Battery cover, battery and battery pack

Abstract

The present invention provides a battery cover, a battery and a battery pack. The battery cover comprises a stop frame (1) and a connection unit (11), the stop frame (1) is provided with a groove (7), the connection unit (11) comprises a pole (111) and a connection plate (112), the pole (111) is provided at a first end of the connection plate (112), and the connection unit (11) is at least partially accommodated in the groove (7). The battery cover provided by the present invention can solve the problem that the existing cover occupies a large internal space of the battery and has a low space utilization rate, so that the battery and battery pack using the battery cover have a higher energy density and improved battery life.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cover, a battery and a battery pack. Background Art

[0002] Lithium-ion batteries have become core components in modern electronic devices, electric vehicles, and renewable energy storage systems due to their high energy density, long cycle life, and lightweight characteristics. In these fields, battery performance is directly related to product competitiveness and user experience. As a common packaging form, square-shell lithium-ion batteries are widely used in laptops, power tools, and even large-scale energy storage systems. Their unique geometry allows for high flexibility and stability in specific application scenarios, such as the battery pack layout of electric vehicles.

[0003] The existing square shell lithium-ion battery cover mainly includes components such as metal substrate, explosion-proof valve, pole ear, pole column, stop frame and sealing ring. Among them, the metal substrate provides structural support, the explosion-proof valve is used to release gas when the internal pressure of the battery is abnormal, the pole ear and pole column are responsible for the electrical connection of the battery, and the stop frame is used to fix the components and maintain internal insulation. However, in these cover designs, the pole ear and pole column are welded through a connecting piece. Because of the extra volume of the connecting piece and the stop frame, the internal space of the battery is significantly occupied, thereby reducing the space utilization rate. This is a bottleneck problem that needs to be solved urgently for battery designs that pursue higher energy density and longer battery life. Summary of the invention

[0004] The main purpose of the present invention is to provide a battery cover, a battery and a battery pack, which solves the problem that the existing cover occupies a large internal space of the battery and has low space utilization.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a battery cover is provided, including a stop frame and a connecting unit, the stop frame is provided with a groove, the connecting unit includes a pole and a connecting plate, the pole is provided at a first end of the connecting plate, and the connecting unit is at least partially accommodated in the groove, thereby solving the problem that the existing cover occupies a large internal space of the battery and has low space utilization.

[0006] Furthermore, a vent is provided in the groove, and the plane where the highest point of the vent is located is flush with or lower than the top surface of the protruding area around the groove, thereby ensuring the overall flatness of the battery cover and reducing the top space occupied.

[0007] Furthermore, the exhaust portion includes a first protrusion and a second protrusion, the first protrusion and the second protrusion are both arranged in the groove, a first exhaust channel is arranged in the first protrusion, a second exhaust channel is arranged in the second protrusion, a third exhaust channel is arranged in the protruding area, and the second exhaust channel connects the first exhaust channel and the third exhaust channel. By arranging the exhaust channel inside the protrusion, the internal gas of the battery is guided to circulate in the exhaust channel and gather at the explosion-proof valve for exhaust and pressure relief.

[0008] Furthermore, an air inlet hole is provided on the first protrusion, so that the gas inside the battery can enter the first exhaust channel through the air inlet hole on the first protrusion.

[0009] Furthermore, an air inlet hole is provided on the second protruding portion, so that the gas inside the battery can enter the second exhaust channel through the air inlet hole on the second protruding portion.

[0010] Furthermore, an air inlet hole is provided on the protruding area, and a plurality of the air inlet holes are arranged at intervals, so that the gas inside the battery can enter the third exhaust channel through the air inlet holes on the protruding area.

[0011] Furthermore, the battery cover plate also includes a mounting hole, a second end of the connecting plate is provided with an avoidance groove, the mounting hole includes a first mounting hole, the bottom of the groove is a bottom plate, the first mounting hole is arranged on the bottom plate, the pole is inserted into the first mounting hole, and the avoidance groove can accommodate the first protrusion. By providing the avoidance groove, interference between the connecting plate and the first protrusion is avoided, resulting in the connecting plate and the pole being unable to be properly installed and fixed.

[0012] Furthermore, the pole includes a top plate and a side plate, one end of the side plate is connected to the connecting plate, and the other end is connected to the top plate, a pole hole is provided at one end of the pole connected to the connecting plate, a deformation portion is provided at the open end of the pole, a first thermistor is provided on the side of the top plate facing the deformation portion, and a second thermistor is provided on the side of the deformation portion facing the top plate, in the default state, the deformation portion can make a movable gap between the second thermistor and the first thermistor, and in the protection state, the deformation portion can deform toward the top plate, so that the second thermistor is crimped onto the first thermistor. By providing the first thermistor and the second thermistor, the current passing through the pole can be limited in the case of thermal runaway, which plays a role in preventing the battery from further overheating or short circuiting, thereby improving the safety of the battery.

[0013] Furthermore, the mounting hole includes a positive electrode mounting hole and a negative electrode mounting hole, and the positive electrode mounting hole and the negative electrode mounting hole are respectively arranged on both sides of the exhaust part. The connection unit includes a positive electrode connection unit and a negative electrode connection unit, and the positive electrode connection unit is arranged in the positive electrode mounting hole, and the negative electrode connection unit is arranged in the negative electrode mounting hole, so as to avoid cross interference between the electrical components and the exhaust channel, and ensure the convenience and stability of the electrical connection while keeping the battery cover plate compact.

[0014] Furthermore, a sealing ring is provided on the pole, and the sealing ring is between the connecting plate and the bottom plate to prevent the electrolyte inside the battery from leaking, and at the same time prevent external moisture, dust, etc. from entering the battery, avoiding battery short circuit and performance degradation.

[0015] Furthermore, the battery cover also includes a substrate, which is arranged on a side of the bottom plate away from the groove, and a second mounting hole is arranged on the substrate. The second mounting hole is arranged at a position corresponding to the first mounting hole, and the size of the second mounting hole is consistent with the first mounting hole. The pole is passed through the first mounting hole and the second mounting hole to prevent the electrical connection of the pole from loosening due to vibration or external impact, while ensuring the accuracy of the battery cover assembly, which helps to improve the production quality and efficiency of the battery.

[0016] Furthermore, an explosion-proof valve is provided on the substrate, and the explosion-proof valve is provided corresponding to the exhaust part. A connecting airway is provided on the bottom plate, one end of the connecting airway is connected to the exhaust part, and the other end faces the explosion-proof valve. When the internal pressure of the battery begins to rise, the gas can be guided from the exhaust part to the explosion-proof valve. Once the pressure exceeds the threshold, the gas will be discharged directly through the explosion-proof valve, thereby improving the safety of the battery.

[0017] Furthermore, the battery cover also includes a plastic sealing cap, which is covered on the pole from the side of the base plate away from the stop frame to prevent the pole from contacting with metal or conductive objects outside the battery, avoiding short circuits or electric shock accidents caused by external factors, and improving the safety of battery use.

[0018] Furthermore, a heat-conducting layer is provided between the stop frame and the base plate, a third mounting hole and an explosion-proof hole are provided on the heat-conducting layer, the third mounting hole is provided at a position corresponding to the first mounting hole, the third mounting hole is provided with a size consistent with the first mounting hole, an explosion-proof valve is provided on the base plate, the explosion-proof hole is provided corresponding to the explosion-proof valve, and the pole is provided in the first mounting hole, the second mounting hole and the third mounting hole. The heat-conducting layer can significantly improve the heat conduction capacity of the battery cover plate, help the battery maintain a stable operating temperature in high current charging and discharging or high temperature environment, thereby improving the performance of the battery and extending its service life.

[0019] According to another aspect of the present invention, a battery is provided, comprising a battery cover, wherein the battery cover is the above-mentioned battery cover.

[0020] According to another aspect of the present invention, there is further provided a battery pack, comprising a battery, wherein the battery is the battery described above.

[0021] By applying the technical solution of the present invention, the stop frame is mainly used to provide support and positioning for the internal components of the battery, and also plays the role of insulation and preventing short circuits. The groove is used to accommodate the connection unit and other components, and the connection unit is at least partially accommodated in the groove, reducing the direct occupation of the available space inside the battery by the connection unit. The connection unit is composed of a pole and a connecting plate. The pole is the part on the battery cover that is directly electrically connected to the external circuit, and the connecting plate is used to weld with the pole ear inside the battery to achieve electrical connection between the battery cell and the pole. The battery cover proposed by the present invention, by providing a groove, at least partially accommodates the connection unit in the groove, reducing the space occupied by the connection unit inside the battery, thereby solving the problem that the existing cover occupies a large space inside the battery and has low space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 An exploded view of a battery cover according to an embodiment of the present invention is shown;

[0024] Figure 2 An axonometric view of a stop bracket of a battery cover plate according to an embodiment of the present invention is shown;

[0025] Figure 3 A bottom view of a battery cover according to an embodiment of the present invention is shown;

[0026] Figure 4 An axonometric view showing a connection unit of a battery cover according to an embodiment of the present invention;

[0027] Figure 5 A cross-sectional view of a pole of a battery cover according to an embodiment of the present invention is shown;

[0028] Figure 6 A cross-sectional view showing a stopper frame of a battery cover according to an embodiment of the present invention.

[0029] The above drawings include the following reference numerals:

[0030] 1. Stop frame; 2. Base plate; 21. Second mounting hole; 22. Explosion-proof valve; 3. Heat-conducting layer; 31. Third mounting hole; 32. Explosion-proof hole; 4. Plastic sealing cap; 5. Bottom plate; 6. Protruding area; 7. Groove; 8. Exhaust part; 81. First protruding part; 82. Second protruding part; 83. First exhaust channel; 84. Second exhaust channel; 85. Third exhaust channel; 9. Air inlet; 10. Mounting hole; 1 01. first mounting hole; 102. positive electrode mounting hole; 103. negative electrode mounting hole; 11. connection unit; 111. pole; 112. connection plate; 113. avoidance groove; 1111. top plate; 1112. side plate; 1113. pole hole; 1114. deformation part; 1115. first thermistor; 1116. second thermistor; 12. sealing ring; 13. connecting airway; 14. injection hole. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] See also Figures 1 to 6 As shown, the present invention provides a battery cover, including a stop frame 1 and a connecting unit 11, the stop frame 1 is provided with a groove 7, the connecting unit 11 includes a pole 111 and a connecting plate 112, the pole 111 is arranged at a first end of the connecting plate 112, and the connecting unit 11 is at least partially accommodated in the groove 7.

[0033] In the above technical solution, the stop frame 1 is mainly used to provide support and positioning for the internal components of the battery, and also plays the role of insulation and short circuit prevention. The groove 7 is used to accommodate the connection unit 11 and other components. The connection unit 11 is at least partially accommodated in the groove 7, reducing the direct occupation of the available space inside the battery by the connection unit 11. The connection unit is composed of a pole 111 and a connecting plate 112. The pole 111 is the part of the battery cover that is directly electrically connected to the external circuit, and the connecting plate 112 is used to weld with the pole ear inside the battery to achieve electrical connection between the battery cell and the pole 111. The battery cover proposed by the present invention, by providing a groove 7, at least partially accommodates the connection unit 11 in the groove 7, reducing the space occupied by the connection unit 11 inside the battery, thereby solving the problem that the existing cover occupies a large internal space of the battery and has low space utilization.

[0034] In one embodiment of the present invention, a vent portion 8 is provided in the groove 7 , and the plane where the highest point of the vent portion 8 is located is flush with or lower than the top surface of the protruding area 6 on the peripheral side of the groove 7 .

[0035] In the above technical solution, the groove 7 is used to accommodate the connection unit 11 and the exhaust part 8 on the battery cover, so as to improve the utilization rate of the internal space of the cover and reduce the occupation of the battery cover to the internal space of the battery. The exhaust part 8 is used to quickly release the gas and heat generated inside the battery when the battery is thermally runaway, overcharged or the internal pressure increases, so as to prevent the internal pressure of the battery from being too high and exploding. The highest point of the exhaust part 8 is designed to be flush with or lower than the top surface of the protruding area 6 on the side of the groove 7, in order to ensure the overall flattening of the battery cover, reduce the occupation of the top space, and ensure that the gas inside the battery is discharged smoothly, and the discharge will not be blocked due to the height of the exhaust part 8. The protruding area 6 is a structure surrounding the groove 7 on the stop frame 1, and its design height matches the highest point of the exhaust part 8, so that the top structure of the entire battery cover is consistent, and no additional height is added due to the setting of the exhaust part, thereby saving the internal space of the battery to the greatest extent and improving the utilization rate of the internal space of the battery.

[0036] In one embodiment of the present invention, the exhaust portion 8 includes a first protrusion 81 and a second protrusion 82, both of which are arranged in the groove 7, a first exhaust channel 83 is arranged in the first protrusion 81, a second exhaust channel 84 is arranged in the second protrusion 82, a third exhaust channel 85 is arranged in the protruding area 6, and the second exhaust channel 84 connects the first exhaust channel 83 and the third exhaust channel 85.

[0037] In the above technical solution, the exhaust portion 8 is used to quickly release the gas and heat generated inside the battery when the battery has thermal runaway, overcharge or internal pressure increases, so as to reduce the risk of explosion caused by excessive internal pressure of the battery. The exhaust portion 8 includes a first protrusion 81 and a second protrusion 82. The first protrusion 81 and the second protrusion 82 are both arranged in the groove 7, making full use of the space area in the groove 7 to avoid adding additional volume to occupy the internal space of the battery. The protruding structure of the first protrusion 81 and the second protrusion 82 not only helps to form a gas discharge path, but also realizes gas management through the exhaust channel inside it. When a large amount of gas is generated in the case of thermal runaway inside the battery, the gas can enter the first exhaust channel 83, the second exhaust channel 84 and the third exhaust channel 85 through the first protrusion 81 and the second protrusion 82 and the air inlet 9 on the protruding area 6. The second exhaust channel 84 connects the first exhaust channel 83 and the third exhaust channel 85, so that the gas can flow in the exhaust channel and gather to the explosion-proof valve 22 for exhaust and pressure relief.

[0038] In one embodiment of the present invention, an air inlet hole 9 is provided on the first protrusion 81 .

[0039] In the above technical solution, the air inlet hole 9 on the first protrusion 81 is used to connect the internal space where the battery cell is located with the first exhaust channel 83. When a large amount of gas is generated due to thermal runaway or the like inside the battery, the gas can enter the first exhaust channel 83 through the air inlet hole 9 on the first protrusion 81.

[0040] In one embodiment of the present invention, an air inlet hole 9 is provided on the second protrusion 82 .

[0041] In the above technical solution, the air inlet hole 9 on the second protrusion 82 is used to connect the internal space where the battery cell is located with the second exhaust channel 84. When a large amount of gas is generated due to thermal runaway or other conditions inside the battery, the gas can enter the second exhaust channel 84 through the air inlet hole 9 on the second protrusion 82.

[0042] In one embodiment of the present invention, air inlet holes 9 are provided on the protruding area 6, and a plurality of air inlet holes 9 are arranged at intervals.

[0043] In the above technical solution, the air inlet hole 9 on the protruding area 6 is used to connect the internal space where the battery cell is located with the third exhaust channel 85. When a large amount of gas is generated due to thermal runaway or other conditions inside the battery, the gas can enter the third exhaust channel 85 through the air inlet hole 9 on the protruding area 6.

[0044] In one embodiment of the present invention, the battery cover plate also includes a mounting hole 10, a second end of the connecting plate 112 is provided with an avoidance groove 113, the mounting hole 10 includes a first mounting hole 101, the bottom of the groove 7 is a base plate 5, the first mounting hole 101 is arranged on the base plate 5, the pole 111 is passed through the first mounting hole 101, and the avoidance groove 113 can accommodate the first protrusion 81.

[0045] In the above technical solution, the mounting hole 10 is used to accommodate the pole 111, and to position and fix the pole 111. A plurality of mounting holes 10 are distributed on different layers, wherein the mounting hole provided on the bottom plate 5 is the first mounting hole 101, through which the pole 111 can pass through the bottom plate 5 and be firmly mounted on the stop frame 1. An avoidance groove 113 is designed at the second end of the connecting plate 112, the main purpose of which is to provide space for the first protrusion 81, to avoid interference between the connecting plate 112 and the first protrusion 81, and to prevent the connecting plate 112 and the pole 111 from being properly installed and fixed.

[0046] In one embodiment of the present invention, the pole 111 includes a top plate 1111 and a side plate 1112, one end of the side plate 1112 is connected to the connecting plate 112, and the other end is connected to the top plate 1111, the end of the pole 111 connected to the connecting plate 112 is provided with a pole hole 1113, the open end of the pole 111 is provided with a deformation portion 1114, a first thermistor 1115 is provided on the side of the top plate 1111 facing the deformation portion 1114, and a second thermistor 1116 is provided on the side of the deformation portion 1114 facing the top plate 1111. In the default state, the deformation portion 1114 can allow a movable gap to exist between the second thermistor 1116 and the first thermistor 1115, and in the protection state, the deformation portion 1114 can be deformed toward the top plate 1111, so that the second thermistor 1116 is crimped onto the first thermistor 1115.

[0047] In the above technical solution, the top plate 1111 and the side plate 1112 constitute the main structure of the pole 111, which not only provide physical support for the positive and negative poles of the battery, but also the side plate 1112 ensures a stable electrical connection between the pole ear led out from the inside of the battery and the pole 111 through the connection with the connecting plate 112. The pole hole 1113 is used to connect the internal space of the pole 111. The deformation part 1114 is a structure made of insulating material that can be deformed under specific conditions. Under normal working conditions, the deformation part 1114 remains unchanged and has no overcurrent capacity, which will not affect the normal use of the battery. However, when the temperature inside the battery rises abnormally and thermal runaway occurs, the deformation part 1114 will deform toward the top plate 1111 under the action of heat or the push of gas pressure, thereby triggering a protection mechanism related to thermistor. A thermistor is a temperature-sensitive electronic component that can change its resistance value with temperature changes. In the default state, there is an active gap between the first thermistor 1115 and the second thermistor 1116, which will not affect the normal passage of current. However, in the protection state, when the deformation portion 1114 is deformed, the second thermistor 1116 will be pressed onto the first thermistor 1115 to form a whole. Since the temperature inside the battery is abnormally high at this time, the resistance of the thermistor will increase significantly, causing the overall resistance of the pole part to increase greatly in a short time, thereby limiting the current passing through the pole 111, and preventing the battery from further overheating or short circuiting.

[0048] In one embodiment of the present invention, the mounting hole 10 includes a positive electrode mounting hole 102 and a negative electrode mounting hole 103, and the positive electrode mounting hole 102 and the negative electrode mounting hole 103 are respectively arranged on both sides of the exhaust portion 8, and the connection unit 11 includes a positive electrode connection unit and a negative electrode connection unit, and the positive electrode connection unit is arranged in the positive electrode mounting hole 102, and the negative electrode connection unit is arranged in the negative electrode mounting hole 103.

[0049] In the above technical solution, the positive electrode mounting hole 102 and the negative electrode mounting hole 103 are used to install the positive electrode connection unit and the negative electrode connection unit respectively. By setting the mounting holes 10 on both sides of the exhaust portion 8, cross interference between the electrical components and the exhaust channel can be avoided, and the convenience and stability of the electrical connection can be ensured while maintaining the compact structure of the battery cover. The connection unit 11 is an electrical interface on the battery cover. The connection unit 11 is obtained by integrating the pole 111 and the connecting plate 112, so that the current generated inside the battery can be safely and efficiently exported to the external circuit, and the internal space of the battery occupied by the independent pole 111 and the connecting plate 112 can be reduced.

[0050] In one embodiment of the present invention, a sealing ring 12 is sleeved on the pole 111 , and the sealing ring 12 is between the connecting plate 112 and the bottom plate 5 .

[0051] In the above technical solution, the sealing ring 12 is an annular component placed on the pole 111, usually made of elastic material, such as rubber or silicone, etc. It plays a sealing role between the connecting plate 112 and the bottom plate 5 to prevent the electrolyte inside the battery from leaking, and at the same time prevents external moisture, dust, etc. from entering the battery, avoiding battery short circuit and performance degradation.

[0052] In one embodiment of the present invention, the battery cover also includes a substrate 2, which is arranged on the side of the bottom plate 5 away from the groove 7, and a second mounting hole 21 is arranged on the substrate 2. The setting position of the second mounting hole 21 corresponds to the first mounting hole 101, and the size of the second mounting hole 21 is consistent with the first mounting hole 101. The pole 111 is penetrated in the first mounting hole 101 and the second mounting hole 21.

[0053] In the above technical solution, the substrate 2 is another layer of supporting structure of the battery cover, which is located on the side of the bottom plate away from the groove. The substrate 2 is usually made of insulating materials, such as plastic or ceramic, and its main function is to provide additional electrical insulation and mechanical support, prevent the internal components of the battery from directly contacting the metal shell, avoid electrical faults such as short circuits, and enhance the overall structural strength of the battery cover to ensure the stability and durability of the cover during the use of the battery. A second mounting hole 21 is provided on the substrate 2, and its setting position corresponds to the first mounting hole 101 on the bottom plate 5, and the size is also consistent. The existence of the second mounting hole 21 enables the pole 111 to pass through the bottom plate 5 and the substrate 2 at the same time, thereby realizing the double fixation of the pole 111 on the battery cover. This design improves the stability of the pole 111 and avoids the loosening of the electrical connection caused by vibration or external impact. At the same time, the alignment of the second mounting hole 21 with the first mounting hole 101 also ensures the accuracy of the battery cover assembly, which helps to improve the production quality and efficiency of the battery. After the pole passes through the first mounting hole 101 and the second mounting hole 21, it can be fixed in a variety of ways, such as injection molding, welding, or using fasteners. This double fixing method not only ensures a good electrical connection between the pole 111 and the internal components of the battery, but also enhances the mechanical stability of the pole 111, preventing the pole 111 from being displaced or damaged due to changes in the internal pressure of the battery or external environmental factors.

[0054] In one embodiment of the present invention, an explosion-proof valve 22 is also provided on the substrate 2, and the explosion-proof valve 22 is arranged corresponding to the exhaust part 8. A connecting air duct 13 is provided on the bottom plate 5, one end of the connecting air duct 13 is connected to the exhaust part 8, and the other end faces the explosion-proof valve 22.

[0055] In the above technical solution, the explosion-proof valve 22 is a pressure release device. When the internal pressure of the battery exceeds a predetermined threshold, the explosion-proof valve 22 will automatically open and release the internal pressure to prevent the battery from exploding due to overpressure. It usually includes one or more thin film sheets that remain sealed under normal pressure, but will rupture when the pressure rises abnormally, thereby providing a gas discharge path. The exhaust portion 8 is used to effectively guide the gas discharge and avoid internal pressure accumulation when the battery generates gas internally under conditions such as overcharging and thermal runaway. The exhaust portion 8 includes a plurality of exhaust channels, such as a first exhaust channel 83, a second exhaust channel 84, and a third exhaust channel 85. The design of these channels ensures that the gas can be discharged along the optimal path while reducing the impact of the airflow on the internal components of the battery. The connecting airway 13 is an internal channel on the bottom plate 5, one end of which is connected to the exhaust portion 8 and the other end points to the explosion-proof valve 22. The function of this design is to guide the gas from the exhaust portion 8 to the explosion-proof valve 22 when the internal pressure of the battery begins to rise. Once the pressure exceeds the threshold, the gas will be discharged directly through the explosion-proof valve 22.

[0056] In one embodiment of the present invention, the battery cover further includes a plastic sealing cap 4 , which is disposed on the pole 111 from a side of the base plate 2 facing away from the stop frame 1 .

[0057] In the above technical solution, the plastic cap 4 is a protective cap made of insulating material, which can prevent the pole 111 from contacting with metal or conductive objects outside the battery, avoid short circuit or electric shock accidents caused by external factors, and improve the safety of battery use. At the same time, the plastic cap 4 can protect the top of the pole 111 from mechanical damage, such as crushing, wear or collision, to ensure the structural integrity of the pole 111 during battery use.

[0058] In one embodiment of the present invention, a heat-conducting layer 3 is arranged between the stop frame 1 and the substrate 2, and a third mounting hole 31 and an explosion-proof hole 32 are arranged on the heat-conducting layer 3. The setting position of the third mounting hole 31 corresponds to the first mounting hole 101, and the size of the third mounting hole 31 is consistent with the first mounting hole 101. An explosion-proof valve 22 is also arranged on the substrate 2, and the explosion-proof hole 32 corresponds to the explosion-proof valve 22. The pole 111 is penetrated into the first mounting hole 101, the second mounting hole 21 and the third mounting hole 31.

[0059] In the above technical solution, the heat-conducting layer 3 is a material layer with high thermal conductivity, which is arranged between the stop frame 1 and the substrate 2 to improve the conduction of heat inside the battery and accelerate the heat dissipation process of the battery. The introduction of the heat-conducting layer 3 can significantly improve the thermal conductivity of the battery cover, help the battery maintain a stable operating temperature under high current charging and discharging or high temperature environment, thereby improving the performance of the battery and extending its service life. In addition, the heat-conducting layer 3 can also prevent the winding core or stacked core from directly contacting the cover, reducing the risk of internal short circuit, thereby improving the safety performance of the battery. The setting position of the third mounting hole 31 corresponds to the first mounting hole 101, and its size is also consistent with the first mounting hole 101, which is to ensure that the pole 111 can pass through the stop frame 1, the substrate 2 and the mounting hole 10 on the heat-conducting layer 3 at the same time, so as to achieve a stable electrical connection and a good heat conduction path. The design of the pole 111 passing through multiple mounting holes 10 not only strengthens the fixation of the pole 111, but also ensures good contact between the pole 111 and the heat-conducting layer 3, thereby improving the heat conduction efficiency. The explosion-proof hole 32 is arranged on the heat-conducting layer 3, corresponding to the explosion-proof valve 22 on the substrate 2. When the internal pressure of the battery increases abnormally, the explosion-proof valve 22 will open, and the explosion-proof hole 32 provides a channel for the flow of air, so that the high-pressure gas generated inside the battery can be quickly discharged through the explosion-proof hole 32, avoiding the battery from exploding due to excessive internal pressure.

[0060] In one embodiment of the present invention, the substrate 2, the bottom plate 5 and the heat-conducting layer 3 are all provided with injection holes 14, and the injection holes 14 on each layer are interconnected.

[0061] In the above technical solution, the injection hole 14 is used to inject electrolyte after the battery is assembled. By providing interconnected injection holes 14 on the substrate 2, the bottom plate 5 and the heat-conducting layer 3, it can be ensured that the electrolyte can directly and unobstructedly reach every corner of the battery when injected, avoiding the situation where the battery performance is affected by uneven distribution of the electrolyte.

[0062] In one embodiment of the present invention, the pole 111 and the connecting plate 112 are integrally formed.

[0063] In the above technical solution, the traditional pole 111 and the connecting plate 112 are independent components and need to be fixed together by welding or other connection methods. This assembly step is eliminated through one-piece molding, which reduces the difficulty of assembling the battery cell structure, saves assembly time, and improves production efficiency. In addition, by integrally molding the pole 111 and the connecting plate 112, the number of welding times between the pole 111 and the connecting plate 112 is reduced, the current capacity is improved, and the pole 111 and the connecting plate 112 can withstand a larger current, preventing the pole 111 and the connecting plate 112 from overheating or melting during high current charging and discharging.

[0064] See also Figures 1 to 6 As shown, the present invention further provides a battery, including a battery cover, and the battery cover is the battery cover of the above embodiment.

[0065] In the above technical solution, the battery made of the battery cover in the above embodiment has a larger available space inside the battery, thereby increasing the volume of the battery cells that the battery can accommodate, and further increasing the energy density of the battery, so that a single battery has a larger storage capacity.

[0066] See also Figures 1 to 6 As shown, the present invention also provides a battery pack, including a battery, and the battery is the battery of the above embodiment.

[0067] In the above technical solution, the battery in the above embodiment is used to significantly improve the energy density of the battery pack, and further increase the capacity of the battery pack without changing the volume, thereby having a better battery life.

[0068] From the above description, it can be seen that the above-mentioned embodiment of the present invention achieves the following technical effects: the stop frame 1 is mainly used to provide support and positioning for the internal components of the battery, and also plays the role of insulation and preventing short circuits. The groove 7 is used to accommodate the connection unit 11 and other components. The connection unit 11 is at least partially accommodated in the groove 7, reducing the direct occupation of the connection unit 11 on the available space inside the battery. The connection unit is composed of a pole 111 and a connecting plate 112. The pole 111 is the part on the battery cover that is directly electrically connected to the external circuit, and the connecting plate 112 is used to weld with the pole ear inside the battery to achieve electrical connection between the battery cell and the pole 111. The battery cover proposed by the present invention, by setting the groove 7, at least partially accommodates the connection unit 11 in the groove 7, reduces the space occupied by the connection unit 11 inside the battery, and solves the problem that the existing cover occupies a large internal space of the battery and the space utilization rate is low, so that the battery and battery pack using the battery cover have higher energy density and improved endurance.

[0069] Obviously, the above described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0070] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery cover, characterized in that: The invention comprises a stop frame (1) and a connection unit (11), wherein the stop frame (1) is provided with a groove (7), the connection unit (11) comprises a pole (111) and a connection plate (112), the pole (111) is provided at a first end of the connection plate (112), and the connection unit (11) is at least partially accommodated in the groove (7).

2. The battery cover according to claim 1, characterized in that: The groove (7) is provided with an exhaust portion (8), the plane where the highest point of the exhaust portion (8) is located is flush with or lower than the top surface of the protruding area (6) on the peripheral side of the groove (7); and / or the exhaust portion (8) comprises a first protruding portion (81) and a second protruding portion (82), the first protruding portion (81) and the second protruding portion (82) are both provided in the groove (7), a first exhaust channel (83) is provided in the first protruding portion (81), a second exhaust channel (84) is provided in the second protruding portion (82), a third exhaust channel (85) is provided in the protruding area (6), and the second exhaust channel (84) connects the first exhaust channel (83) with the third exhaust channel (85).

3. The battery cover according to claim 2, characterized in that: The first protruding portion (81) is provided with an air inlet hole (9); And / or, the second protruding portion (82) is provided with an air inlet hole (9).

4. The battery cover according to claim 2, characterized in that: The protruding area (6) is provided with an air inlet hole (9), and a plurality of the air inlet holes (9) are arranged at intervals; and / or the battery cover plate further comprises a mounting hole (10), a second end of the connecting plate (112) is provided with an avoidance groove (113), the mounting hole (10) comprises a first mounting hole (101), the bottom of the groove (7) is a base plate (5), the first mounting hole (101) is provided on the base plate (5), the pole (111) is inserted into the first mounting hole (101), and the avoidance groove (113) can accommodate the first protruding portion (81).

5. The battery cover according to claim 4, characterized in that: The pole (111) comprises a top plate (1111) and a side plate (1112); one end of the side plate (1112) is connected to the connection plate (112), and the other end is connected to the top plate (1111); the end of the pole (111) connected to the connection plate (112) is provided with a pole hole (1113); the open end of the pole (111) is provided with a deformation portion (1114); and the top plate (1111) is provided with a first thermistor (1111) on one side facing the deformation portion (1114). 5), a second thermistor (1116) is arranged on the side of the deformation portion (1114) facing the top plate (1111), and in a default state, the deformation portion (1114) can allow a movable gap to exist between the second thermistor (1116) and the first thermistor (1115), and in a protection state, the deformation portion (1114) can deform toward the top plate (1111) so that the second thermistor (1116) is pressed against the first thermistor (1115).

6. The battery cover according to claim 4, characterized in that: The mounting hole (10) comprises a positive electrode mounting hole (102) and a negative electrode mounting hole (103), the positive electrode mounting hole (102) and the negative electrode mounting hole (103) are respectively arranged on both sides of the exhaust portion (8), the connection unit (11) comprises a positive electrode connection unit and a negative electrode connection unit, the positive electrode connection unit is arranged in the positive electrode mounting hole (102), and the negative electrode connection unit is arranged in the negative electrode mounting hole (103); and / or, a sealing ring (12) is sleeved on the pole (111), and the sealing ring (12) is between the connection plate (112) and the bottom plate (5).

7. The battery cover according to claim 4, characterized in that: The battery cover plate further comprises a substrate (2), the substrate (2) being arranged on a side of the bottom plate (5) away from the groove (7), the substrate (2) being provided with a second mounting hole (21), the second mounting hole (21) being arranged at a position corresponding to the first mounting hole (101), the second mounting hole (21) being of the same size as the first mounting hole (101), the pole (111) being inserted into the first mounting hole (101) and the second mounting hole (21); and / or the substrate (2) being further provided with an explosion-proof valve (22), the explosion-proof valve (22) being arranged corresponding to the exhaust portion (8), the bottom plate (5) being provided with a connecting airway (13), one end of the connecting airway (13) being connected to the exhaust portion (8), and the other end facing the explosion-proof valve (22).

8. The battery cover according to claim 7, characterized in that: A heat-conducting layer (3) is arranged between the stop frame (1) and the base plate (2); a third mounting hole (31) and an explosion-proof hole (32) are arranged on the heat-conducting layer (3); the third mounting hole (31) is arranged at a position corresponding to the first mounting hole (101); the third mounting hole (31) is of the same size as the first mounting hole (101); an explosion-proof valve (22) is also arranged on the base plate (2); the explosion-proof hole (32) is arranged corresponding to the explosion-proof valve (22); and the pole (111) is inserted into the first mounting hole (101), the second mounting hole (21) and the third mounting hole (31).

9. A battery, characterized in that: It comprises a battery cover plate, wherein the battery cover plate is the battery cover plate according to any one of claims 1 to 8.

10. A battery pack, characterized in that: A battery is included, wherein the battery is the battery according to claim 9.

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