Cover plate assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a cover plate assembly and a battery, the cover plate assembly is connected with a battery cell, the cover plate assembly comprises a cover plate body, a pole, a conductive block, a temperature control elastic sheet and a refrigeration sheet, and the pole is arranged on the cover plate body; the conductive block is connected with one end, deviating from the cell, of the pole; the temperature control elastic piece is arranged between the cover plate body and one end, facing the battery cell, of the pole, the temperature control elastic piece has a deformation state and a reset state, and when the temperature control elastic piece is in the deformation state, the temperature control elastic piece is connected with the cover plate body and the pole, so that the cover plate body is electrically connected with the pole; the refrigeration sheet is connected with the conductive block. Therefore, when the internal temperature of the battery abnormally rises, the temperature control elastic sheet can be switched from the reset state to the deformation state, so that the cover plate body is electrically connected with the pole through the temperature control elastic sheet to realize short-circuit protection, the temperature control elastic sheet can repeatedly provide protection for the battery, and the refrigeration sheet can timely lead out heat in the battery; and the safety and the reliability of the battery are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate assembly and a battery. Background Technology

[0002] Batteries are widely used in daily life, industrial production and modern technology. A battery consists of a cover plate, a casing and a cell. The cover plate is connected to terminals and conductive blocks. The conductive blocks are electrically connected to the cell through the terminals, thereby enabling power supply to external circuits.

[0003] To improve battery safety, the cover is usually equipped with explosion-proof valves or SSDs and other protective devices. When an abnormal situation occurs inside the battery, these protective devices can be triggered in time to release internal gas or cut off the current, so as to prevent the battery from further thermal runaway or even explosion.

[0004] However, the triggering of the explosion-proof valve and SSD is irreversible. Once triggered, these protective devices will be damaged and cannot be restored or reused. This not only leads to the waste of materials, but also makes it impossible for the protective devices to continue to function after the battery is first abnormally triggered, making it difficult to meet the battery's requirements for high reliability and long life. Utility Model Content

[0005] The purpose of this invention is to provide a cover plate assembly and a battery to solve the problem that the safety protection device on the battery cover is difficult to reuse.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, a cover plate assembly connected to a battery cell includes: a cover plate body and an electrode post disposed on the cover plate body; a conductive block connected to the end of the electrode post facing away from the battery cell; a temperature control spring disposed between the cover plate body and the end of the electrode post facing the battery cell, the temperature control spring having a deformed state and a reset state, wherein when the temperature control spring is in the deformed state, the temperature control spring is connected to both the cover plate body and the electrode post to achieve electrical connection between the cover plate body and the electrode post; and a cooling element connected to the conductive block.

[0008] Preferably, the cover plate body has a mounting groove on the surface facing the battery cell. The cover plate assembly also includes a lower plastic part, which is disposed on the side of the cover plate body facing the battery cell. The lower plastic part has a connecting hole corresponding to the position of the mounting groove. The temperature control spring includes a fixed part and a movable part. The fixed part is fixedly disposed in the mounting groove, and the movable part can be selectively moved in a direction close to or away from the battery cell. The mounting groove and the connecting hole together form an active space for the movable part to move.

[0009] Preferably, the cross-sectional area of ​​the mounting groove is larger than the cross-sectional area of ​​the connecting hole.

[0010] Preferably, multiple temperature control springs are provided, and the movable parts of the temperature control springs in the same mounting slot are arranged facing each other.

[0011] Preferably, the cover plate assembly further includes an upper plastic layer disposed between the conductive block and the cover plate body, and the cooling element is disposed around the outer side wall of the upper plastic layer.

[0012] Preferably, the height of the cooling element is less than the height of the upper plastic.

[0013] Preferably, the cooling element is connected to a limiting block, and the upper plastic has a limiting groove corresponding to the position of the limiting block, so that the cooling element is snapped into the upper plastic.

[0014] Preferably, the limiting blocks are arranged in a one-to-one correspondence with the limiting grooves, and multiple limiting blocks are arranged around the upper plastic at intervals.

[0015] Preferably, the temperature control spring is made of nickel-titanium shape memory alloy.

[0016] In a second aspect, a battery includes a cell, a housing, and a cover assembly as described above, wherein the cell is disposed inside the housing, and the cover body is connected to the cell.

[0017] The beneficial effects of this utility model are:

[0018] A cover plate assembly connected to a battery cell includes a cover plate body, an electrode post, a conductive block, a temperature control spring, and a cooling element. The electrode post is disposed on the cover plate body. The conductive block is connected to the end of the electrode post away from the battery cell. The temperature control spring is disposed between the cover plate body and the end of the electrode post facing the battery cell. The temperature control spring has a deformed state and a reset state. When the temperature control spring is in the deformed state, it is connected to both the cover plate body and the electrode post, so as to realize the electrical connection between the cover plate body and the electrode post, and the connection between the cooling element and the conductive block.

[0019] In this way, when the internal temperature of the battery rises abnormally, the temperature control spring can quickly switch from the reset state to the deformed state, thereby electrically connecting the cover plate body with the terminal post to achieve short circuit protection and avoid safety problems such as thermal runaway caused by excessive temperature, thus improving battery safety. When the internal temperature of the battery returns to normal, the temperature control spring can return to the reset state, so that the temperature control spring can continuously protect the battery. The cooling chip is connected to the conductive block, so that the heat inside the battery can be quickly transferred to the outside through the conductive block and the cooling chip, reducing material costs and improving battery safety and reliability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the cover plate assembly in one embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of a cover plate assembly in one embodiment of the present invention;

[0022] Figure 3 This is one embodiment of the present invention. Figure 2 Enlarged view of point A;

[0023] Figure 4 This is a partial structural schematic diagram of the cover plate assembly in one embodiment of the present invention.

[0024] In the picture:

[0025] 1. Cover plate body; 11. Mounting groove; 2. Pole post; 3. Conductive block; 4. Temperature control spring; 41. Fixing part; 42. Moving part; 5. Upper plastic; 51. Limiting groove; 6. Cooling element; 61. Limiting block; 7. Lower plastic; 71. Connecting hole. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] See Figures 1 to 3 This utility model provides a cover plate assembly connected to a battery cell. The cover plate assembly includes a cover plate body 1, an electrode post 2, a conductive block 3, a temperature control spring 4, and a cooling element 6. The electrode post 2 is disposed on the cover plate body 1. The conductive block 3 is connected to the end of the electrode post 2 away from the battery cell. The temperature control spring 4 is disposed between the end of the cover plate body 1 and the end of the electrode post 2 facing the battery cell. The temperature control spring 4 has a deformed state and a reset state. When the temperature control spring 4 is in the deformed state, the temperature control spring 4 is connected to both the cover plate body 1 and the electrode post 2, so as to realize the electrical connection between the cover plate body 1 and the electrode post 2, and the cooling element 6 is connected to the conductive block 3.

[0031] In this embodiment, one end of the temperature control spring 4 is fixedly connected to the cover plate body 1. When the internal temperature of the battery rises abnormally, the temperature control spring 4 changes from the reset state to the deformed state. The other end of the temperature control spring 4 moves towards the battery cell until it overlaps with the terminal post 2. When the internal temperature of the battery is within the normal range, the other end of the temperature control spring 4 moves away from the battery cell, so that the cover plate body 1 and the terminal post 2 are disconnected from each other.

[0032] In this way, the temperature control spring 4 can quickly switch from the reset state to the deformed state when the internal temperature of the battery rises abnormally, thereby electrically connecting the cover plate body 1 with the terminal post 2, realizing short circuit protection, avoiding safety problems such as thermal runaway caused by excessive temperature, and improving battery safety. Since the temperature control spring 4 can be repeatedly deformed, it can continuously provide safety protection for the battery. Furthermore, the cooling element 6 is connected to the conductive block 3, which can promptly transfer the heat of the conductive block 3 to the outside. While ensuring battery safety and reliability, the temperature control spring 4 and the cooling element 6 can be reused, extending the battery's service life.

[0033] See Figure 2 and Figure 3In some embodiments, the cover plate body 1 has a mounting groove 11 on the surface facing the battery cell. The cover plate assembly also includes a lower plastic 7, which is disposed on the side of the cover plate body 1 facing the battery cell. The lower plastic 7 has a connecting hole 71 at the position corresponding to the mounting groove 11. The temperature control spring 4 includes a fixed part 41 and a movable part 42. The fixed part 41 is fixedly disposed in the mounting groove 11, and the movable part 42 can be selectively moved in the direction close to or away from the battery cell. The mounting groove 11 and the connecting hole 71 together form an active space for the movable part 42 to move.

[0034] In this embodiment, the thickness direction of the mounting groove 11 and the thickness direction of the connecting hole 71 are parallel to the height direction of the cover plate body 1. The lower plastic 7 is fixedly connected to the cover plate body 1. The end of the pole post 2 facing the battery cell is located on the side of the lower plastic 7 facing the battery cell. The thickness of the mounting groove 11 is equal to the thickness of the temperature control spring 4. That is, the two sides of the temperature control spring 4 in the thickness direction respectively abut against the cover plate body 1 and the lower plastic 7.

[0035] In this way, the fixing part 41 of the temperature control spring 4 can be stably set in the mounting groove 11 and provide support for the moving part 42, so that the moving part 42 can stably switch between the reset state and the deformed state. When the battery temperature rises abnormally, the moving part 42 can respond quickly and connect with the terminal post 2. The moving space formed by the mounting groove 11 and the connecting hole 71 can allow the moving part 42 to move a sufficient distance and avoid the moving part 42 being misaligned or malfunctioning due to interference from other structures, so as to realize short circuit protection, extend the service life of the battery, and improve the reliability and safety of the battery.

[0036] See Figure 3 In some embodiments, the cross-sectional area of ​​the mounting groove 11 is larger than the cross-sectional area of ​​the connecting hole 71. That is, the position where the connecting hole 71 is opened on the lower plastic 7 protrudes from the position where the mounting groove 11 is provided on the cover plate body 1, so as to form a step for supporting the fixing part 41.

[0037] In this embodiment, the thickness of the mounting groove 11 is less than the thickness of the connecting hole 71. In the thickness direction of the cover plate body 1, the projection of the mounting groove 11 and the projection of the connecting hole 71 are both located inside the projection of the pole post 2 towards the end of the battery cell.

[0038] In this way, the fixing part 41 of the temperature control spring 4 can be stably connected with the cover body 1 and the lower plastic 7, preventing the moving part 42 of the temperature control spring 4 from shifting or loosening when it moves, improving the connection stability between the temperature control spring 4 and the terminal 2 when it is in a deformed state, and effectively utilizing the thickness of the cover body 1 and the lower plastic 7, so that the moving part 42 of the temperature control spring 4 can fully abut against the terminal 2, improving the short circuit protection efficiency, realizing the reuse of the temperature control spring 4, reducing material costs, preventing the battery from further thermal runaway, and improving the reliability and safety of the battery.

[0039] It is understandable that the positions of the mounting slot 11 and the connection hole 71 can be adjusted according to actual needs, so that when the battery temperature rises abnormally, the movable part 42 of the temperature control spring 4 can be electrically connected to the terminal post 2. This will not be elaborated here.

[0040] See Figure 3 In some embodiments, multiple temperature control springs 4 are provided, and the movable parts 42 of the temperature control springs 4 in the same mounting groove 11 are arranged facing each other.

[0041] In this embodiment, the cover plate assembly includes two pole posts 2, each pole post 2 is connected to a set of temperature control springs 4, and the same set of temperature control springs 4 is disposed in the same mounting groove 11. There are two sets of temperature control springs 4. When the temperature control springs 4 are in the reset state, the length direction of the two temperature control springs 4 is parallel to the length direction of the cover plate body 1.

[0042] Thus, by setting multiple temperature control springs 4, short-circuit protection can be achieved more sensitively when the internal temperature of the battery rises abnormally, avoiding thermal runaway of the battery. The temperature control springs 4 connected to a terminal post 2 are all set in the same mounting groove 11, which can effectively utilize the space in the mounting groove 11, making the temperature control springs 4 set more compactly, avoiding occupying too much space of the cover plate body 1 and the upper plastic 5, maintaining sufficient structural strength of the cover plate body 1 and the upper plastic 5, which is conducive to the temperature control springs 4 repeatedly providing protection to the battery, improving the reliability and safety of the battery, and extending the battery's service life.

[0043] It is understandable that the number of temperature control springs 4 can be adjusted according to actual needs. Temperature control springs 4 can also be set on only one of the terminals 2, so that when the internal temperature of the battery is abnormal, the cover body 1 and the terminal 2 can be electrically connected through the temperature control springs 4. This will not be listed in detail here.

[0044] See Figure 1 and Figure 4 In some embodiments, the cover assembly further includes an upper plastic 5 disposed between the conductive block 3 and the cover body 1, and a cooling element 6 is disposed around the outer wall of the upper plastic 5.

[0045] In this embodiment, the inner wall of the upper plastic 5 abuts against the side wall of the conductive block 3, the cooling plate 6 is fixedly connected to the upper plastic 5, and at least a portion of the surface of the cooling plate 6 abuts against the conductive block 3.

[0046] Thus, by setting a cooling plate 6 around the outside of the upper plastic 5, the heat inside the battery can be effectively dissipated through the conductive block 3, avoiding thermal runaway caused by excessive internal battery temperature. It also achieves an insulated connection between the conductive block 3 and the cover plate body 1. The cooling plate 6 is fixedly connected to the upper plastic 5, which allows the cooling plate 6 to be stably set on the cover plate body 1. Together with the temperature control spring 4, it can provide heat dissipation and short circuit protection for the battery when the internal temperature of the battery is repeatedly abnormal, further improving the safety and reliability of the battery.

[0047] See Figure 1 and Figure 4 In some embodiments, the height of the cooling element 6 is less than the height of the upper plastic 5; that is, the surface of the upper plastic 5 facing away from the cover plate body 1 protrudes from the surface of the cooling element 6 facing away from the cover plate body 1. In this embodiment, the height of the upper plastic 5 is less than the height of the conductive block 3.

[0048] Thus, the upper plastic 5 can isolate and support the cooling chip 6, enabling the cooling chip 6 to dissipate heat stably. The upper plastic 5 protrudes from the cooling chip 6, allowing the conductive block 3 to fully contact the air, reducing heat accumulation, and facilitating the connection of the conductive block 3 to external circuits. This avoids poor heat dissipation due to an overly compact structure, which helps the cooling chip 6 maintain good heat dissipation during battery use, enabling the cooling chip 6 to be reused, thereby improving the reliability and safety of the battery.

[0049] It is understandable that the height difference between the cooling element 6, the upper plastic 5, and the conductive block 3 can be adjusted according to actual needs, which will not be elaborated here.

[0050] See Figure 4 In some embodiments, the cooling element 6 is connected to the limiting block 61, and the upper plastic 5 has a limiting groove 51 at the position corresponding to the limiting block 61, so that the cooling element 6 is snapped into the upper plastic 5.

[0051] In this embodiment, the limiting block 61 is fixedly disposed on the inner wall of the plastic 5 facing upward of the cooling chip 6, and the conductive block 3 is disposed on the side of the limiting block 61 away from the cover plate body 1 and abuts against the limiting block 61, so that the heat of the conductive block 3 can be conducted to the cooling chip 6.

[0052] In this way, the cooling element 6 and the upper plastic 5 are engaged through the cooperation of the limiting block 61 and the limiting groove 51, which can limit the relative position of the cooling element 6 and the upper plastic 5 on the cover plate body 1. This facilitates the assembly of the cooling element 6 and the upper plastic 5 onto the conductive block 3, prevents the cooling element 6 from becoming loose during assembly, improves the overall structural stability of the cover plate assembly, and allows heat to be quickly transferred from the conductive block 3 to the cooling element 6. This prevents safety issues such as overheating and thermal runaway of the battery, and helps the cooling element 6 to continuously protect the battery and extend the battery's service life.

[0053] It is understandable that the cooling element 6 can also be bonded to the upper plastic 5. The connection method between the cooling element 6 and the upper plastic 5 can be adjusted according to actual needs. In this embodiment, the cooling element 6 is snapped to the upper plastic 5 to facilitate the assembly of the cooling element 6 and to enable the cooling element 6 to directly conduct heat and improve heat dissipation efficiency.

[0054] See Figure 4 In some embodiments, the limiting blocks 61 and the limiting grooves 51 are arranged in a one-to-one correspondence, and multiple limiting blocks 61 are arranged at intervals around the upper plastic 5. In this embodiment, five limiting blocks 61 are provided on one cooling chip 6.

[0055] In this way, multiple limiting blocks 61 are locked in the limiting groove 51, which can improve the connection stability between the cooling chip 6 and the upper plastic 5, prevent the cooling chip 6 from shifting or loosening due to excessive local force during assembly, facilitate cooperation with the temperature control spring 4, provide repeatable protection for the battery, improve the reliability and safety of the battery, and extend the battery's service life.

[0056] It is understandable that the number of limit blocks 61 can be adjusted according to actual needs, as long as it can achieve a stable connection between the cooling chip 6 and the upper plastic 5, and will not be listed in detail here.

[0057] See Figure 1 In some embodiments, the temperature control spring 4 is made of nickel-titanium shape memory alloy.

[0058] In this way, the temperature control spring 4 made of nickel-titanium shape memory alloy can sensitively deform according to temperature changes, so that when the internal temperature of the battery rises abnormally, the moving part 42 can connect with the terminal 2 in time and provide short circuit protection for the battery. When the battery temperature drops to the normal range, it can return to the reset state, so that the temperature control spring 4 can be reused, providing continuous protection for the battery, improving battery safety, and extending battery life.

[0059] It is understandable that the material of the temperature control spring 4 can be adjusted according to actual needs, which will not be elaborated here.

[0060] See Figure 1 This utility model provides a battery, including a cell, a casing and a cover plate assembly, wherein the cell is disposed inside the casing and the cover plate body 1 is connected to the cell.

[0061] In this embodiment, the cover plate body 1 is fixedly connected to the shell and encloses a space for accommodating the battery cell.

[0062] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cover plate assembly, characterized in that, The cover plate assembly, connected to the battery cell, includes: The cover plate body (1) and the pole post (2), wherein the pole post (2) is disposed on the cover plate body (1); Conductive block (3), the conductive block (3) is connected to the end of the electrode (2) away from the battery cell; Temperature control spring (4) is disposed between the cover plate body (1) and the end of the pole (2) facing the battery cell. The temperature control spring (4) has a deformed state and a reset state. When the temperature control spring (4) is in the deformed state, the temperature control spring (4) is connected to both the cover plate body (1) and the pole (2) to realize the electrical connection between the cover plate body (1) and the pole (2). A cooling chip (6) is connected to the conductive block (3).

2. The cover plate assembly according to claim 1, characterized in that, The cover plate body (1) has an installation groove (11) on the surface facing the battery cell. The cover plate assembly also includes a lower plastic (7). The lower plastic (7) is disposed on the side of the cover plate body (1) facing the battery cell. The lower plastic (7) has a connection hole (71) at the position corresponding to the installation groove (11). The temperature control spring (4) includes a fixed part (41) and a movable part (42). The fixed part (41) is fixedly disposed in the installation groove (11). The movable part (42) can be selectively moved in a direction close to or away from the battery cell. The installation groove (11) and the connection hole (71) together form an active space for the movable part (42) to move.

3. The cover plate assembly according to claim 2, characterized in that, The cross-sectional area of ​​the mounting groove (11) is larger than the cross-sectional area of ​​the connecting hole (71).

4. The cover plate assembly according to claim 2, characterized in that, Multiple temperature control springs (4) are provided, and the movable parts (42) of the temperature control springs (4) in the same mounting groove (11) are arranged facing each other.

5. The cover plate assembly according to claim 1, characterized in that, The cover plate assembly also includes an upper plastic (5), which is disposed between the conductive block (3) and the cover plate body (1), and the cooling chip (6) is disposed around the outer side wall of the upper plastic (5).

6. The cover plate assembly according to claim 5, characterized in that, The height of the cooling element (6) is less than the height of the upper plastic (5).

7. The cover plate assembly according to claim 5, characterized in that, The cooling element (6) is connected to a limiting block (61), and the upper plastic (5) has a limiting groove (51) corresponding to the position of the limiting block (61) so that the cooling element (6) and the upper plastic (5) can be engaged.

8. The cover plate assembly according to claim 7, characterized in that, The limiting block (61) is provided in a one-to-one correspondence with the limiting groove (51), and multiple limiting blocks (61) are provided at intervals around the upper plastic (5).

9. The cover plate assembly according to any one of claims 1-8, characterized in that, The temperature control spring (4) is made of nickel-titanium shape memory alloy.

10. A battery, characterized in that, It includes a battery cell, a housing, and a cover plate assembly as described in any one of claims 1-9, wherein the battery cell is disposed inside the housing, and the cover plate body (1) is connected to the battery cell.

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