Lower plastic, end cover assembly, energy storage device and electric equipment

Abstract

According to the lower plastic, the end cover assembly, the energy storage device and the electric equipment provided by the invention, the lower plastic can be prevented from being deformed when being impacted by the electrolyte flowing at a high speed, so that the use reliability of the energy storage device can be improved. The lower plastic cement comprises first lower plastic cement and second lower plastic cement, and the first lower plastic cement and the second lower plastic cement are sequentially arranged in the length direction of the lower plastic cement; the first lower plastic comprises a first main body part, a first boss and a second boss, the first main body part is provided with a liquid inlet hole, the liquid inlet hole penetrates through the first main body part, and the first boss and the second boss are fixedly connected to the first face of the first main body part, protrude relative to the first face and are used for abutting against a battery cell of the energy storage device. The first boss is located on the side, facing the second lower plastic, of the liquid inlet hole and spaced from the liquid inlet hole, and the second boss is located on the side, away from the first boss, of the liquid inlet hole and spaced from the liquid inlet hole.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a lower plastic, an end cap assembly, an energy storage device, and an electrical device. Background Technology

[0002] Secondary batteries and other energy storage devices are widely used as the main power source for electrical equipment due to their recyclability. As the demand for energy storage devices gradually increases, the performance requirements for them are also rising. During the electrolyte injection process, the plastic casing of the energy storage device is easily deformed by the impact of the high-speed flowing electrolyte, reducing the reliability of the device. Utility Model Content

[0003] This application provides a lower plastic component, an end cap assembly, an energy storage device, and an electrical device, which can prevent the lower plastic component from deforming when subjected to the impact of high-speed flowing electrolyte, thereby helping to improve the reliability of the energy storage device.

[0004] In a first aspect, this application provides a lower plastic core for use in an energy storage device. The lower plastic core includes a first lower plastic core and a second lower plastic core, arranged sequentially along the length of the lower plastic core. The first lower plastic core includes a first main body portion, a first boss, and a second boss. The first main body portion includes a first surface and a second surface, which are arranged opposite to each other along the thickness direction of the first main body portion. The first main body portion has a liquid inlet hole that penetrates both the first surface and the second surface. The first boss and the second boss are both fixedly connected to the first surface and protrude relative to it, and are both used to abut against the battery cell of the energy storage device. Along the length of the lower plastic core, the first boss is located on the side of the liquid inlet hole facing the second lower plastic core and is spaced apart from the liquid inlet hole. The second boss is located on the side of the liquid inlet hole away from the first boss and is spaced apart from the liquid inlet hole.

[0005] The first main body is further provided with a first mounting hole, which penetrates the first surface and the second surface and is used to install the first pole unit of the energy storage device. Along the length direction of the first lower plastic, the first mounting hole is located on the side of the second boss away from the liquid inlet hole and is spaced apart from the second boss.

[0006] The second lower plastic includes a second main body and a third protrusion. Along the length of the lower plastic, the second main body and the first main body are arranged in sequence. The second main body includes a third surface and a fourth surface. The third surface faces the same direction as the first surface, and the fourth surface is opposite to the third surface. The third protrusion is fixedly connected to the third surface and protrudes relative to the third surface, and is used to abut against the battery cell of the energy storage device.

[0007] The second main body is provided with a second mounting hole, which penetrates the third and fourth surfaces. The second mounting hole is used to install the second pole unit of the energy storage device. Along the length of the lower plastic, the third boss is located on the side of the second mounting hole facing the first main body and is spaced apart from the second mounting hole.

[0008] Wherein, the length l2 of the second lower plastic is less than the length l1 of the first lower plastic, and the end of the second lower plastic facing the first lower plastic has a protrusion, the protrusion is located on the side of the first surface away from the second surface, and supports the first main body.

[0009] The ratio of the length l1 of the first lower plastic to the length l2 of the second lower plastic is 1.5 ≤ l1 / l2 ≤ 2.

[0010] The first lower plastic portion further includes a protective cover, which is fixedly connected to the first surface and covers the liquid inlet. The protective cover includes a baffle and a connecting plate. Along the thickness direction of the first lower plastic portion, the baffle is spaced apart from the first main body portion. The connecting plate is fixedly connected between the first main body portion and the baffle. The connecting plate has two liquid outlet holes, both of which penetrate the connecting plate along its thickness direction. Along the width direction of the lower plastic portion, the two liquid outlet holes are spaced apart and arranged opposite to each other.

[0011] The first main body is also provided with an explosion-proof fence, which penetrates the first surface and the second surface, and is located on the side of the liquid inlet hole away from the second boss, and is spaced apart from the liquid inlet hole, and is fixedly connected to the first boss.

[0012] Secondly, this application also provides an end cap assembly, including a cover plate and a lower plastic as described in any of the preceding claims, the cover plate being mounted on the second surface, the cover plate having an injection hole that penetrates the cover plate along its thickness direction and communicates with the inlet hole.

[0013] Thirdly, this application also provides an energy storage device, including a housing, a battery cell, and an end cap assembly as described above. The housing has an opening and a receiving cavity, the opening communicating with the receiving cavity, the battery cell being received in the receiving cavity, and the end cap assembly being mounted on the housing and closing the opening, wherein the first boss and the second boss abut against the battery cell.

[0014] Fourthly, this application also provides an electrical device, including the energy storage device described above, wherein the energy storage device supplies power to the electrical device.

[0015] In the technical solution provided in this application, the lower plastic is divided into a first lower plastic and a second lower plastic. A first boss and a second boss are provided on opposite sides of the injection hole of the first lower plastic. When the energy storage device injects electrolyte, the first and second bosses of the first lower plastic abut against the battery cell under the impact force of the high-speed flowing electrolyte. At this time, the battery cell can, in turn, provide support to the first lower plastic, thereby effectively improving the deformation problem of the first lower plastic caused by the high-speed impact of the electrolyte, preventing the lower plastic from deforming and cracking under the impact of the high-speed flowing electrolyte, and thus helping to improve the reliability of the energy storage device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0017] Figure 1 This is a schematic diagram of the energy storage device provided in the embodiments of this application;

[0018] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of the energy storage device shown after it is cut along point AA.

[0019] Figure 3 yes Figure 1 The diagram shows the structure of the end cap assembly in the energy storage device.

[0020] Figure 4 yes Figure 3 The exploded view of the end cap assembly is shown.

[0021] Figure 5 yes Figure 4 The diagram shows the structure of the lower plastic part in the end cap assembly.

[0022] Figure 6 yes Figure 5 The diagram below shows the structure of the plastic at another angle.

[0023] Figure 7 yes Figure 5 The diagram shows the structure of the lower plastic section cut along point BB.

[0024] Figure 8 yes Figure 3 A schematic diagram of the cover plate in the end cap assembly shown;

[0025] Figure 9 yes Figure 2 The diagram shows the flow of gas inside the energy storage device during thermal runaway.

[0026] The names corresponding to the labels in the figure are:

[0027] Energy storage device 100, housing 110, end cap assembly 120, battery cell 130, receiving cavity 110a, lower plastic part 10, cover plate 20, explosion-proof valve 30, first pole unit 40, second pole unit 50, first pin 60, second pin 70, first lower plastic part 11, second lower plastic part 12, first main body 11a, first boss 13, second boss 14, protective cover 16, first surface 111, second surface 112, explosion-proof fence 101, liquid inlet 106, first mounting hole 1 07, First mounting groove 102, First vent 103, Third vent 131, First air guide channel 141, Baffle 161, Connecting plate 162, Liquid flow hole 163, Second main body 12a, Third boss 15, Third surface 121, Fourth surface 122, Second mounting hole 108, Second vent 105, Second mounting groove 104, Protrusion 12b, Second air guide channel 151, Liquid injection hole 201, Explosion-proof hole 202, First assembly hole 203, Second assembly hole 204. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0029] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the energy storage device 100 provided in the embodiments of this application. Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the energy storage device 100 after being cut along line AA. "Cut along line AA" means cutting along the plane containing line AA; similar interpretations follow. Furthermore, for ease of description, the length direction of the energy storage device 100 is defined as the X-axis, the width direction as the Y-axis, and the height direction as the Z-axis. The X-axis, Y-axis, and Z-axis are all perpendicular to each other.

[0030] In this embodiment, the energy storage device 100 includes a housing 110, an end cap assembly 120, and a battery cell 130. The housing 110 has an opening (not shown) and a receiving cavity 110a, the opening communicating with the receiving cavity 110a. The battery cell 130 is housed in the receiving cavity 110a. The receiving cavity 110a also houses an electrolyte, in which the battery cell 130 is immersed. The end cap assembly 120 is mounted on one side of the housing 110 in the height direction (Z-axis direction shown in the figure) of the energy storage device 100 and closes the opening. Exemplarily, the energy storage device 100 is a prismatic battery. The width direction of the energy storage device 100 is parallel to the X-axis direction, the length direction is parallel to the Y-axis direction, and the height direction is parallel to the Z-axis direction. In other embodiments, the energy storage device 100 may also be a cylindrical battery or other types of batteries.

[0031] Please refer to the following: Figure 2 , Figure 3 and Figure 4 , Figure 3 yes Figure 1 The diagram shows the structure of the end cap assembly 120 in the energy storage device 100. Figure 4 yes Figure 3 The exploded structural diagram of the end cap assembly 120 shown.

[0032] The end cap assembly 120 includes a lower plastic part 10, a cover plate 20, an explosion-proof valve 30, a first pole unit 40, a second pole unit 50, a first pin 60, and a second pin 70. The lower plastic part 10 is mounted on one side of the cover plate 20 in the thickness direction. The first pole unit 40 and the second pole unit 50 of the explosion-proof valve 30 are both mounted on the cover plate 20. Along the length of the energy storage device 100, the first pole unit 40 and the second pole unit 50 are located on opposite sides of the explosion-proof valve 30. The first pin 60 is electrically connected to the first pole unit 40. The second pin 70 is electrically connected to the second pole unit 50.

[0033] Please refer to the following: Figures 5 to 7 , Figure 5 yes Figure 4 The diagram shows the structure of the lower plastic 10 in the end cap assembly 120. Figure 6 yes Figure 5 The diagram below shows the structure of plastic 10 at another angle. Figure 7 yes Figure 5 The diagram shows the structure of the lower plastic 10 cut along BB.

[0034] In this embodiment, the lower plastic 10 includes a first lower plastic 11 and a second lower plastic 12. The first lower plastic 11 and the second lower plastic 12 are arranged sequentially along the length direction of the lower plastic 10 (the X-axis direction in the figure). For example, both the first lower plastic 11 and the second lower plastic 12 are formed by injection molding.

[0035] In this embodiment, the length l1 of the first lower plastic 11 is greater than the length l2 of the second lower plastic 12. That is, the lever arm of the first lower plastic 11 is greater than the lever arm of the second lower plastic 12. The ratio of the length l1 of the first lower plastic 11 to the length l2 of the second lower plastic 12 is 1.5 ≤ l1 / l2 ≤ 2. This configuration effectively improves the feasibility of prototyping the first lower plastic 11 during the production process, facilitating its injection molding.

[0036] In this embodiment, the first lower plastic part 11 includes a first main body 11a, a first boss 13, a second boss 14, and a protective cover 16. The first boss 13 and the second boss 14 are both fixedly connected to one side of the first main body 11a in the thickness direction. The first main body 11a includes a first surface 111 and a second surface 112. Along the thickness direction of the first main body 11a, the first surface 111 and the second surface 112 are arranged opposite to each other. The first main body 11a also includes an explosion-proof fence 101, which penetrates the first surface 111 and the second surface 112. The first main body 11a is also provided with a liquid inlet 106, a first mounting hole 107, a first mounting groove 102, and a first vent hole 103. The liquid inlet 106, the first mounting hole 107, and the first vent hole 103 all penetrate the first surface 111 and the second surface 112 and are spaced apart from each other. Specifically, along the length of the lower plastic 10, the liquid inlet 106 and the first mounting hole 107 are both located on the side of the explosion-proof fence 101 away from the second lower plastic 12, and are spaced apart from the explosion-proof fence 101. Among them, along the length of the lower plastic 10, the liquid inlet 106 is located between the explosion-proof fence 101 and the first mounting hole 107.

[0037] In this embodiment, there are multiple first vent holes 103. The multiple first vent holes 103 are arranged in an array and spaced apart from each other. Among them, along the length direction of the lower plastic 10, a portion of the multiple first vent holes 103 are located on the side of the explosion-proof fence 101 opposite to the liquid inlet hole 106, and another portion of the multiple first vent holes 103 are located between the explosion-proof fence 101 and the first mounting hole 107.

[0038] The opening of the first mounting groove 102 is located on the first surface 111 of the first lower plastic 11. Specifically, the first mounting groove 102 is recessed from the first surface 111 toward the second surface 112. In this embodiment, the first mounting groove 102 is arranged around the periphery of the first mounting hole 107 and is spaced apart from the first vent hole 103. The first mounting groove 102 is used to mount the first pin 60.

[0039] In this embodiment, the first boss 13, the second boss 14, the protective cover 16, and the first main body 11a are integrally formed. For example, the first boss 13, the second boss 14, the protective cover 16, and the first main body 11a can be integrally formed using injection molding. Specifically, the first boss 13, the second boss 14, and the protective cover 16 are all fixedly connected to the first surface 111 of the first main body 11a, and are spaced apart from each other, and are also spaced apart from the liquid inlet 106. The first boss 13 and the second boss 14 both protrude relative to the first surface 111. Along the length of the lower plastic 10, the first boss 13 and the second boss 14 are located on opposite sides of the liquid inlet 106. Along the height of the energy storage device 100, the first boss 13 and the second boss 14 are both positioned opposite the battery cell 130. The first boss 13 and the second boss 14 are both used to abut against the battery cell 130 of the energy storage device 100.

[0040] Specifically, the first protrusion 13 is located on the side of the liquid inlet 106 facing the second lower plastic 12 and is fixedly connected to the explosion-proof fence 101. With this configuration, when the energy storage device 100 experiences thermal runaway, the first protrusion 13 can abut against the upward-moving battery cell 130, ensuring unobstructed ventilation between the explosion-proof fence 101 and the battery cell 130, and guaranteeing good ventilation. The first protrusion 13 is provided with a third vent 131. The third vent 131 penetrates the first protrusion 13 along its thickness direction, and also penetrates the first surface 111 and the second surface 112 of the first main body 11a, and communicates with the explosion-proof fence 101. In this embodiment, there are multiple third vents 131. Multiple third vents 131 are spaced apart along the width direction of the lower plastic 10.

[0041] In this embodiment, along the length of the lower plastic 10, the second boss 14 is located on the side of the liquid inlet 106 away from the first boss 13. That is, the second boss 14 is located on the side of the liquid inlet 106 away from the explosion-proof fence 101. In other words, the explosion-proof fence 101 is located on the side of the liquid inlet 106 away from the second boss 14.

[0042] Specifically, along the length of the lower plastic 10, the second boss 14 is located between the first mounting hole 107 and the liquid inlet hole 106, and is spaced apart from both the first mounting hole 107 and the liquid inlet hole 106. In other words, along the length of the lower plastic 10, a plurality of first vent holes 103 are located on the side of the second boss 14 away from the first mounting hole 107, and are spaced apart from the second boss 14. This arrangement avoids the second boss 14 from obstructing the subsequent installation of the first pin 60, prevents interference between the second boss 14 and the first pin 60, and ensures that the end cap assembly 120 can be assembled smoothly. In addition, along the length of the lower plastic 10, the width of the second boss 14 is smaller than the width of the first boss 13.

[0043] In this embodiment, the second protrusion 14 is provided with a first air guide channel 141. The first air guide channel 141 extends through the second protrusion 14 along the length of the lower plastic 10. For example, there are multiple first air guide channels 141. Multiple first air guide channels 141 are spaced apart along the width of the lower plastic 10.

[0044] In this embodiment, the lower plastic 10 is divided into a first lower plastic 11 and a second lower plastic 12, and a first protrusion 13 and a second protrusion 14 are provided on the first lower plastic 11. When the energy storage device 100 is injected with electrolyte, under the impact force of the high-speed flowing electrolyte, the first protrusion 13 and the second protrusion 14 of the first lower plastic 11 abut against the battery cell 130. At this time, the battery cell 130 can, in turn, provide support for the first lower plastic 11, thereby effectively improving the deformation problem of the first lower plastic 11 caused by the high-speed impact of the electrolyte, and thus helping to improve the reliability of the energy storage device 100.

[0045] A protective cover 16 is provided over the liquid inlet 106 of the first main body 11a. In this embodiment, the protective cover 16 includes a baffle 161 and a connecting plate 162. Along the thickness direction of the first lower plastic 11, the baffle 161 is spaced apart from the first main body 11a. The connecting plate 162 is fixedly connected between the first main body 11a and the baffle 161. The connecting plate 162 is provided with two liquid outlet holes 163, both of which penetrate the connecting plate 162 along its thickness direction. Along the width direction of the lower plastic 10, the two liquid outlet holes 163 are spaced apart and opposite to each other.

[0046] During the electrolyte filling process of the energy storage device 100, the electrolyte enters the protective cover 16 through the inlet hole 106 of the first main body 11a, and then flows into the receiving cavity 110a through the outlet hole 163 of the protective cover 16. By setting the protective cover 16 at the position where the inlet hole 106 is provided on the first lower plastic 10, and setting two outlet holes 163 in the width direction (Y-axis direction in the figure) of the protective cover 16, when the electrolyte flows into the receiving cavity 110a from the outlet holes 163, the electrolyte only impacts the housing 110 of the energy storage device 100 from both sides in the width direction of the lower plastic 10. This can prevent the electrolyte from directly impacting the battery cell 130, which helps to reduce the impact of the electrolyte on the electrode of the battery cell 130, and thus helps to ensure the better reliability of the energy storage device 100.

[0047] Furthermore, in actual production, the energy storage device 100 is usually transported along its length. By setting a protective cover 16 and providing a liquid flow hole 163 in the width direction of the protective cover 16, the electrolyte in the receiving cavity 110a can be prevented from overflowing due to the shaking of the energy storage device 100 in the length direction during transportation. This can prevent the instability of the cell performance of the energy storage device 100 caused by the instantaneous reduction of electrolyte, and thus help ensure the good reliability of the energy storage device 100.

[0048] Please continue reading. Figures 2 to 4 The second lower plastic part 12 includes a second main body 12a and a third boss 15, the third boss 15 being fixedly connected to one side of the second main body 12a in the thickness direction. The second main body 12a and the first main body 11a are arranged sequentially along the length direction of the lower plastic part 10. The length l1 of the first main body 11a is greater than the length l2 of the second main body 12a, and the ratio of the length l1 of the first main body 11a to the length l2 of the second main body 12a is 1.5 ≤ l1 / l2 ≤ 2.

[0049] In this embodiment, the second main body 12a includes a third surface 121 and a fourth surface 122. Along the thickness direction of the second main body 12a, the third surface 121 and the fourth surface 122 are arranged opposite to each other. The third surface 121 and the first surface 111 of the first main body 11a have the same orientation, and together with the first surface 111, they form the bottom surface of the lower plastic 10. The fourth surface 122 and the second surface 112 of the first lower plastic 11 have the same orientation, and together with the second surface 112, they form the top surface of the lower plastic 10.

[0050] The second main body 12a is further provided with a second mounting hole 108, a second vent hole 105, and a second mounting groove 104. The second mounting hole 108 and the second vent hole 105 both penetrate the third surface 121 and the fourth surface 122, and are spaced apart from each other. Along the length of the lower plastic 10, the second vent hole 105 is located on the side of the second mounting hole 108 facing the first main body 11a of the first lower plastic 11, and is spaced apart from the second mounting hole 108. For example, there are multiple second vent holes 105. The multiple second vent holes 105 are arranged in an array and are spaced apart from each other. The opening of the second mounting groove 104 is located on the third surface 121 of the second lower plastic 12. Specifically, the second mounting groove 104 is recessed from the third surface 121 towards the fourth surface 122. In this embodiment, the second mounting groove 104 is arranged around the periphery of the second mounting hole 108 and is spaced apart from the second vent hole 105. The second mounting groove 104 is used to mount the second pin 70.

[0051] Furthermore, the second lower plastic 12 has a protrusion 12b at one end facing the first lower plastic 11. Specifically, the second main body 12a has a protrusion 12b at one end facing the first main body 11a. The protrusion 12b is located on the side of the first surface 111 of the first main body 11a that faces away from the second surface 112, and supports the first main body 11a of the first lower plastic 11.

[0052] It is understandable that by providing a protrusion 12b at one end of the second main body portion 12a of the second lower plastic 12 toward the first main body portion 11a of the first lower plastic 11, and placing the protrusion 12b on the side of the first surface 111 of the first main body portion 11a away from the second surface 112, since the length of the second lower plastic 12 is less than the length of the first lower plastic 11, the lever arm of the second lower plastic 12 is shorter and less prone to deformation. The protrusion 12b can provide support for the first lower plastic 11, making it less likely for the first lower plastic 11 to bend and deform toward the battery cell 130 of the energy storage device 100. This makes it easier to prevent the lower plastic 10 as a whole from deforming, which helps to ensure the overall reliability of the end cap assembly 120.

[0053] The third protrusion 15 is fixedly connected to the third surface 121 and protrudes relative to the third surface 121, serving to abut against the battery cell 130 of the energy storage device 100. Along the length of the lower plastic 10, the third protrusion 15 is located on the side of the second mounting hole 108 facing the first main body 11a, and is spaced apart from the second mounting hole 108. Specifically, the third protrusion 15 is located between the second mounting groove 104 and the second vent hole 105, and is spaced apart from both the second mounting groove 104 and the second vent hole 105. In other words, along the length of the lower plastic 10, the second vent hole 105 of the second lower plastic 12 is located on the side of the third protrusion 15 facing away from the second mounting hole 108, and is spaced apart from the third protrusion 15. This arrangement prevents the third protrusion 15 from obstructing the subsequent installation of the second pin 70, prevents interference between the third protrusion 15 and the second pin 70, and ensures that the end cap assembly 120 can be successfully assembled.

[0054] In this embodiment, the third protrusion 15 is provided with a second air guide channel 151. The second air guide channel 151 extends through the third protrusion 15 along the length of the lower plastic 10. For example, there are multiple second air guide channels 151. Multiple second air guide channels 151 are spaced apart along the width of the lower plastic 10.

[0055] Understandably, when thermal runaway occurs in the energy storage device 100, the battery cell 130 will move and arch towards the end cap assembly 120 under the influence of airflow. At this time, the first protrusion 13, the second protrusion 14, and the third protrusion 15 of the lower plastic 10 abut against the battery cell 130, which can limit the battery cell 130 and prevent it from shaking violently. This can prevent the battery cell 130 from becoming loose or its tabs from being torn, thereby helping to improve the safety performance of the battery cell 130 and ensuring the reliability and safety of the energy storage device 100.

[0056] Please refer to the following: Figure 2 and Figure 8 , Figure 8 yes Figure 3 A schematic diagram of the structure of the cover plate 20 in the end cap assembly 120 shown.

[0057] In this embodiment, the cover plate 20 is provided with an injection hole 201, an explosion-proof hole 202, a first assembly hole 203, and a second assembly hole 204. The explosion-proof hole 202, the injection hole 201, the first assembly hole 203, and the second assembly hole 204 all penetrate the cover plate 20 along its thickness direction and are spaced apart from each other. Specifically, along the length direction of the cover plate 20, the explosion-proof hole 202 is located in the middle of the cover plate 20 and communicates with the explosion-proof fence 101 of the first lower plastic 11. The explosion-proof hole 202 can communicate with the interior of the energy storage device 100 through the explosion-proof fence 101.

[0058] Along the length of the cover plate 20, the first mounting hole 203 and the second mounting hole 204 are located on opposite sides of the explosion-proof hole 202. The first mounting hole 203 communicates with the first mounting hole 107 of the first lower plastic 11 to facilitate the installation of the first pole post unit 40. The second mounting hole 204 communicates with the second mounting hole 108 of the second lower plastic 12 to facilitate the installation of the second pole post unit 50.

[0059] Along the length of the cover plate 20 (X-axis direction in the figure), the injection hole 201 is located between the explosion-proof hole 202 and the first assembly hole 203. The injection hole 201 is connected to the liquid inlet hole 106 of the first lower plastic 11. Electrolyte can be injected into the receiving cavity 110a of the housing 110 (e.g., along the length of the cover plate 20) and the liquid inlet hole 106 of the first lower plastic 11. Figure 2 (As shown) to achieve the filling of electrolyte into the energy storage device 100.

[0060] Please refer to it again. Figure 3The explosion-proof valve 30 is installed in the explosion-proof hole 202 and fixedly connected to the hole wall of the explosion-proof hole 202. For example, the explosion-proof valve 30 can be fixedly connected to the hole wall of the explosion-proof hole 202 by welding. It is understood that since the explosion-proof hole 202 connects the interior and exterior of the energy storage device 100, when the internal gas pressure of the energy storage device 100 is too high, the explosion-proof valve 30 will rupture under the pressure. The gas inside the energy storage device 100 can then be discharged to the exterior of the energy storage device 100 in a timely manner through the third vent hole 131 of the first protrusion 13, the explosion-proof fence 101, and the explosion-proof hole 202 of the cover plate 20, preventing the energy storage device 100 from exploding and improving the reliability of the energy storage device 100.

[0061] Please refer to it again. Figure 2 In this embodiment, the first terminal unit 40 passes through the first mounting hole 107 of the first lower plastic 11 and the first assembly hole 203 of the cover plate 20. Exemplarily, the first terminal unit 40 is a positive terminal unit and is electrically connected to the positive electrode tab of the battery cell 130. The second terminal unit 50 passes through the second mounting hole 108 of the second lower plastic 12 and the second assembly hole 204 of the cover plate 20. Exemplarily, the second terminal unit 50 is a negative terminal unit and is electrically connected to the negative electrode tab of the battery cell 130.

[0062] The first pin 60 is mounted in the first mounting groove 102 of the first lower plastic 11 and electrically connected to the first terminal unit 40. Specifically, one end of the first pin 60 is electrically connected to the first terminal unit 40, and the other end is electrically connected to the positive electrode tab of the battery cell 130. For example, the first pin 60 can be electrically connected to the first terminal unit 40 and / or the positive electrode tab of the battery cell 130 by soldering. The second pin 70 is mounted in the second mounting groove 104 of the second lower plastic 12 and electrically connected to the second terminal unit 50. Specifically, one end of the second pin 70 is electrically connected to the second terminal unit 50, and the other end is electrically connected to the negative electrode tab of the battery cell 130. For example, the second pin 70 can be electrically connected to the second terminal unit 50 and / or the negative electrode tab of the battery cell 130 by soldering.

[0063] Please refer to the following: Figure 2 and Figure 9 , Figure 9 yes Figure 2 A schematic diagram showing the flow of internal gas when thermal runaway occurs in the energy storage device 100.

[0064] In this embodiment, when thermal runaway occurs in the energy storage device 100, the gas inside the energy storage device 100 reaches the top of the battery cell 130 through the gap between the first pin 60 and the battery cell 130 and the gap between the second pin 70 and the battery cell 130. It then passes through the first venting channel 141 of the second protrusion 14, the explosion-proof fence 101, and the second venting channel 151 of the third protrusion 15, and reaches the bottom of the explosion-proof valve 30 through the explosion-proof hole 202 of the cover plate 20. Simultaneously, the cover plate 20 arches under the action of the thermal runaway gas, creating a gap between the cover plate 20 and the lower plastic 10. At this time, the gas from the energy storage device 100 reaching the top of the battery cell 130 can also reach the bottom of the explosion-proof valve 30 through multiple arrayed first vent holes 103, multiple arrayed second vent holes 105, and multiple third vent holes 131.

[0065] With this configuration, a three-dimensional air passage can be formed in the lower plastic 10 to guide the thermal runaway gas inside the energy storage device 100 to flow rapidly to the area below the explosion-proof valve 30. This helps to improve the exhaust efficiency of the thermal runaway gas, allowing it to quickly reach the area below the explosion-proof valve 30. This ensures that the valve can be opened in time to release pressure when the energy storage device 100 experiences thermal runaway, preventing the energy storage device 100 from exploding. This, in turn, helps to reduce the risk of the energy storage device 100 exploding and improves its safety performance.

[0066] This application also provides an electrical device, which includes the aforementioned energy storage device 100, and the energy storage device 100 supplies power to the electrical device. The electrical device can be a new energy vehicle, a power storage station, a server, or other equipment that requires electricity.

[0067] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A type of plastic for use in energy storage devices, characterized in that, The lower plastic includes a first lower plastic and a second lower plastic, which are arranged sequentially along the length of the lower plastic. The first lower plastic part includes a first main body, a first boss and a second boss. The first main body includes a first surface and a second surface, and the first surface and the second surface are disposed opposite to each other along the thickness direction of the first main body. The first main body is provided with a liquid inlet hole, which penetrates the first surface and the second surface. The first boss and the second boss are both fixedly connected to the first surface and protrude relative to the first surface, and are both used to abut against the battery cell of the energy storage device. Along the length direction of the lower plastic, the first boss is located on the side of the liquid inlet hole facing the second lower plastic and is spaced apart from the liquid inlet hole. The second boss is located on the side of the liquid inlet hole away from the first boss and is spaced apart from the liquid inlet hole.

2. The lower plastic according to claim 1, characterized in that, The first main body is also provided with a first mounting hole, which penetrates the first surface and the second surface and is used to install the first pole unit of the energy storage device. Along the length direction of the first lower plastic, the first mounting hole is located on the side of the second boss away from the liquid inlet and is spaced apart from the second boss.

3. The lower plastic according to claim 1 or 2, characterized in that, The second lower plastic includes a second main body and a third protrusion. Along the length of the lower plastic, the second main body and the first main body are arranged in sequence. The second main body includes a third surface and a fourth surface. The third surface faces the same direction as the first surface, and the fourth surface is opposite to the third surface. The third protrusion is fixedly connected to the third surface and protrudes relative to the third surface, and is used to abut against the battery cell of the energy storage device.

4. The lower plastic according to claim 3, characterized in that, The second main body is provided with a second mounting hole, which penetrates the third surface and the fourth surface. The second mounting hole is used to install the second pole unit of the energy storage device. Along the length of the lower plastic, the third boss is located on the side of the second mounting hole facing the first main body and is spaced apart from the second mounting hole.

5. The lower plastic according to claim 1 or 2, characterized in that, The length l2 of the second lower plastic is less than the length l1 of the first lower plastic. The end of the second lower plastic facing the first lower plastic has a protrusion. The protrusion is located on the side of the first surface away from the second surface and supports the first main body.

6. The lower plastic according to claim 5, characterized in that, The ratio of the length l1 of the first lower plastic to the length l2 of the second lower plastic is 1.5 ≤ l1 / l2 ≤ 2.

7. The lower plastic according to claim 1, characterized in that, The first lower plastic also includes a protective cover, which is fixedly connected to the first surface and covers the liquid inlet. The protective cover includes a baffle and a connecting plate. Along the thickness direction of the first lower plastic, the baffle is spaced apart from the first main body. The connecting plate is fixedly connected between the first main body and the baffle. The connecting plate has two liquid outlet holes, both of which penetrate the connecting plate along the thickness direction. Along the width direction of the lower plastic, the two liquid outlet holes are spaced apart and arranged opposite to each other.

8. An end cap assembly, characterized in that, The device includes a cover plate and a lower plastic material as described in any one of claims 1 to 7, the cover plate being mounted on the second surface, the cover plate having an injection hole that penetrates the cover plate along its thickness direction and communicates with the inlet hole.

9. The end cap assembly according to claim 8, characterized in that, The first main body is also provided with an explosion-proof fence, which penetrates the first surface and the second surface, and is located on the side of the liquid inlet hole away from the second protrusion, and is spaced apart from the liquid inlet hole, and is fixedly connected to the first protrusion.

10. An energy storage device, characterized in that, The device includes a housing, a battery cell, and an end cap assembly as described in claim 8 or 9, wherein the housing has an opening and a receiving cavity, the opening communicating with the receiving cavity, the battery cell being received in the receiving cavity, and the end cap assembly being mounted on the housing and closing the opening, wherein the first boss and the second boss abut against the battery cell.

11. An electrical appliance, characterized in that, It includes the energy storage device as described in claim 10, wherein the energy storage device supplies power to the electrical equipment.

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