Battery cell cover plate and battery

Abstract

The utility model relates to a battery field provides a kind of battery and electric core cover plate.Electric core cover plate includes lower plastic;Cover plate body, the first side surface of cover plate body is installed in lower plastic, the second side surface of cover plate body is formed with the boss portion that protrudes towards the direction away from lower plastic;Upper plastic, along the length direction of cover plate body and be located at the both ends of boss portion in cover plate body, at least the side of upper plastic close to boss portion is formed with the shielding portion that protrudes towards the direction away from lower plastic.The electric core cover plate can directly export the heat of cover plate body and pole, joule heat of outer connecting sheet, solve the problem that traditional cooling system cannot cover cover plate area comprehensively.The split type layout of upper plastic does not occupy the functional area of boss portion and pole, both guarantee heat dissipation and insulation function, and also reserve installation space for explosion-proof valve, pole and other components, realize the compact integration of multi-function.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and provides a cell cover plate and a battery. Background Technology

[0002] A common technical challenge in current battery pack designs is cooling the cell cover. Existing cooling systems often only cool the exterior of the battery pack, failing to directly and effectively cool the cell cover. This can lead to accelerated aging of the cells due to heat accumulation during use, affecting overall performance and safety. This is mainly because existing cooling systems are relatively simple in design and cannot achieve a tight fit with the cell cover, significantly reducing cooling effectiveness.

[0003] Furthermore, existing cooling plate designs also have shortcomings for the overall battery pack (PACK). Due to structural limitations, current commercially available integrated cooling plates cannot achieve a tight fit with the cell terminals, resulting in low efficiency of the cooling medium (such as coolant) in heat transfer. This design flaw not only affects the cooling effect but also increases the uneven temperature distribution within the battery pack, further impacting its operating efficiency and lifespan. Utility Model Content

[0004] This utility model provides a battery cell cover plate to solve the defects of poor cooling performance and poor insulation effect of battery cell cover plates in related technologies.

[0005] This utility model embodiment also provides a battery.

[0006] The first aspect of this utility model provides a battery cell cover plate, comprising: Plastic bottom; The cover plate body has a first side mounted on the lower plastic, and a second side formed with a boss protruding in a direction away from the lower plastic. An upper plastic is disposed on the lower plastic along the length of the cover plate body and located at both ends of the protrusion portion. At least one side of the upper plastic near the protrusion portion has a blocking portion that protrudes in a direction away from the lower plastic.

[0007] According to one embodiment of the present invention, along the thickness direction of the cover plate body, the height of the boss portion is equal to the sum of the height of the pole post and the height of the outer connecting piece.

[0008] According to one embodiment of the present invention, the height of the blocking portion is the same as the height of the boss portion along the thickness direction of the cover plate body.

[0009] According to one embodiment of the present invention, along the length direction of the cover plate body, the length of the boss portion is less than the length of the cover plate body, and a mounting position for mounting the upper plastic is formed on the segment of the cover plate body that extends beyond the boss portion.

[0010] According to one embodiment of the present invention, the mounting position is provided with a first mounting hole for mounting the pole post.

[0011] According to one embodiment of the present invention, the upper plastic includes a positive electrode upper plastic and a negative electrode upper plastic, and the positive electrode upper plastic and the negative electrode upper plastic are symmetrically arranged about the center line of the width direction of the cover plate body.

[0012] According to one embodiment of the present invention, a second mounting hole is formed on the boss portion, and an explosion-proof valve is installed in the second mounting hole.

[0013] According to one embodiment of the present invention, a protective patch is provided on the side of the explosion-proof valve opposite to the second mounting hole.

[0014] According to one embodiment of the present invention, along the width direction of the cover plate body, the width of the blocking portion is greater than or equal to the width of the boss portion, and the width of the blocking portion is less than or equal to the width of the cover plate body.

[0015] A second aspect of this utility model provides a battery, including a housing, on which a cell cover plate as described above is disposed.

[0016] According to the first aspect of the present invention, the height design of the boss portion makes the top surface of the cover plate body flush with the top surface of the terminal post and the external connecting piece. The water-cooling plate in the entire PACK can simultaneously adhere to both, directly dissipating the heat of the cover plate body (heat dissipation of the main body of the battery cell) and the Joule heat of the terminal post and the external connecting piece (heat dissipation of current transmission). This solves the problem that traditional cooling systems cannot fully cover the cover plate area, significantly improving heat dissipation efficiency. The shielding portion, through a reasonable design of height and width, forms a physical barrier between the boss portion (cover plate body) and the external connecting piece, blocking the leakage path along the surface and avoiding the risk of short circuit due to direct contact between the two or the accumulation of impurities. This is especially suitable for high-voltage battery cell scenarios. The coplanar design of the boss portion and the external connecting piece allows the water-cooling plate to cover the entire cover plate area with a flat structure without having to avoid height differences, reducing cooling dead zones. The height of the shielding portion is consistent with that of the boss portion, avoiding local compression or gaps on the water-cooling plate and ensuring the stability of heat dissipation contact. The split layout of the upper plastic part (located at both ends of the boss) does not occupy the functional areas of the boss and the pole, ensuring heat dissipation and insulation functions, while reserving installation space for components such as explosion-proof valves and poles, achieving a compact integration of multiple functions.

[0017] According to the battery provided in the second aspect of this utility model, the protruding part of the cell cover allows for efficient heat dissipation from the top of the battery through a water-cooling plate, which works in conjunction with the heat dissipation from the side wall of the casing. This solves the problem of weak heat dissipation at the top of traditional batteries, effectively reducing temperature accumulation in the cell during charging and discharging, and maintaining stable battery temperature, especially under high-rate conditions. The sealed fit between the cell cover and the casing ensures that the electrolyte will not leak, while the integrated design of the explosion-proof valve allows for rapid pressure relief in case of abnormal internal pressure, preventing the casing from rupturing due to overpressure. The insulating isolation effect of the upper plastic shield reduces the risk of short circuit between the terminals and the cover body, indirectly improving the electrical safety of the battery. The compact design of the cell cover (such as the coplanar layout of the protruding part and the terminals) reduces the space occupied at the top of the battery, allowing more cell material to be accommodated inside the casing, increasing battery capacity within the same volume. At the same time, the standardized cover size facilitates compatibility with casings of different specifications, enhancing versatility. The efficient heat dissipation system reduces the aging effect of temperature fluctuations on cell materials, especially significantly protecting the stability of electrode materials and electrolyte. The reliable sealing structure reduces the probability of electrolyte evaporation or deterioration, and combined with the stability of insulation, extends the battery's cycle life. The standardized fit design of the cell cover and casing allows for automated assembly (such as laser welding), reducing manual steps. Furthermore, components integrated into the cover, such as terminals and explosion-proof valves, do not require separate openings in the casing, reducing production complexity. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic perspective view of the battery cell cover plate provided by this utility model.

[0020] Figure 2 This is a schematic top view of the battery cell cover plate provided by this utility model.

[0021] Figure 3 This is a schematic partial enlarged view of the battery cell cover plate provided by this utility model.

[0022] Figure 4 This is a schematic perspective view of the first type of plastic coating provided by this utility model.

[0023] Figure 5 This is a schematic perspective view of the second type of plastic coating provided by this utility model.

[0024] Figure 6 This is a schematic perspective view of the third type of plastic coating provided by this utility model.

[0025] Figure label: 100. Lower plastic; 102. Cover plate body; 104. Boss; 106. Upper plastic; 108. Shielding part; 110. Terminal post; 112. External connecting piece; 114. Upper plastic of positive electrode; 116. Upper plastic of negative electrode; 118. Second mounting hole; 120. Explosion-proof valve; 122. Protective patch. Detailed Implementation

[0026] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0027] like Figures 1 to 6 As shown, the first aspect of this utility model provides a battery cell cover plate, comprising: 100g of plastic; The cover plate body 102 has a first side mounted on the lower plastic 100, and a second side of the cover plate body 102 has a boss portion 104 protruding in a direction away from the lower plastic 100. The upper plastic 106 is disposed on the cover body 102 along the length direction of the cover body 102 and located at both ends of the boss portion 104. At least one side of the upper plastic 106 near the boss portion 104 has a blocking portion 108 that protrudes in a direction away from the lower plastic 100.

[0028] According to the first aspect embodiment of the present invention, the height design of the boss portion 104 makes the top surface of the cover plate body 102 flush with the top surface of the terminal post 110 and the external connecting piece 112. The water-cooling plate in the entire PACK can simultaneously adhere to both, directly dissipating the heat of the cover plate body 102 (heat dissipation of the main body of the battery cell) and the Joule heat of the terminal post 110 and the external connecting piece 112 (heat dissipation of current transmission). This solves the problem that traditional cooling systems cannot fully cover the cover plate area, significantly improving heat dissipation efficiency. The shielding portion 108, through a reasonable design of height and width, forms a physical barrier between the boss portion 104 (cover plate body 102) and the external connecting piece 112, blocking the leakage path along the surface and avoiding the risk of short circuit due to direct contact between the two or the accumulation of impurities. This is especially suitable for high-voltage battery cell scenarios. The coplanar design of the boss portion 104 and the outer connecting piece 112 allows the water-cooling plate to cover the entire cover area without needing to avoid height differences, reducing cooling dead zones. The height of the shielding portion 108 is consistent with that of the boss portion 104, avoiding local compression or gaps on the water-cooling plate and ensuring stable heat dissipation contact. The split layout of the upper plastic part 106 (located at both ends of the boss portion 104) does not occupy the functional areas of the boss portion 104 and the pole post 110, ensuring both heat dissipation and insulation functions, while reserving installation space for components such as the explosion-proof valve 120 and the pole post 110, achieving a compact integration of multiple functions.

[0029] Please continue reading Figures 1 to 6 The battery cell cover provided in the first aspect of this utility model achieves the dual functions of efficient heat dissipation and insulation protection through the coordinated design of the boss portion 104 and the shield portion 108.

[0030] The lower plastic 100 is made of insulating and high-temperature resistant material (such as PBT+glass fiber), and is injection molded to cover the first side (bottom) of the cover plate body 102, providing support for the cover plate body 102 and realizing electrical isolation inside the cell. The thickness is adapted to the overall size of the cell.

[0031] The cover plate body 102 is made of high thermal conductivity aluminum alloy. The first side is tightly attached to the lower plastic 100, and the second side (top surface) is stamped to form a boss 104. The boss 104 extends along the width direction of the cover plate body 102, and the protruding direction is away from the lower plastic 100. Its height is consistent with the total height of the pole post 110 and the outer connecting piece 112 to ensure that the contact surface with the water cooling plate is flat.

[0032] The upper plastic 106 is an insulating plastic part (material same as the lower plastic 100), distributed along the length of the cover plate body 102 at both ends of the boss portion 104, and fixed to the top surface of the cover plate body 102 by snap-fit ​​or adhesive. The upper plastic 106 forms a shielding portion 108 on one (or three) side near the boss portion 104. The shielding portion 108 protrudes away from the lower plastic 100, with the same height as the boss portion 104 and the width covering the gap area between the boss portion 104 and the pole post 110, forming a physical barrier.

[0033] The height of the boss portion 104 matches the total height of the pole post 110 and the outer connecting piece 112, so that the top surfaces of both are on the same plane, providing a continuous contact surface for the water-cooled plate. The height of the shield portion 108 is the same as that of the boss portion 104, which neither hinders the installation of the water-cooled plate nor completely isolates the boss portion 104 from the outer connecting piece 112. The shield portion 108 is located between the boss portion 104 and the pole post 110, extending along the width direction of the cover plate body 102. Its inner side is in contact with the edge of the boss portion 104, and its outer side maintains a safe distance from the outer connecting piece 112, forming a closed insulating barrier.

[0034] According to one embodiment of the present invention, along the thickness direction of the cover plate body 102, the height of the boss portion 104 is equal to the sum of the height of the pole post 110 and the height of the outer connecting piece 112.

[0035] In one embodiment of this utility model, along the thickness direction of the cover plate body 102 (i.e., the protruding direction of the boss portion 104), the height of the boss portion 104 is precisely matched and designed to be completely consistent with the sum of the heights of the pole post 110 (from the surface of the cover plate body 102 to the top) and the outer connecting piece 112 (covering the top of the pole post 110). After the pole post 110 is installed in the mounting position of the cover plate body 102, its top end is welded and fixed to the outer connecting piece 112. After the three are assembled, the top surface of the boss portion 104, the top end of the pole post 110, and the top surface of the outer connecting piece 112 are on the same plane, and the flatness error is controlled within a very small range, ensuring that the upper water-cooling plate can simultaneously and tightly fit these three areas.

[0036] The boss 104 is at the same height as the pole 110 and the external connecting piece 112, allowing the upper water-cooling plate to achieve full coverage without having to avoid height differences. It simultaneously contacts the cover plate body 102 (through the boss 104) and the pole 110 area (through the external connecting piece 112), maximizing the heat dissipation area and improving the overall pack's cooling efficiency. The coplanar design ensures that the pressure of the water-cooling plate is evenly distributed on the boss 104 and the external connecting piece 112, avoiding excessive localized stress due to height differences, reducing the risk of deformation of the cover plate body 102 or the pole 110, and extending component lifespan. It eliminates the need for complex concave-convex structures to accommodate different height areas, reducing the processing difficulty and cost of the water-cooling plate, while also minimizing dead zones for coolant flow caused by structural complexity.

[0037] According to one embodiment of the present invention, along the thickness direction of the cover plate body 102, the height of the blocking portion 108 is the same as the height of the boss portion 104.

[0038] In one embodiment of this invention, along the thickness direction of the cover plate body 102, the protrusion height of the shielding portion 108 is completely consistent with that of the boss portion 104, and their top ends are on the same plane. The shielding portion 108 extends upward from the gap area between the outer connecting piece 112 and the boss portion 104, with its inner side close to the edge of the boss portion 104 and its outer side maintaining a small gap with the outer connecting piece 112, forming an insulating barrier perpendicular to the surface of the cover plate body 102. The height of the shielding portion 108 is precisely controlled by the mold to ensure that the height deviation with the boss portion 104 does not affect the adhesion of the water-cooling plate.

[0039] The shielding portion 108 is at the same height as the boss portion 104, which can completely block the surface leakage path between the boss portion 104 (cover plate body 102) and the outer connecting piece 112, avoiding the risk of arcing breakdown caused by their close proximity, especially improving safety under high voltage conditions. The equal height design ensures that the top of the shielding portion 108 is not higher than the boss portion 104 and the outer connecting piece 112, ensuring that the water-cooling plate can smoothly cover the entire area without being blocked or propped up by the shielding portion 108, maintaining stable heat dissipation contact. The height support of the shielding portion 108 can reduce the warping deformation of the upper plastic 106 during temperature cycling, ensuring that it can still maintain the isolation effect on the boss portion 104 and the outer connecting piece 112 after long-term use, maintaining stable insulation performance.

[0040] According to one embodiment of the present invention, along the length direction of the cover plate body 102, the length of the boss portion 104 is less than the length of the cover plate body 102, and a mounting position for mounting the plastic 106 is formed on the segment of the cover plate body 102 that extends beyond the boss portion 104.

[0041] In one embodiment of this utility model, along the length direction (long side direction) of the cover plate body 102, the boss portion 104 only covers the middle functional area of ​​the cover plate body 102 (such as the mounting position of the explosion-proof valve 120), and its two ends maintain a certain distance from the edge of the cover plate body 102, forming an extended segment. The surface of the extended segment is flat and serves as the mounting position for the upper plastic 106, which is connected to the upper plastic 106 by mold positioning or adhesive fixing. The length of the mounting position is adapted to the size of the upper plastic 106 to ensure that the upper plastic 106 completely covers the extended segment and does not overlap with the boss portion 104.

[0042] The shortened length of the boss portion 104 provides installation space for the upper plastic part 106, allowing the upper plastic part 106 to be distributed at both ends of the boss portion 104. This does not affect the heat dissipation function of the boss portion 104, and the shielding part 108 can isolate the boss portion 104 from the terminal post 110, balancing functional and structural requirements. The flat surface extending beyond the segment provides a stable installation base for the upper plastic part 106, reducing installation tilt caused by the protrusion of the boss portion 104, ensuring the accurate positioning of the shielding part 108, and reliable insulation isolation. The extended segment of the cover plate body 102 can also integrate structures such as the terminal post 110 mounting holes, allowing the upper plastic part 106, terminal post 110, and boss portion 104 to be orderly distributed along the length direction, improving the functional integration of the cell cover plate.

[0043] According to one embodiment of the present invention, a first mounting hole for mounting the pole post 110 is provided on the mounting position.

[0044] In one embodiment of this utility model, the first mounting hole penetrates the extended section (mounting position) of the cover plate body 102, and the hole diameter matches the outer diameter of the pole post 110. A clearance fit is used to facilitate the insertion of the pole post 110. After the pole post 110 passes through the first mounting hole, it is fixed by riveting or welding. Its bottom end is connected to the internal electrode tab of the battery cell, and its top end extends out of the surface of the cover plate body 102 and is connected to the external connecting piece 112. The edge of the first mounting hole corresponds to the shielding part 108 of the upper plastic 106, ensuring that the shielding part 108 can cover the gap between the pole post 110 and the boss part 104.

[0045] The first mounting hole provides a clear mounting reference for the terminal post 110, ensuring the accurate positioning of the terminal post 110 and the external connecting piece 112, and forming a preset distance with the boss portion 104, thus creating conditions for the isolation function of the shielding portion 108. The terminal post 110 is installed at the mounting position (both ends of the boss portion 104), and is distributed in sections with the boss portion 104. With the isolation of the shielding portion 108, the current transmission path (terminal post 110, external connecting piece 112) and the heat dissipation path (bore portion 104) are both independent and can work together through the water cooling plate without interfering with each other. The fit between the first mounting hole and the terminal post 110 can be further sealed by the sealing ring to prevent electrolyte leakage from the mounting gap. Combined with the cover of the upper plastic 106, the overall sealing performance of the cell cover is enhanced.

[0046] According to one embodiment of the present invention, the upper plastic 106 includes a positive electrode upper plastic 114 and a negative electrode upper plastic 116, which are symmetrically arranged about the center line of the width direction of the cover plate body 102.

[0047] In one embodiment of this utility model, the upper plastic 106 is divided into a positive electrode upper plastic 114 and a negative electrode upper plastic 116 according to the electrode function, and is respectively installed on both sides of the center line in the width direction of the cover plate body 102. The two are exactly the same in shape and size, and are only distinguished by electrode markings. Symmetry is ensured by integral molding. The shielding parts 108 of the positive electrode upper plastic 114 and the negative electrode upper plastic 116 are both oriented towards the center of the boss part 104, forming a symmetrical insulating barrier, which respectively isolates the positive electrode post 110 and the negative electrode post 110 from contact with the boss part 104.

[0048] The symmetrical arrangement ensures consistent structural parameters between the positive and negative electrodes, preventing uneven current distribution or heat dissipation differences caused by asymmetrical layout, and improving the balance of cell charging and discharging. The universal structure of the plastic 114 on the positive electrode and the plastic 116 on the negative electrode allows for the use of a single mold, reducing production costs. Simultaneously, the symmetrical layout facilitates rapid alignment during assembly, improving production efficiency. The symmetrical shielding portion 108 ensures that the insulation distance between the positive and negative electrodes and the boss portion 104 is the same, avoiding safety hazards caused by weak insulation on one side and making the insulation performance of the cell cover more reliable.

[0049] According to one embodiment of the present invention, a second mounting hole 118 is formed on the boss portion 104, and an explosion-proof valve 120 is installed in the second mounting hole 118.

[0050] In one embodiment of this utility model, a second mounting hole 118 is formed in the central region of the boss portion 104, penetrating the thickness direction of the cover plate body 102, and the hole diameter is adapted to the size of the explosion-proof valve 120. The explosion-proof valve 120 adopts a metal sheet or diaphragm structure and is fixed in the second mounting hole 118 by welding or sealant. Its burst pressure is preset to the safe threshold of the battery cell. The top surface of the explosion-proof valve 120 is flush with the top surface of the boss portion 104 to ensure that no additional pressure is applied to it when the water-cooling plate is attached.

[0051] The explosion-proof valve 120 on the boss portion 104 can rupture and release pressure in a timely manner when the internal pressure of the battery cell is abnormal, avoiding the risk of battery cell explosion. At the same time, the high rigidity structure of the boss portion 104 provides a stable mounting base for the explosion-proof valve 120, ensuring its precise burst pressure. The integrated design of the explosion-proof valve 120 and the boss portion 104 allows the water-cooling plate to dissipate heat from the boss portion 104 without affecting the normal operation of the explosion-proof valve 120. The two functions are independent but can achieve structural synergy through the boss portion 104. By placing the explosion-proof valve 120 on the boss portion 104, it is unnecessary to make separate openings in other areas of the cover plate body 102, making the structure of the battery cell cover plate more compact and reserving more space for components such as the terminal post 110 and the upper plastic 106.

[0052] According to one embodiment of the present invention, a protective patch 122 is provided on the side of the explosion-proof valve 120 opposite to the second mounting hole 118.

[0053] In one embodiment of this invention, the protective patch 122 is made of a high-temperature resistant insulating material (such as polyimide film) and is bonded to the side of the explosion-proof valve 120 facing away from the second mounting hole 118 (i.e., the side facing the water-cooling plate). The area of ​​the protective patch 122 is slightly larger than that of the explosion-proof valve 120, and its edge extends to the top surface of the boss portion 104, so that it can completely cover the explosion-proof valve 120 without affecting the adhesion between the boss portion 104 and the water-cooling plate. The protective patch 122 has a certain degree of flexibility and can break during the explosion of the explosion-proof valve 120 without hindering the pressure relief.

[0054] Protective patch 122 isolates the explosion-proof valve 120 from the water-cooled plate, preventing scratches or pressure on the surface of the explosion-proof valve 120 during installation or vibration, ensuring the integrity of the explosion-proof valve 120 and the stability of its burst pressure. The insulating properties of protective patch 122 further isolate the explosion-proof valve 120 (metal material) from the water-cooled plate (potentially conductive), avoiding the risk of short circuits caused by condensation on the surface of the explosion-proof valve 120 and improving overall insulation performance. The material strength of protective patch 122 is lower than the burst pressure of the explosion-proof valve 120; it can rupture synchronously when the explosion-proof valve 120 actuates, ensuring smooth release of internal pressure without obstructing the safe pressure relief path.

[0055] According to one embodiment of the present invention, along the width direction of the cover plate body 102, the width of the blocking portion 108 is greater than or equal to the width of the boss portion 104, and the width of the blocking portion 108 is less than or equal to the width of the cover plate body 102.

[0056] In one embodiment of this utility model, the width of the shielding portion 108 along the width direction of the cover plate body 102 is designed to satisfy the following: at least the same width as the boss portion 104, ensuring complete coverage of the width range of the boss portion 104 to form a comprehensive insulation barrier; and not exceeding the width of the cover plate body 102 to avoid assembly interference caused by extending beyond the edge of the cover plate body 102. The width of the shielding portion 108 is precisely controlled by the mold and matched in coordination with the width of the boss portion 104 and the cover plate body 102 to ensure no insulation blind spots in the width direction.

[0057] The width of the shielding portion 108 is greater than or equal to the width of the boss portion 104, allowing it to completely cover the boss portion 104 in the width direction. This avoids side insulation gaps caused by an excessively wide boss portion 104, ensuring that the boss portion 104 of the cover body 102 and the outer connecting piece 112 are isolated at any width position. The width of the shielding portion 108 is less than or equal to the width of the cover body 102, preventing it from exceeding the cover body 102 and causing assembly conflicts with the housing or other components. This ensures that the cell cover can be smoothly installed on the battery housing without affecting the overall structural layout. Reasonable limitation of the width parameter avoids material waste caused by an excessively wide shielding portion 108, controlling the weight and cost of the upper plastic 106 while ensuring insulation performance.

[0058] A second aspect of this utility model provides a battery, including a housing, on which a cell cover plate as described above is disposed.

[0059] According to the battery provided in the second aspect of this utility model, the protrusion 104 of the cell cover is designed to allow efficient heat dissipation from the top of the battery through a water-cooling plate, which works in conjunction with the heat dissipation from the side wall of the casing. This solves the problem of weak heat dissipation at the top of traditional batteries, effectively reducing temperature accumulation in the cell during charging and discharging, and maintaining stable battery temperature, especially under high-rate conditions. The sealed fit between the cell cover and the casing ensures that the electrolyte will not leak, while the integrated design of the explosion-proof valve 120 allows for rapid pressure relief when the internal pressure of the battery is abnormal, preventing the casing from rupturing due to overpressure. The insulating isolation effect of the upper plastic shield 106 reduces the risk of short circuit between the terminal post 110 and the cover body 102, indirectly improving the electrical safety of the battery. The compact design of the cell cover (such as the coplanar layout of the protrusion 104 and the terminal post 110) reduces the space occupied at the top of the battery, allowing more cell material to be accommodated inside the casing, increasing battery capacity within the same volume. At the same time, the standardized cover size facilitates adaptation to casings of different specifications, enhancing versatility. The efficient heat dissipation system reduces the aging effects of temperature fluctuations on cell materials, especially significantly protecting the stability of electrode materials and electrolyte. The reliable sealing structure reduces the probability of electrolyte evaporation or deterioration, and combined with the stability of insulation, extends the battery's cycle life. The standardized fit design of the cell cover and casing allows for automated assembly (such as laser welding), reducing manual steps. Furthermore, components integrated into the cover, such as the terminal post 110 and explosion-proof valve 120, do not require separate openings in the casing, reducing production complexity.

[0060] The battery provided in the second aspect of this utility model achieves structural integration and functional synergy through the adaptation design of the casing and the aforementioned cell cover plate.

[0061] The casing is made of metal (such as aluminum) or high-strength plastic, and has a rectangular or cylindrical structure with one open end, forming an internal cavity to accommodate the battery cells. A sealing groove is provided at the edge of the open end of the casing to cooperate with the battery cell cover plate for sealing. The side walls of the casing can be designed with heat dissipation fins or have pre-reserved water-cooling channel interfaces according to heat dissipation requirements.

[0062] The cell cover adopts the structure described in the above embodiments, including a lower plastic 100, a cover body 102, an upper plastic 106, and matching components such as a terminal post 110 and an explosion-proof valve 120. The edge of the cell cover matches the sealing groove at the opening end of the casing and is fixed by laser welding or sealant to form a top sealing structure of the battery.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell cover plate, characterized in that, include: Plastic bottom; The cover plate body has a first side mounted on the lower plastic, and a second side formed with a boss protruding in a direction away from the lower plastic. An upper plastic is disposed on the cover body along the length of the cover body and located at both ends of the protrusion portion. At least one side of the upper plastic near the protrusion portion has a blocking portion that protrudes in a direction away from the lower plastic.

2. The cell cover plate according to claim 1, characterized in that, Along the thickness direction of the cover plate body, the height of the boss portion is equal to the sum of the height of the pole post and the height of the outer connecting piece.

3. The cell cover plate according to claim 1, characterized in that, Along the thickness direction of the cover plate body, the height of the blocking portion is the same as the height of the boss portion.

4. The cell cover plate according to claim 1, characterized in that, Along the length of the cover plate body, the length of the boss portion is less than the length of the cover plate body, and mounting positions for mounting the upper plastic are formed on the segment of the cover plate body that extends beyond the boss portion.

5. The cell cover plate according to claim 4, characterized in that, The mounting position has a first mounting hole for mounting the pole post.

6. The cell cover plate according to claim 4, characterized in that, The upper plastic includes a positive electrode upper plastic and a negative electrode upper plastic, which are symmetrically arranged about the center line of the width direction of the cover plate body.

7. The cell cover plate according to any one of claims 1 to 6, characterized in that, A second mounting hole is formed on the boss portion, and an explosion-proof valve is installed in the second mounting hole.

8. The cell cover plate according to claim 7, characterized in that, A protective patch is provided on the side of the explosion-proof valve opposite to the second mounting hole.

9. The cell cover plate according to any one of claims 1 to 6, characterized in that, Along the width direction of the cover plate body, the width of the blocking portion is greater than or equal to the width of the boss portion, or the width of the blocking portion is less than or equal to the width of the cover plate body.

10. A battery, characterized in that, It includes a housing, on which a cell cover plate as described in any one of claims 1 to 9 is provided.

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