sheet is provided with a first mounting hole, the insulating plastic part is provided with a second mounting hole, the pole column passes through the first mounting hole and the second mounting hole at the same time, the insulating plastic part is insulatingly clamped between the top cover sheet and the pole column, and the auxiliary insulating part is clamped between the insulating plastic part and the top cover sheet; and / or, the auxiliary insulating part is clamped between the pole column and the insulating plastic part, and the auxiliary insulating part is set to have a preset melting point.

[0008] Preferably, an installation groove is formed in the insulating plastic part, and the auxiliary insulating part is embedded in the installation groove.

[0009] Preferably, the auxiliary insulating part is manufactured and formed by a sintering process, and includes any one of a ceramic ring and a ceramic fiber fireproof cloth.

[0010] Preferably, the cross-sectional shape of the auxiliary insulating member is any one of a rectangle, a semi-circle, a triangle, and a trapezoid.

[0011] Preferably, the surface of the insulating plastic part is coated with the auxiliary insulating member formed by condensation of insulating powder.

[0012] Preferably, the insulating powder includes any one of ceramic powder, resin powder, and plastic powder.

[0013] Preferably, the auxiliary insulating member is provided on one side of the insulating plastic part facing the top cover sheet; and / or, the auxiliary insulating member is provided on one side of the insulating plastic part facing the pole column.

[0014] Preferably, the pole column includes a first clamping part, a pole column body, and a second clamping part. The first clamping part and the second clamping part are located at both ends of the pole column body and protrude from the pole column body, so that the pole column has an "I"-shaped structure. The pole column body passes through the first mounting hole and the second mounting hole. The first clamping part and the second clamping part are spaced apart on two opposite surfaces of the top cover sheet. The insulating plastic part has a "J"-shaped structure and is clamped between the pole column and the top cover sheet.

[0015] Preferably, the preset melting point of the auxiliary insulating member is greater than 500 degrees Celsius.

[0016] The beneficial effects of the battery top cover provided by the present invention: By providing an auxiliary insulating member on the battery top cover, the auxiliary insulating member is clamped between the insulating plastic part and the top cover sheet, and the auxiliary insulating member is set to have a preset melting point. When the battery undergoes thermal runaway, the auxiliary insulating member can protect the pole column from being short-circuited with the top cover sheet, thereby enhancing the high-temperature resistance of the entire insulating plastic part, preventing the battery from short-circuiting and exacerbating the thermal runaway process, and effectively improving the use safety and reliability of the battery top cover.

[0017] The second object of the present invention is to provide a power battery, which is not prone to insulation failure during use, has a lower possibility of battery fire, and improves the safety factor of use.

[0018] To achieve this purpose, the present invention adopts the following technical solutions:

[0019] A power battery, comprising a housing, an electric core, and the above-mentioned battery top cover. The battery top cover is sealed and welded to the open end of the housing, and the electric core is accommodated in the housing.

[0020] The beneficial effects of the power battery provided by the present utility model: The power battery includes a housing, battery cells, and the above-mentioned battery top cover. The battery top cover is sealed and welded to the open end of the housing, and the battery cells are accommodated in the housing. Since an auxiliary insulating member is provided in the battery top cover, when the temperature of the pole column in the power battery is relatively high or even thermal runaway occurs, the auxiliary insulating member can still play the role of electrically insulating the top cover sheet and the pole column, thereby avoiding the situation of short circuit between the two. Therefore, the power battery including this battery top cover is not likely to have insulation failure problems during use, the possibility of battery fire is relatively low, and it has a high safety factor and good quality. Brief Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the battery top cover provided by the present utility model;

[0022] Figure 2 A cross-sectional view of the battery top cover provided by the present utility model;

[0023] Figure 3 is a cross-sectional view of the battery top cover provided in Embodiment 1 of the present utility model;

[0024] Figure 4 is Figure 3 a partial enlarged view of A in

[0025] Figure 5 is a cross-sectional view of the battery top cover provided in Embodiment 2 of the present utility model;

[0026] Figure 6 is Figure 5 a partial enlarged view of B in

[0027] In the figure:

[0028] 1. Top cover sheet; 11. First mounting hole;

[0029] 2. Pole column; 21. First clamping portion; 22. Pole column body; 23. Second clamping portion;

[0030] 3. Insulating plastic part; 31. Second mounting hole; 32. Mounting groove;

[0031] 4. Auxiliary insulating member. Detailed Embodiment

[0032] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings, rather than all the structures.

[0033] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0035] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", and "left" are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0036] The following introduces the technical solution provided by the present utility model in conjunction with the drawings and specific embodiments.

[0037] Embodiment 1

[0038] As Figures 1 to 4 shown, this embodiment provides a battery top cover, including a top cover sheet 1, a pole column 2, and an insulating plastic part 3. Among them, a first mounting hole 11 is provided on the top cover sheet 1, a second mounting hole 31 is provided on the insulating plastic part 3, and the pole column 2 passes through the first mounting hole 11 and the second mounting hole 31 at the same time to assemble the pole column 2 on the top cover sheet 1. At this time, the insulating plastic part 3 is insulatingly clamped between the top cover sheet 1 and the pole column 2 to form an isolation layer between the top cover sheet 1 and the pole column 2, thereby realizing the electrical insulation between the top cover sheet 1 and the pole column 2 and preventing short circuit.

[0039] Specifically, referring to Figure 2As shown in the figure, in this embodiment, the terminal post 2 includes a first clamping portion 21, a terminal post body 22, and a second clamping portion 23. Among them, the first clamping portion 21 and the second clamping portion 23 are located at both ends of the terminal post body 22 and protrude from the terminal post body 22. It should be noted that before the terminal post 2 is fixedly assembled to the top cover piece 1, the terminal post 2 has a "T" - shaped structure. The first clamping portion 21 protrudes vertically upward from the upper surface of the terminal post body 22, and the second clamping portion 23 protrudes radially below the outer side wall of the terminal post body 22. In addition, the insulating plastic part 3 has a "Ji" - shaped structure. The insulating plastic part 3 covers the side wall and the opening of the first mounting hole 11, and the second mounting hole 31 is coaxially arranged with the first mounting hole 11.

[0040] When assembling the terminal post 2, first, the terminal post body 22 passes through the first mounting hole 11 and the second mounting hole 31 from bottom to top at the same time. The second clamping portion 23 abuts against the insulating plastic part 3, and then the terminal post 2 is riveted by a riveting device, so that the first clamping portion 21 on the upper surface of the terminal post body 22 is deformed, and the terminal post 2 as a whole is deformed into an "I" - shaped structure. The first clamping portion 21 presses against the insulating plastic part 3, thus completing the sealed assembly among the terminal post 2, the top cover piece 1, and the insulating plastic part 3. Through the above - mentioned setting, the setting of the sealing ring in the existing battery top cover is omitted, thereby improving the connection tightness among the terminal post 2, the insulating plastic part 3, and the top cover piece 1, and also saving the manufacturing cost.

[0041] During the use of the battery, the situation that the terminal post 2 gets seriously heated may occur. Especially when the battery undergoes thermal runaway, the insulating plastic part 3 on the top cover piece 1 has poor heat - resistance, so problems such as softening and melting will occur, resulting in the failure of the isolation layer between the terminal post 2 and the top cover piece 1, and the short - circuit connection between the two, which exacerbates the process of battery thermal runaway, so there are still certain potential safety hazards.

[0042] To solve the above problems, the battery top cover provided in this embodiment further includes an auxiliary insulating part 4. The auxiliary insulating part 4 is clamped between the insulating plastic part 3 and the top cover piece 1. The auxiliary insulating part 4 is set to have a preset melting point. When the battery undergoes thermal runaway, the auxiliary insulating part 4 can protect the terminal post 2 from being short - circuited with the top cover piece 1, thereby enhancing the high - temperature resistance of the entire insulating plastic part 3, preventing the battery from short - circuiting and exacerbating the thermal runaway process, and effectively improving the use safety and reliability of the battery top cover.

[0043] Preferably, in this embodiment, the preset melting point of the auxiliary insulating member 4 is greater than 500 degrees Celsius to meet the actual requirements. It should be noted that the auxiliary insulating member 4 provided in this embodiment is manufactured and formed by a sintering process. For example, the auxiliary insulating member 4 can be any one of a ceramic ring and a ceramic fiber fireproof cloth. Both the ceramic ring and the ceramic fiber fireproof cloth have excellent high-temperature resistance, can maintain structural integrity and functionality at high temperatures, and can effectively block current, effectively avoiding the risk of short circuit between the pole column 2 and the top cover piece 1.

[0044] Furthermore, in this embodiment, referring to Figure 4 As shown, an installation groove 32 is formed on the insulating plastic part 3. It can be understood that the installation groove 32 is an annular groove to match the outer shape of the auxiliary insulating member 4. The auxiliary insulating member 4 can be embedded in the installation groove 32, thus saving installation space, making the assembly between the pole column 2, the top cover piece 1, the insulating plastic part 3 and the auxiliary insulating member 4 in the battery top cover more compact, and also helping to improve the energy density of the entire battery.

[0045] Even further, in this embodiment, the installation groove 32 is formed at a position on the insulating plastic part 3 facing the upper surface of the top cover piece 1, so as to facilitate the installation of the auxiliary insulating member 4.

[0046] Optionally, in this embodiment, the cross-sectional shape of the auxiliary insulating member 4 is a rectangular shape, so as to increase the contact area between the auxiliary insulating member 4 and the top cover piece 1, thereby further reducing the possibility of short circuit between the top cover piece 1 and the pole column 2, effectively improving the insulation performance and stability, and enabling the auxiliary insulating member 4 to meet the actual insulation requirements. Of course, the cross-sectional shape of the auxiliary insulating member 4 can also be semi-circular, triangular or trapezoidal, as long as the auxiliary insulating member 4 can meet the actual insulation requirements and ensure that when the insulating plastic part 3 softens or melts, the auxiliary insulating member 4 can continue to isolate the top cover piece 1 and the pole column 2, it is within the protection scope of the present invention.

[0047] Embodiment Two

[0048] This embodiment provides a battery top cover, including a top cover piece 1, a pole column 2, an insulating plastic part 3 and an auxiliary insulating member 4. The top cover piece 1, the pole column 2 and the insulating plastic part 3 in this battery top cover have the same structures as those in the battery top cover provided in Embodiment One, and the difference lies in the auxiliary insulating member 4.

[0049] Specifically, in combination with Figure 5 and Figure 6As shown, in this embodiment, the surface of the insulating plastic part 3 is coated with an auxiliary insulating part 4 formed by condensation of insulating powder. Through the above arrangement, the auxiliary insulating part 4 formed by condensation of insulating powder is more dense, firm and uniform, and can provide a better insulation effect.

[0050] Preferably, in this embodiment, the insulating powder is ceramic powder, so that the auxiliary insulating member 4 has high temperature resistance and insulation performance that meet actual working conditions. Of course, in other parallel embodiments, the insulating powder can also be resin powder or plastic powder, and the utility model is not limited to this.

[0051] More specifically, in this embodiment, the above-mentioned auxiliary insulating member 4 is provided on the side of the insulating plastic member 3 facing the top cover sheet 1, and on the side of the insulating plastic member 3 facing the pole 2. The advantages of providing the auxiliary insulating member 4 formed by condensation of insulating powder are: not only the process is simple and the operation is convenient, the thickness of the formed auxiliary insulating member 4 is thin, and there is no need to groove the insulating plastic member 3 to reduce the occupied area, but also the auxiliary insulating member 4 can be coated on both surfaces of the insulating plastic member 3 relative to the pole 2 and the top cover sheet 1 at the same time, thereby greatly reducing the possibility of short circuit between the pole 2 and the top cover sheet 1, so that the safety and reliability of the battery top cover is significantly enhanced.

[0052] Embodiment 3

[0053] This embodiment provides a power battery, which is cylindrical, and of course can also be a square shell battery, which is not limited by the present invention. The power battery includes a shell, a battery cell and a battery cover in any of the above embodiments, wherein the battery cover is sealed and welded to the open part of the shell, and the battery cell is accommodated in the shell. Since an auxiliary insulating member 4 is provided in the battery cover, when the temperature of the pole 2 in the power battery is high or even thermal runaway occurs, the auxiliary insulating member 4 can still play the role of the electrical insulating top cover sheet 1 and the pole 2, thereby avoiding the short circuit between the two. Therefore, the power battery including this battery cover is not prone to insulation failure during use, the possibility of battery fire is low, and the safety factor is high and the quality is good.

[0054] In the description of this specification, the description of reference terms such as "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. Battery top cover, characterized in that It includes a top cover sheet (1), a terminal post (2), an insulating plastic part (3) and an auxiliary insulating part (4). A first mounting hole (11) is provided on the top cover sheet (1), and a second mounting hole (31) is provided on the insulating plastic part (3). The terminal post (2) passes through the first mounting hole (11) and the second mounting hole (31) simultaneously. The insulating plastic part (3) is insulatingly clamped between the top cover sheet (1) and the terminal post (2), and the auxiliary insulating part (4) is clamped between the insulating plastic part (3) and the top cover sheet (1); and / or, the auxiliary insulating part (4) is clamped between the terminal post (2) and the insulating plastic part (3), and the auxiliary insulating part (4) is set to have a preset melting point.

2. The battery top cover according to claim 1, wherein, An installation groove (32) is formed on the insulating plastic part (3), and the auxiliary insulating part (4) is embedded in the installation groove (32).

3. The battery top cover according to claim 2, characterized in that, The auxiliary insulating part (4) is manufactured and formed by a sintering process and includes any one of a ceramic ring and a ceramic fiber fireproof cloth.

4. The battery top cover according to claim 2, characterized in that, The cross-sectional shape of the auxiliary insulating part (4) is any one of a rectangle, a semi-circle, a triangle and a trapezoid.

5. The battery top cover according to claim 1, characterized in that, The surface of the insulating plastic part (3) is coated with the auxiliary insulating part (4) formed by condensation of insulating powder.

6. The battery top cover according to claim 5, characterized in that, The insulating powder includes any one of ceramic powder, resin powder and plastic powder.

7. The battery top cover according to claim 1, wherein The auxiliary insulating part (4) is provided on one side of the insulating plastic part (3) facing the top cover sheet (1); and / or, the auxiliary insulating part (4) is provided on one side of the insulating plastic part (3) facing the terminal post (2).

8. The battery top cover according to any one of claims 1-7, characterized in that, The terminal post (2) includes a first clamping part (21), a terminal post body (22) and a second clamping part (23). The first clamping part (21) and the second clamping part (23) are located at both ends of the terminal post body (22) and protrude from the terminal post body (22), so that the terminal post (2) has an "I"-shaped structure. The terminal post body (22) passes through the first mounting hole (11) and the second mounting hole (31). The first clamping part (21) and the second clamping part (23) are spaced apart on two opposite surfaces of the top cover sheet (1). The insulating plastic part (3) has a "C"-shaped structure and is clamped between the terminal post (2) and the top cover sheet (1).

9. The battery top cover according to any one of claims 1-7, characterized in that, The preset melting point of the auxiliary insulating part (4) is greater than 500 degrees Celsius.

10. Power battery, characterized in that, It includes a housing, an electric core and the battery top cover according to any one of claims 1-9. The battery top cover is sealed and welded at the open end of the housing, and the electric core is accommodated in the housing.

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