Power storage device and power consuming device

Abstract

This application provides an energy storage device and an electrical device. The energy storage device includes a housing, a cover, a battery pack, an insulating plate, an electrode assembly, and a control circuit board. The cover and the housing together form a receiving cavity, and the surface of the housing has a through hole communicating with the receiving cavity. The battery pack includes multiple cells stacked along its width and is disposed within the receiving cavity. The insulating plate is disposed on the outer surface of the cover, covering the through hole and being sealed to the cover by a sealing element. The electrode assembly is disposed through the insulating plate, and has an outer connection end and an inner connection end. The inner connection end extends into the receiving cavity through the through hole, and the outer connection end protrudes from the outer surface of the insulating plate. The control circuit board is disposed within the receiving cavity and is electrically connected to the inner connection end of the electrode assembly. The control circuit board is thermally coupled to the cover. The thermal conductivity of the cover is greater than that of the insulating plate.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to an energy storage device and an electrical appliance. Background Technology

[0002] Battery packs and other energy storage devices can store electrical energy and discharge it. During power supply and charging, heat is inevitably generated in various parts of the device, such as circuit boards and terminals. Excessive heat accumulation inside the device can easily lead to the melting of parts of the structure, or even fire and explosion, affecting the device's operational safety. Therefore, the heat dissipation performance of energy storage devices is crucial. Furthermore, many parts of energy storage devices have seals; when the temperature of these seals is too high, they can melt, causing seal failure and affecting the device's sealing performance. Utility Model Content

[0003] In view of this, the embodiments of this application aim to provide an energy storage device and an electrical device to solve the problem that the temperature of existing energy storage devices is too high, heat is transferred to the sealing element, the sealing element melts due to heat, resulting in sealing failure and affecting the sealing performance of the energy storage device.

[0004] The first aspect of this application provides an energy storage device, comprising: Box; The cover, together with the box body, forms a receiving cavity, and the surface of the cover body is provided with a through hole communicating with the receiving cavity; A battery pack, comprising a plurality of cells stacked along the width direction, is disposed within the receiving cavity; An insulating plate is disposed on the outer surface of the cover, the insulating plate covers the through hole and is sealed to the cover by a sealing element; A pole assembly is disposed through the insulating plate. The pole assembly has an outer connection end and an inner connection end. The inner connection end extends into the receiving cavity through the through hole, and the outer connection end protrudes from the outer surface of the insulating plate. A control circuit board is disposed within the receiving cavity. The control circuit board is electrically connected to the inner connection terminal of the pole assembly and thermally coupled to the cover. The thermal conductivity of the cover is greater than that of the insulating plate.

[0005] In one embodiment of this application, an exhaust port is provided on the top surface of the cover on the side away from the insulating plate along the height direction; And / or, the insulating plate is located on the first side of the cover, and a heat dissipation part is provided on the second side of the cover away from the first side, the heat dissipation part including at least two heat dissipation fins spaced apart along the length direction; Preferably, the area S(1) of the heat dissipation fins satisfies 180 mm². 2 ≤S(1)≤5000mm 2 ; Preferably, the spacing d between adjacent heat dissipation fins satisfies 3mm≤d≤20mm; Preferably, the number of heat dissipation fins ranges from 2 to 10.

[0006] In one embodiment of this application, the terminal assembly includes a first terminal, a second terminal, and a third terminal; the first terminal and the second terminal are both electrically connected to the positive terminal of the battery pack via the control circuit board; the third terminal is electrically connected to the negative terminal of the battery pack via the control circuit board. Preferably, along the length direction, the first pole, the second pole and the third pole are arranged sequentially on the first side of the insulating plate, and the distance L(1) between the first pole and the second pole is less than the distance L(2) between the second pole and the third pole. Preferably, the distance L(1) between the first pole and the second pole satisfies 20mm≤L(1)≤100mm; Preferably, the distance L(2) between the second pole and the third pole satisfies 45mm≤L(2)≤200mm.

[0007] In one embodiment of this application, the control circuit board includes a first circuit board and a second circuit board; along the height direction, the first circuit board is disposed on the side of the second circuit board closer to the battery pack; Switching components are arranged on both the first circuit board and the second circuit board. The number of switching components on the first circuit board is less than the number of switching components on the second circuit board, or the continuous current carrying capacity of the switching components on the first circuit board is less than the continuous current carrying capacity of the switching components on the second circuit board. The first circuit board is provided with a positive electrode connection part, a negative electrode connection part, a first inner connection part and a third outer connection part; the positive terminal of the battery pack is fixedly connected to the positive electrode connection part of the first circuit board; the positive terminal of the battery pack is fixedly connected to the positive electrode connection part of the first circuit board, and the third outer connection part is electrically connected to the third terminal post. The second circuit board is provided with a second inner connection part, a first outer connection part and a second outer connection part. An electrical connector is fixedly provided between the first inner connection part and the second inner connection part. The first pole is electrically connected to the first outer connection part of the second circuit board, and the second pole is electrically connected to the second outer connection part of the second circuit board.

[0008] In one embodiment of this application, a heat-conducting portion is provided between the second circuit board and the inner wall surface of the cover, and the heat-conducting portion is disposed opposite to the heat dissipation portion; Preferably, the thermally conductive part is a thermally conductive adhesive; Preferably, the thermal conductivity of the heat-conducting part is T, and the range of T is 1.0 W / (m·K) ≤ T.

[0009] In one embodiment of this application, the length of the electrical connector is greater than the distance between the first circuit board and the second circuit board; Preferably, in the orthographic projection along the width direction, the electrical connector is Z-shaped; Preferably, the overall length of the electrical connector is N(1), the distance between the first circuit board and the second circuit board is N(2), and N(1) / N(2) satisfies 1≤N(1) / N(2)≤8; Preferably, the distance N(2) between the first circuit board and the second circuit board satisfies 10mm≤N(2)≤40mm, and the overall length N(1) of the electrical connector satisfies 30mm≤N(1)≤150mm; Preferably, the overall width N(3) of the electrical connector satisfies 10mm≤N(3)≤60mm.

[0010] In one embodiment of this application, the projection of the second circuit board onto the first circuit board does not overlap with either the positive electrode connection portion or the negative electrode connection portion; Preferably, the minimum distance g between the projection of the second circuit board onto the first circuit board and the positive and negative connection portions is ≥3mm.

[0011] In one embodiment of this application, the insulating plate has a plurality of first grooves on the side facing the cover; and / or, the cover has a plurality of second grooves on the side facing the insulating plate; Preferably, the depth H(1) of the first groove satisfies 1mm≤H(1)≤10mm; Preferably, the depth H(2) of the second groove satisfies 0.5mm≤H(2)≤5mm.

[0012] In one embodiment of this application, the thermal conductivity of the cover is A, and the range of A is 50 W / (m·K) ≤ A ≤ 550 W / (m·K); And / or, the thermal conductivity of the insulating plate is B, and the range of B is 0.1 W / (m·K) ≤ B ≤ 0.5 W / (m·K); Preferably, the cover is constructed to be made of at least one material selected from iron, aluminum, copper, iron alloy, aluminum alloy, and copper alloy, and / or the insulating plate is constructed to be made of at least one material selected from rubber, glass fiber, nylon, ABS, PC, PP, PET, and PPE. Preferably, the seal is disposed at the edge of the insulating plate.

[0013] Another aspect of this application provides an electrical device including the aforementioned energy storage device.

[0014] In the energy storage device of this application embodiment, the control circuit board is thermally coupled to the cover, and the thermal conductivity of the cover is greater than that of the insulating plate. In this way, the heat generated on the control circuit board can be dissipated to the outside through the cover, avoiding the accumulation of a large amount of heat inside the energy storage device. Since the thermal conductivity of the insulating plate is smaller than that of the cover, and the insulating plate is sealed to the cover through a sealing element, the heat generated by the pole assembly is difficult to be transferred to the sealing element through the insulating plate. This can effectively ensure the sealing performance of the sealing element, avoid heat damage to the sealing element, extend the service life of the sealing element, and improve the working stability of the energy storage device. Attached Figure Description

[0015] It should be understood that the following figures only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0016] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0017] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0018] Figure 1 This is a perspective view of an energy storage device according to an embodiment of this application.

[0019] Figure 2 This is a partial perspective view of the energy storage device according to an embodiment of this application.

[0020] Figure 3 This is a partial perspective view of the energy storage device according to an embodiment of this application.

[0021] Figure 4 This is a partial perspective view of the energy storage device according to an embodiment of this application.

[0022] Figure 5 This is a cross-sectional schematic diagram of an energy storage device according to an embodiment of this application.

[0023] Figure 6 This is a partial perspective view of the energy storage device according to an embodiment of this application.

[0024] Figure 7This is a partial perspective view of the energy storage device according to an embodiment of this application.

[0025] Figure 8 This is a partial perspective view of the energy storage device according to an embodiment of this application.

[0026] Figure 9 This is a partial cross-sectional schematic diagram of the energy storage device according to an embodiment of this application.

[0027] Figure 10 This is a partial perspective view of the energy storage device according to an embodiment of this application.

[0028] Figure 11 This is a partial perspective view of the energy storage device according to an embodiment of this application.

[0029] Attached image labels: 11. Housing; 12. Cover; 121. Exhaust port; 122. Heat dissipation part; 1221. Heat dissipation fins; 124. Through hole; 125. Second groove; 20. Battery pack; 21. Battery cell; 31. Insulating plate; 311. First groove; 312. Inner extension; 32. Sealing element; 40. Terminal assembly; 41. First terminal; 42. Second terminal; 43. Third terminal; 44. External connection end; 45. Internal connection end; 50. Control circuit board; 51. First circuit board; 511. Positive terminal connection part; 512. Negative terminal connection part; 513. First internal connection part; 514. Third external connection part; 52. Second circuit board; 521. Second internal connection part; 522. First external connection part; 523. Second external connection part; 61. Electrical connector; 62. Conductive component; 63. Heat-conducting part; 64. Tab bracket. Detailed Implementation

[0030] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] like Figures 1 to 11As shown, this application embodiment provides an energy storage device that can store electrical energy and discharge it to the outside. Specifically, the energy storage device of this application embodiment includes at least a housing 11, a cover 12, a battery pack 20, an insulating plate 31, an electrode assembly 40, and a control circuit board 50.

[0033] The housing 11 and the cover 12 together form a receiving cavity, which is used to accommodate components required by the energy storage device of this embodiment, such as the battery pack 20 and the control circuit board 50. Figure 3 As shown, the surface of the cover 12 is provided with a through hole 124 that connects to the receiving cavity.

[0034] like Figure 2 As shown, the battery pack 20 includes a plurality of battery cells 21 stacked along its width direction, and the battery pack 20 is disposed within a receiving cavity. It can be understood that, as Figure 2 As shown, the battery cell 21 has a width direction X, a length direction Y, and a height direction Z. The width (thickness) direction of the battery cell 21 is the width direction of the energy storage device, and the length direction of the battery cell 21 is the length direction of the energy storage device.

[0035] like Figure 4 and Figure 5 As shown, an insulating plate 31 is disposed on the outer surface of the cover 12, and the insulating plate 31 covers the through hole 124 provided on the surface of the cover 12 and is sealed to the cover 12 through a sealing member 32. Since the insulating plate 31 covers the through hole 124 provided on the surface of the cover 12 and is sealed to the cover 12 through the sealing member 32, the gap between the insulating plate 31 and the cover 12 can be sealed by the sealing member 32, preventing the receiving cavity from communicating with the outside through the gap between the insulating plate 31 and the cover 12.

[0036] Furthermore, such as Figure 4 As shown, the insulating plate 31 can be fixed to the outer surface of the cover 12 using bolts or other fasteners to ensure a fixed connection between the two and improve the sealing effect of the sealing element 32 in sealing the gap between the insulating plate 31 and the cover 12.

[0037] like Figure 5 As shown, the electrode assembly 40 is disposed through the insulating plate 31. The electrode assembly 40 has an outer connection end 44 and an inner connection end 45. The inner connection end 45 extends into the receiving cavity through the through hole 124, and the outer connection end 44 protrudes from the outer surface of the insulating plate 31. It can be understood that in order to form a conductive circuit, the electrode assembly 40 includes at least two electrode units with opposite polarities.

[0038] To prevent short circuits between the terminals of the terminal assembly 40, the terminal assembly 40 is disposed through the insulating plate 31. The insulating plate 31 can be made of insulating materials such as plastic or rubber to ensure insulation performance. Furthermore, the terminal assembly 40 needs to be insulated from the housing. Therefore, although the inner connection end 45 of the terminal assembly 40 extends into the receiving cavity through the through hole 124 provided on the surface of the cover 12, the terminal assembly 40 and the cover 12 do not directly contact each other and are not electrically connected.

[0039] Specifically, such as Figure 5 As shown, the insulating plate 31 is provided with an inner extension 312 corresponding to the through hole 124 of the cover 12. The pole post assembly 40 is disposed through the inner extension 312. The inner extension 312 can separate the pole post assembly 40 from the cover 12, and a gap is also provided between the inner extension 312 and the inner wall of the through hole 124.

[0040] like Figure 7 As shown, the control circuit board 50 is disposed within the receiving cavity, and is electrically connected to the inner connection terminal 45 of the terminal assembly 40. Furthermore, the battery pack 20 is also electrically connected to the control circuit board 50. Specifically, it can be understood that, as... Figure 7 As shown, the individual terminals of the terminal assembly 40 can be electrically connected to the control circuit board 50 via the conductive element 62. The energy storage device of this embodiment may also include a tab bracket 64, and the tabs of each cell 21 of the battery pack 20 can be fixed on the tab bracket 64 so that the tabs of each cell 21 can be electrically connected to each other or to the control circuit board 50. No further limitations are made here.

[0041] Therefore, in the working state of the energy storage device in this application embodiment, the connection cable of the external device will be connected to the external connection terminal 44 of the terminal assembly 40, which can form a conductive circuit of external device - one terminal cell of terminal assembly 40 - battery pack 20 - another terminal cell of terminal assembly 40 - external device, so that the energy storage device of this application embodiment can discharge to the outside or the external device can charge the energy storage device of this application embodiment.

[0042] During the long-term operation of the energy storage device in this embodiment, a large amount of heat will be generated on each terminal of the terminal assembly 40 and the control circuit board 50. In particular, when the current flowing through some terminal is too large, a lot of heat will be generated on the terminal and the control circuit board 50 in a short period of time. Since the control circuit board 50 is located in the cavity, the heat generated by the control circuit board 50 is easy to accumulate inside the energy storage device, which may lead to the melting of part of the energy storage device structure, or even fire and explosion of the energy storage device, affecting the working safety of the energy storage device.

[0043] Therefore, in the energy storage device of this application embodiment, the control circuit board 50 is thermally coupled to the cover 12, and the thermal conductivity of the cover 12 is greater than that of the insulating plate 31. In this way, the heat generated on the control circuit board 50 can be dissipated to the outside through the cover 12, avoiding the accumulation of a large amount of heat inside the energy storage device. Since the thermal conductivity of the insulating plate 31 is smaller than that of the cover 12, and the insulating plate 31 is sealed to the cover 12 through the sealing member 32, the heat generated by the pole assembly 40 is difficult to be transferred to the sealing member 32 through the insulating plate 31. This can effectively ensure the sealing performance of the sealing member 32, avoid the sealing member 32 from being damaged by heat, extend the service life of the sealing member 32, and improve the working stability of the energy storage device.

[0044] In one embodiment of this application, the thermal conductivity of the cover 12 is A, and the range of A is 50 W / (m·K) ≤ A ≤ 550 W / (m·K). When the thermal conductivity A of the cover 12 is within the range of 50 W / (m·K) ≤ A ≤ 550 W / (m·K), the heat dissipation performance of the cover 12 can be effectively guaranteed. This ensures that the heat generated on the control circuit board 50 can be dissipated outward through the cover 12, preventing the accumulation of a large amount of heat inside the energy storage device and preventing the partial structure of the energy storage device from melting due to heat, thus effectively improving the operational safety of the energy storage device. In specific embodiments, the thermal conductivity A of the cover 12 can be specific values ​​such as 50 W / (m·K), 96 W / (m·K), 160 W / (m·K), 300 W / (m·K), and 550 W / (m·K), which are not limited here.

[0045] Furthermore, in one embodiment of this application, the cover 12 is constructed from at least one material selected from iron, aluminum, copper, iron alloys, aluminum alloys, and copper alloys. When the cover 12 is made from at least one material selected from iron, aluminum, copper, iron alloys, aluminum alloys, and copper alloys, it not only effectively ensures that the thermal conductivity A of the cover 12 satisfies the condition 50 W / (m·K) ≤ A ≤ 550 W / (m·K), thereby ensuring the heat dissipation performance of the cover 12, but also effectively improves the temperature tolerance of the cover 12, thus ensuring the structural stability of the cover 12. The cover 12 can be manufactured using processes such as integral casting, and no limitation is made herein.

[0046] In one embodiment of this application, the thermal conductivity of the insulating plate 31 is B, and the range of B is 0.1 W / (m·K) ≤ B ≤ 0.5 W / (m·K). When the thermal conductivity B of the insulating plate 31 is in the range of 0.1 W / (m·K) ≤ B ≤ 0.5 W / (m·K), it can prevent the heat generated by the pole assembly 40 from being transferred to the sealing element 32 at the edge of the insulating plate 31 through the insulating plate 31, thereby effectively ensuring the sealing performance of the sealing element 32, avoiding heat damage to the sealing element 32, and extending the service life of the sealing element 32. In specific embodiments, the thermal conductivity B of the insulating plate 31 can be specific values ​​such as 0.1 W / (m·K), 0.16 W / (m·K), 0.25 W / (m·K), 0.4 W / (m·K), and 0.5 W / (m·K), which are not limited here.

[0047] Furthermore, in one embodiment of this application, the insulating plate 31 is constructed from at least one material selected from rubber, glass fiber, nylon, ABS (acrylonitrile-butadiene-styrene copolymer), PC (polycarbonate), PP (polypropylene), PET (polyethylene terephthalate), and PPE (polyphenylene oxide). When the insulating plate 31 is made from at least one material selected from CC and DD, not only can the thermal conductivity B of the insulating plate 31 satisfy the condition of 0.1 W / (m·K) ≤ B ≤ 0.5 W / (m·K), but the insulation performance of the insulating plate 31 can also be effectively guaranteed, thereby preventing short circuits between the individual terminals on the insulating plate 31. The insulating plate 31 can be manufactured using processes such as integral injection molding, and no limitation is made herein.

[0048] like Figure 5 As shown, in one embodiment of this application, the sealing element 32 is disposed on the edge of the insulating plate 31. Since the sealing element 32 is disposed on the edge of the insulating plate 31, it can not only seal the gap between the edge of the insulating plate 31 and the cover 12, preventing the cavity from communicating with the outside through the gap, but also effectively extend the distance between the sealing element 32 and the pole assembly 40, further preventing the heat generated by the pole assembly 40 from being transferred to the sealing element 32 at the edge of the insulating plate 31 through the insulating plate 31.

[0049] like Figure 4 As shown in one embodiment of this application, an exhaust port 121 is provided on the top surface of the cover 12 on the side away from the insulating plate 31 along the height direction. The exhaust port 121 can connect the outside and the receiving cavity, thereby guiding the hot airflow generated in the receiving cavity of the energy storage device to flow away from the insulating plate 31, further reducing the impact of heat in the energy storage device on the insulating plate 31. Specifically, a barrier pad or other structure can be provided in the exhaust port 121 to ensure airflow while preventing other external parts from entering the receiving cavity through the exhaust port 121.

[0050] like Figure 6 As shown, in one embodiment of this application, the insulating plate 31 is located on the first side of the cover 12, and a heat dissipation part 122 is provided on the second side of the cover 12 away from the first side. The heat dissipation part 122 includes at least two heat dissipation fins 1221 spaced apart along the length direction. That is, at least two heat dissipation fins 1221 spaced apart along the length direction are provided on the side of the cover 12 away from the insulating plate 31. The heat generated on the control circuit board 50 is dissipated outward from the side away from the insulating plate 31, which can also reduce the impact of the heat in the energy storage device on the insulating plate 31.

[0051] In one embodiment of this application, the area S(1) of the heat dissipation fin 1221 satisfies 180 mm. 2 ≤S(1)≤5000mm 2 The area S(1) of the heat dissipation fin 1221 satisfies 180mm. 2 ≤S(1)≤5000mm 2 In this case, not only can the heat dissipation efficiency of a single heat dissipation fin 1221 be effectively guaranteed, but the heat dissipation fin 1221 can also be avoided from occupying too much space. In a specific embodiment, the area S(1) of the heat dissipation fin 1221 can be 180 mm². 2 360mm 2 1200mm 2 3200mm 2 5000mm 2 Specific values ​​are not limited here.

[0052] like Figure 6 As shown, in one embodiment of this application, the spacing d between adjacent heat dissipation fins 1221 satisfies 3mm ≤ d ≤ 20mm. When the spacing d between adjacent heat dissipation fins 1221 satisfies 3mm ≤ d ≤ 20mm, airflow dead zones are avoided between the heat dissipation fins 1221, thus preventing hot air from stagnating between them. This effectively ensures that hot air between the heat dissipation fins 1221 can flow outwards in a timely manner, thereby ensuring the heat dissipation effect of the heat dissipation fins 1221 and effectively maintaining the arrangement density of adjacent heat dissipation fins 1221, thereby improving the overall heat dissipation efficiency of the heat dissipation unit 122. In specific embodiments, the spacing d between adjacent heat dissipation fins 1221 can be specific values ​​such as 3mm, 6mm, 10mm, 15mm, and 20mm, and is not limited here.

[0053] In one embodiment of this application, the number of heat dissipation fins 1221 ranges from 2 to 10. When the number of heat dissipation fins 1221 ranges from 2 to 10, the heat dissipation efficiency of the heat dissipation unit 122 can be effectively guaranteed to meet the requirements, while also avoiding the heat dissipation unit 122 from occupying too much space. In specific embodiments, the number of heat dissipation fins 1221 can be specific values ​​such as 2, 5, 6, 8, and 10, and is not limited here.

[0054] like Figure 3 and Figure 7 As shown, in one embodiment of this application, the terminal assembly 40 includes a first terminal 41, a second terminal 42, and a third terminal 43; the first terminal 41 and the second terminal 42 are both electrically connected to the positive terminal of the battery pack 20 through the control circuit board 50; the third terminal 43 is electrically connected to the negative terminal of the battery pack 20 through the control circuit board 50.

[0055] That is, both the first terminal 41 and the second terminal 42 can be used as positive terminals, while the third terminal 43 is the negative terminal. During the normal operation of the energy storage device in this embodiment, a conventional conductive circuit can be formed, either external device - first terminal 41 - battery pack 20 - third terminal 43 - external device, or external device - second terminal 42 - battery pack 20 - third terminal 43 - external device, so that the energy storage device in this embodiment can discharge to the outside or the external device can charge the energy storage device in this embodiment. Under special operating conditions of the energy storage device in this embodiment, a large current will flow through the first terminal 41 and the second terminal 42 in a short time, forming a special conductive circuit, namely external device - first terminal 41 - control circuit board 50 - second terminal 42 - external device, to meet the requirements of special operating conditions.

[0056] like Figure 7 As shown, in one embodiment of this application, along the length direction, the first pole post 41, the second pole post 42 and the third pole post 43 are arranged sequentially on the first side of the insulating plate 31, and the distance L(1) between the first pole post 41 and the second pole post 42 is less than the distance L(2) between the second pole post 42 and the third pole post 43.

[0057] Since the first pole 41, the second pole 42 and the third pole 43 are arranged sequentially on the first side of the insulating plate 31 along the length direction, it is convenient for multiple connecting cables of external devices to be connected to the first pole 41, the second pole 42 and the third pole 43 respectively; and the distance L(1) between the first pole 41 and the second pole 42 is less than the distance L(2) between the second pole 42 and the third pole 43, which can effectively increase the distance between the second pole 42 and the third pole 43 and avoid short circuit between the second pole 42 and the third pole 43 when the energy storage device is in operation.

[0058] like Figure 7 As shown, in one embodiment of this application, the distance L(1) between the first pole 41 and the second pole 42 satisfies 20mm≤L(1)≤100mm. When the distance L(1) between the first pole 41 and the second pole 42 satisfies 20mm≤L(1)≤100mm, not only can short circuits between the first pole 41 and the second pole 42 be avoided, but multiple connecting cables of external devices can also be easily connected to the first pole 41 and the second pole 42 respectively, and the extension length of the insulating plate 31 is avoided to be too long, thus preventing the energy storage device of this embodiment from occupying too much space. In specific embodiments, the distance L(1) between the first pole 41 and the second pole 42 can be a specific value such as 20mm, 40mm, 50mm, 60mm, 90mm, or 100mm, which is not limited here.

[0059] like Figure 7 As shown, in one embodiment of this application, the distance L(2) between the second pole 42 and the third pole 43 satisfies 45mm≤L(2)≤200mm. When the distance L(2) between the second pole 42 and the third pole 43 satisfies 45mm≤L(2)≤200mm, not only can short circuits between the second pole 42 and the third pole 43 be avoided, but the extension length of the insulating plate 31 can also be avoided from being too long, thus preventing the energy storage device of this embodiment from occupying too much space. In specific embodiments, the distance L(2) between the second pole 42 and the third pole 43 can be specific values ​​such as 45mm, 67.5mm, 80mm, 120mm, and 200mm, which are not limited here.

[0060] like Figure 7 As shown, in one embodiment of this application, the control circuit board 50 includes a first circuit board 51 and a second circuit board 52; along the height direction, the first circuit board 51 is disposed on the side of the second circuit board 52 near the battery pack 20.

[0061] Among them, such as Figure 8As shown, the first circuit board 51 is provided with a positive electrode connection portion 511, a negative electrode connection portion 512, a first internal connection portion 513, and a third external connection portion 514; the positive terminal of the battery pack 20 is fixedly connected to the positive electrode connection portion 511 of the first circuit board 51; the third external connection portion 514 is electrically connected to the third terminal post 43; and the second circuit board 52 is provided with a second internal connection portion 521, a first external connection portion 522, and a second external connection portion 523. An electrical connector 61 is fixedly provided between the first internal connection portion 513 and the second internal connection portion 521; the first terminal post 41 is electrically connected to the first external connection portion 522 of the second circuit board 52, and the second terminal post 42 is electrically connected to the second external connection portion 523 of the second circuit board 52. Switching assemblies are arranged on both the first circuit board 51 and the second circuit board 52, and these assemblies are used to control the on / off state of related circuits.

[0062] During the normal operation of the energy storage device in this application embodiment, it can form a conventional conductive circuit: external device - first terminal 41 - first external connection part 522 of second circuit board 52 - second circuit board 52 - second internal connection part 521 of second circuit board 52 - first internal connection part 513 of first circuit board 51 - first circuit board 51 - positive terminal connection part 511 of first circuit board 51 - positive terminal of battery pack 20 - battery pack 20 - negative terminal of battery pack 20 - negative terminal connection part 512 of first circuit board 51 - first circuit board 51 - third connection part of first circuit board 51 - third terminal 43 - external device. External device - Second pole post 42 - Second external connection part 523 of second circuit board 52 - Second circuit board 52 - Second internal connection part 521 of second circuit board 52 - First internal connection part 513 of first circuit board 51 - First circuit board 51 - Positive connection part 511 of first circuit board 51 - Positive terminal of battery pack 20 - Battery pack 20 - Negative terminal of battery pack 20 - Negative connection part 512 of first circuit board 51 - First circuit board 51 - Third connection part of first circuit board 51 - Third pole post 43 - Conventional conductive circuit of external device, the switching assembly on the first circuit board 51 is used to control the on and off of the above conventional conductive circuit.

[0063] Under special operating conditions of the energy storage device in this application embodiment, a large current will flow through the first terminal 41 and the second terminal 42 in a short time, forming a special conductive circuit: external device - first terminal 41 - first external connection part 522 of second circuit board 52 - second circuit board 52 - second external connection part 523 of second circuit board 52 - second terminal 42 - external device, to meet the requirements of special operating conditions; the switching assembly on the second circuit board 52 is used to control the opening and closing of the above-mentioned special conductive circuit.

[0064] Compared to the aforementioned conventional conductive circuits, the special conductive circuits described above handle a larger current. Therefore, in one embodiment of this application, the number of switching components on the first circuit board 51 is less than the number of switching components on the second circuit board 52, or the continuous current-carrying capacity of the switching components on the first circuit board 51 is less than that of the switching components on the second circuit board 52. This allows the second circuit board 52 to withstand higher power to meet control requirements, preventing the switching components on the second circuit board 52 from burning out due to excessive overcurrent and ensuring the service life of the switching components on the second circuit board 52. Specifically, continuous current-carrying capacity refers to the current that a switching component can withstand for a long time under normal operating conditions, which is usually determined by the chip's on-resistance (Ron) and heat dissipation capacity. For example, in a specific embodiment, when the switching component is a TPW4157 chip, its supply voltage is 4.5V, and its typical on-resistance is 0.95Ω. Combining the thermal resistance (400℃ / W) and junction temperature limit (150℃), the continuous current-carrying capacity of this switching component can be calculated to be approximately 0.47A.

[0065] The switching components on the first circuit board 51 and the second circuit board 52 mentioned above can be MOSFETs, relays, or other structures, and are not limited here.

[0066] It is understood that during the operation of the energy storage device, both the first circuit board 51 and the second circuit board 52 of the control circuit board 50 will generate heat. Since in the energy storage device of this application embodiment, by splitting the control circuit board 50 into the first circuit board 51 and the second circuit board 52 and stacking them along the height direction and spacing them apart, the heat dissipation effect of the first circuit board 51 and the second circuit board 52 of the control circuit board 50 can be effectively improved, avoiding the operating temperature of the control circuit board 50 from being too high, thereby extending the service life of the control circuit board 50 and improving the working stability of the energy storage device.

[0067] It is understandable that, compared to a conventional conductive circuit, the special conductive circuit has a larger current flow. The switching components on the second circuit board 52 are used to control the on / off state of the special conductive circuit. Therefore, the second circuit board 52 generates more heat when the special conductive circuit is formed.

[0068] Therefore, as Figure 7 and Figure 9As shown, in one embodiment of this application, a heat-conducting part 63 is provided between the second circuit board 52 and the inner wall surface of the cover 12, and the heat-conducting part 63 is disposed opposite to the heat dissipation part 122. Therefore, when a large amount of heat is generated on the second circuit board 52 during the formation of the special conductive circuit, the heat-conducting part 63 can promptly transfer the heat generated by the second circuit board 52 to the heat dissipation part 122 on the cover 12, thereby promptly dissipating the heat generated on the second circuit board 52 from the heat dissipation part 122 to the outside, further preventing the heat generated by the second circuit board 52 from accumulating inside the energy storage device, and reducing the impact of the heat inside the energy storage device on the insulating plate 31.

[0069] Specifically, in one embodiment of this application, the heat-conducting part 63 is a thermally conductive adhesive. When the heat-conducting part 63 is a thermally conductive adhesive, it can not only transfer the heat generated by the second circuit board 52 to the heat dissipation part 122 on the cover 12, but also effectively bond and fix it to the second circuit board 52 and the cover 12 respectively, thereby avoiding the separation of the heat-conducting part 63 from the second circuit board 52 and the cover 12 after long-term operation, which would lead to problems such as poor heat transfer.

[0070] In one embodiment of this application, the thermal conductivity of the heat-conducting part 63 is T, and the range of T is 1.0 W / (m·K) ≤ T. When the thermal conductivity T of the heat-conducting part 63 is ≥ 1.0 W / (m·K), the heat-conducting part 63 can promptly transfer the heat generated by the second circuit board 52 to the heat dissipation part 122 on the cover 12, thereby promptly dissipating the heat generated on the second circuit board 52 from the heat dissipation part 122 to the outside, further preventing the heat generated by the second circuit board 52 from accumulating inside the energy storage device, and reducing the impact of the heat inside the energy storage device on the insulating plate 31. In specific embodiments, the thermal conductivity T of the heat-conducting part 63 can be selected from specific values ​​such as 1.0 W / (m·K), 2.0 W / (m·K), and 5.0 W / (m·K), and is not limited here.

[0071] like Figure 7 and Figure 8 As shown, in one embodiment of this application, an electrical connector 61 is fixedly disposed between the first inner connecting part 513 and the second inner connecting part 521. The length of the electrical connector 61 is greater than the distance between the first circuit board 51 and the second circuit board 52. When the first circuit board 51 and the second circuit board 52 vibrate vertically, the electrical connector 61 can have buffer redundancy, thereby minimizing the possibility of the electrical connector 61 being pulled apart due to vertical vibration between the first circuit board 51 and the second circuit board 52, thereby ensuring the working stability of the energy storage device of this application embodiment under vibration conditions. Furthermore, by extending the length of the electrical connector 61, the surface area of ​​the electrical connector 61 can also be effectively increased, thereby improving the heat dissipation performance of the electrical connector 61.

[0072] Furthermore, such as Figure 7 As shown, in one embodiment of this application, the electrical connector 61 is Z-shaped in the orthographic projection along the width direction. Because the electrical connector 61 is Z-shaped, it facilitates the electrical connection between the end of the electrical connector 61 and the first circuit board 51 or the second circuit board 52 at a vertical angle, and also facilitates the bending process of the electrical connector 61.

[0073] Specifically, such as Figure 7 As shown, in one embodiment of this application, the overall length of the electrical connector 61 is N(1), and the distance between the first circuit board 51 and the second circuit board 52 is N(2), where N(1) / N(2) satisfies 1≤N(1) / N(2)≤8. When the ratio N(1) / N(2) of the overall length N(1) of the electrical connector 61 and the distance N(2) between the first circuit board 51 and the second circuit board 52 is less than 1, the electrical connector 61 has no buffer redundancy, making it difficult to completely avoid the situation where the electrical connector 61 is pulled apart due to vertical vibration between the first circuit board 51 and the second circuit board 52; when the ratio N(1) / N(2) of the overall length N(1) of the electrical connector 61 and the distance N(2) between the first circuit board 51 and the second circuit board 52 is greater than 8, the overall length of the electrical connector 61 is too large, which not only easily increases the total resistance of the electrical connector 61, causing power loss, but also increases the overall material cost of the electrical connector 61. Therefore, when the ratio N(1) / N(2) of the overall length N(1) of the electrical connector 61 and the distance N(2) between the first circuit board 51 and the second circuit board 52 satisfies 1≤N(1) / N(2)≤8, it can not only ensure that the electrical connector 61 has a certain buffer redundancy, avoiding the situation where the electrical connector 61 is pulled apart due to vertical vibration between the first circuit board 51 and the second circuit board 52, but also effectively shorten the overall length of the electrical connector 61, thereby reducing the resistance and material cost of the electrical connector 61. In a specific embodiment, the ratio N(1) / N(2) of the overall length N(1) of the electrical connector 61 and the distance N(2) between the first circuit board 51 and the second circuit board 52 can be selected as specific values ​​such as 1, 2, 4, 5, 8, etc., without limitation.

[0074] like Figure 7As shown, in a specific embodiment, the distance N(2) between the first circuit board 51 and the second circuit board 52 satisfies 10mm≤N(2)≤40mm; when the distance N(2) between the first circuit board 51 and the second circuit board 52 is less than 10mm, the distance between the first circuit board 51 and the second circuit board 52 is too small, which easily creates a dead zone for airflow, and hot air is easily trapped between the first circuit board 51 and the second circuit board 52, resulting in a reduction in heat dissipation effect; when the distance N(2) between the first circuit board 51 and the second circuit board 52 is greater than 40mm, the distance between the first circuit board 51 and the second circuit board 52 is too large, which requires more space and affects the energy density of the energy storage device in this application embodiment.

[0075] Therefore, when the distance N(2) between the first circuit board 51 and the second circuit board 52 satisfies 10mm≤N(2)≤40mm, it can avoid the formation of an airflow dead zone between the first circuit board 51 and the second circuit board 52, prevent hot air from stagnating between the first circuit board 51 and the second circuit board 52, effectively ensure that the hot air between the first circuit board 51 and the second circuit board 52 can flow out in time, thereby ensuring the heat dissipation effect, and effectively reduce the arrangement space required for the first circuit board 51 and the second circuit board 52, thereby increasing the energy density of the energy storage device in this embodiment. In a specific embodiment, the distance N(2) between the first circuit board 51 and the second circuit board 52 can be selected from specific values ​​such as 10 mm, 15 mm, 18.75 mm, 25 mm, 32 mm, 40 mm, etc., and is not limited here.

[0076] Furthermore, in one embodiment of this application, the overall length N(1) of the electrical connector 61 satisfies 30mm≤N(1)≤150mm. When the overall length N(1) of the electrical connector 61 satisfies 30mm≤N(1)≤150mm, it not only ensures that the electrical connector 61 has a certain buffer redundancy, preventing the electrical connector 61 from being pulled apart due to vertical vibration between the first circuit board 51 and the second circuit board 52, but also effectively shortens the overall length of the electrical connector 61, thereby reducing the resistance and material cost of the electrical connector 61. In specific embodiments, the overall length N(1) of the electrical connector 61 can be selected from specific values ​​such as 30mm, 60mm, 80mm, 110mm, and 150mm, and is not limited here.

[0077] like Figure 8As shown, in one embodiment of this application, the overall width N(3) of the electrical connector 61 satisfies 10mm≤N(3)≤60mm. When the overall width N(3) of the electrical connector 61 is less than 10mm, the self-resistance of the electrical connector 61 is too high, which can easily cause excessive power loss and increase the heat generation of the electrical connector 61. When the overall width N(3) of the electrical connector 61 is greater than 60mm, the overall material cost of the electrical connector 61 will increase significantly. Therefore, when the overall width N(3) of the electrical connector 61 satisfies 10mm≤N(3)≤60mm, not only can the self-resistance of the electrical connector 61 be appropriately reduced to reduce power loss, but the heat generation of the electrical connector 61 can also be reduced, and the overall material cost of the electrical connector 61 can also be appropriately reduced. In specific embodiments, the overall width N(3) of the electrical connector 61 can be selected from specific values ​​such as 10mm, 24mm, 30mm, 45mm, and 60mm, which are not limited here.

[0078] like Figure 10 As shown, in one embodiment of this application, the projection of the second circuit board 52 onto the first circuit board 51 does not overlap with either the positive electrode connection portion 511 or the negative electrode connection portion 512. Since the projection of the second circuit board 52 onto the first circuit board 51 does not overlap with either the positive electrode connection portion 511 or the negative electrode connection portion 512, the second circuit board 52 will not affect the soldering of the solder joints at the positive electrode connection portion 511 and the negative electrode connection portion 512. Furthermore, since the positive electrode connection portion 511 and the negative electrode connection portion 512 on the first circuit board 51 generate a significant amount of heat during the energy storage process, the heat generated on the second circuit board 52 can be prevented from accumulating with the heat generated on the first circuit board 51, thus avoiding excessively high temperatures in certain areas and improving heat dissipation.

[0079] Furthermore, in one embodiment of this application, the minimum distance g between the projection of the second circuit board 52 on the first circuit board 51 and the positive electrode connection portion 511 and the negative electrode connection portion 512 is ≥ 3mm. When the minimum distance g between the projection of the second circuit board 52 on the first circuit board 51 and the positive electrode connection portion 511 and the negative electrode connection portion 512 is ≥ 3mm, the mutual influence between the heat generated on the second circuit board 52 and the heat generated on the positive electrode connection portion 511 and the negative electrode connection portion 512 on the first circuit board 51 can be further reduced, thereby lowering the operating temperature of the second circuit board 52 and the positive electrode connection portion 511 and the negative electrode connection portion 512 on the first circuit board 51 and improving the heat dissipation effect. In specific embodiments, the minimum distance g between the projection of the second circuit board 52 on the first circuit board 51 and the positive electrode connection portion 511 and the negative electrode connection portion 512 is ≥ 3mm, and can be selected from specific values ​​such as 3mm, 4mm, 6mm, and 10mm, without limitation.

[0080] like Figure 5 As shown, in one embodiment of this application, the insulating plate 31 has a plurality of first grooves 311 on the side facing the cover 12. Since the insulating plate 31 has a plurality of first grooves 311 on the side facing the cover 12, some air can be retained in the first grooves 311, thereby isolating the heat transfer between the insulating plate 31 and the cover 12 and minimizing the transfer of heat from the cover 12 to the insulating plate 31.

[0081] Similarly, such as Figure 3 and Figure 5 As shown, in one embodiment of this application, a plurality of second grooves 125 are provided on the side of the cover 12 facing the insulating plate 31. Since a plurality of second grooves 125 are provided on the side of the cover 12 facing the insulating plate 31, some air can also be stored in the second grooves 125, which can isolate the heat transfer between the insulating plate 31 and the cover 12, and minimize the heat transfer of the cover 12 to the insulating plate 31.

[0082] Furthermore, in one embodiment of this application, the depth H(1) of the first groove 311 satisfies 1mm≤H(1)≤10mm. When the depth H(1) of the first groove 311 is less than 1mm, the amount of air remaining in the first groove 311 is too small, making it difficult to isolate the heat transfer between the insulating plate 31 and the cover 12. When the depth H(1) of the first groove 311 is greater than 10mm, the thickness of the insulating plate 31 is large, requiring more space and affecting the energy density of the energy storage device in this embodiment. Therefore, when the depth H(1) of the first groove 311 satisfies 1mm≤H(1)≤10mm, it can ensure that the air remaining in the first groove 311 can isolate the heat transfer between the insulating plate 31 and the cover 12, while also reducing the space occupied by the insulating plate 31 and improving the energy density of the energy storage device in this embodiment. In specific embodiments, the depth H(1) of the first groove 311 can be selected from specific values ​​such as 1 mm, 2.5 mm, 4 mm, 8 mm, 10 mm, etc., and is not limited here.

[0083] Similarly, in one embodiment of this application, the depth H(2) of the second groove 125 satisfies 0.5mm ≤ H(2) ≤ 5mm. When the depth H(2) of the second groove 125 is less than 0.5mm, the amount of air remaining in the second groove 125 is too small, making it difficult to isolate the heat transfer between the insulating plate 31 and the cover 12; when the depth H(2) of the second groove 125 is greater than 5mm, the cover 12 is relatively thick, requiring more space and affecting the energy density of the energy storage device in this embodiment. Therefore, when the depth H(2) of the second groove 125 satisfies 0.5mm ≤ H(2) ≤ 5mm, it can ensure that the air remaining in the second groove 125 can isolate the heat transfer between the insulating plate 31 and the cover 12, while also reducing the space required for the cover 12 and improving the energy density of the energy storage device in this embodiment. In specific embodiments, the depth H(2) of the second groove 125 can be selected from specific values ​​such as 0.5mm, 1mm, 2.5mm, 4mm, and 5mm, which are not limited here.

[0084] This application also provides an electrical device that includes at least one of the aforementioned energy storage devices. It is understood that this electrical device can be any type of electrical device, such as an electric vehicle, an appliance with an energy storage device, or an energy storage device, and is not limited thereto.

[0085] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0086] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0087] It should be understood that while terms such as "first" or "second" may be used in this application to describe various elements, these elements are not limited by these terms; these terms are merely used to distinguish one element from another. The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms "a," "the," and "the" as used in one or more embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0088] In this document, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, and not to define the absolute position of these related parts. Terms such as "equal" and "same" are not strict mathematical and / or geometric limitations, and also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several subranges contained therein.

[0089] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0090] The above are merely specific embodiments 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. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An energy storage device, characterized in that, include: Box (11); The cover (12) together with the box (11) forms a receiving cavity, and the surface of the cover (12) is provided with a through hole (124) communicating with the receiving cavity. The battery pack (20) includes a plurality of cells (21) stacked along the width direction, and the battery pack (20) is disposed within the receiving cavity; An insulating plate (31) is disposed on the outer surface of the cover (12), the insulating plate (31) covers the through hole (124) and is sealed to the cover (12) by a sealing member (32); The pole assembly (40) is disposed through the insulating plate (31). The pole assembly (40) has an outer connection end (44) and an inner connection end (45). The inner connection end (45) extends into the receiving cavity through the through hole (124), and the outer connection end (44) protrudes from the outer surface of the insulating plate (31). A control circuit board (50) is disposed in the receiving cavity. The control circuit board (50) is electrically connected to the inner connection end (45) of the pole assembly (40). The control circuit board (50) is thermally coupled to the cover (12). The thermal conductivity of the cover (12) is greater than that of the insulating plate (31).

2. The energy storage device according to claim 1, characterized in that, Along the height direction, the top surface of the cover (12) away from the insulating plate (31) is provided with an exhaust port (121). And / or, the insulating plate (31) is located on the first side of the cover (12), and the cover (12) is provided with a heat dissipation part (122) on the second side away from the first side. The heat dissipation part (122) includes at least two heat dissipation fins (1221) spaced apart along the length direction.

3. The energy storage device according to claim 2, characterized in that, The area S(1) of the heat dissipation fins (1221) satisfies 180 mm². 2 ≤S(1)≤5000mm 2 .

4. The energy storage device according to claim 2, characterized in that, The spacing d between adjacent heat dissipation fins (1221) satisfies 3mm≤d≤20mm.

5. The energy storage device according to claim 2, characterized in that, The number of heat dissipation fins (1221) ranges from 2 to 10.

6. The energy storage device according to claim 2, characterized in that, The terminal assembly (40) includes a first terminal (41), a second terminal (42), and a third terminal (43); the first terminal (41) and the second terminal (42) are both electrically connected to the positive terminal of the battery pack (20) through the control circuit board (50); the third terminal (43) is electrically connected to the negative terminal of the battery pack (20) through the control circuit board (50).

7. The energy storage device according to claim 6, characterized in that, Along the length direction, the first pole (41), the second pole (42) and the third pole (43) are arranged sequentially on the first side of the insulating plate (31), and the distance L (1) between the first pole (41) and the second pole (42) is less than the distance L (2) between the second pole (42) and the third pole (43).

8. The energy storage device according to claim 7, characterized in that, The distance L(1) between the first pole post (41) and the second pole post (42) satisfies 20mm≤L(1)≤100mm.

9. The energy storage device according to claim 7, characterized in that, The distance L(2) between the second pole (42) and the third pole (43) satisfies 45mm≤L(2)≤200mm.

10. The energy storage device according to claim 6, characterized in that, The control circuit board (50) includes a first circuit board (51) and a second circuit board (52); along the height direction, the first circuit board (51) is disposed on the side of the second circuit board (52) close to the battery pack (20); Switching components are arranged on both the first circuit board (51) and the second circuit board (52). The number of switching components on the first circuit board (51) is less than the number of switching components on the second circuit board (52), or the continuous current carrying capacity of the switching components on the first circuit board (51) is less than the continuous current carrying capacity of the switching components on the second circuit board (52). The first circuit board (51) is provided with a positive electrode connection part (511), a negative electrode connection part (512), a first inner connection part (513) and a third outer connection part (514); the positive terminal of the battery pack (20) is fixedly connected to the positive electrode connection part (511) of the first circuit board (51); the positive terminal of the battery pack (20) is fixedly connected to the positive electrode connection part (511) of the first circuit board (51), and the third outer connection part (514) is electrically connected to the third terminal post (43); The second circuit board (52) is provided with a second inner connection part (521), a first outer connection part (522) and a second outer connection part (523). An electrical connector (61) is fixedly provided between the first inner connection part (513) and the second inner connection part (521). The first pole (41) is electrically connected to the first outer connection part (522) of the second circuit board (52), and the second pole (42) is electrically connected to the second outer connection part (523) of the second circuit board (52).

11. The energy storage device according to claim 10, characterized in that, A heat-conducting part (63) is provided between the second circuit board (52) and the inner wall surface of the cover (12), and the heat-conducting part (63) is disposed opposite to the heat dissipation part (122).

12. The energy storage device according to claim 11, characterized in that, The heat-conducting part (63) is a heat-conducting adhesive.

13. The energy storage device according to claim 11, characterized in that, The thermal conductivity of the heat-conducting part (63) is T, and the range of T is 1.0W / (m·K)≤T.

14. The energy storage device according to claim 10, characterized in that, The length of the electrical connector (61) is greater than the distance between the first circuit board (51) and the second circuit board (52).

15. The energy storage device according to claim 14, characterized in that, In the orthographic projection along the width direction, the electrical connector (61) is zig-shaped.

16. The energy storage device according to claim 14, characterized in that, The overall length of the electrical connector (61) is N(1), the distance between the first circuit board (51) and the second circuit board (52) is N(2), and N(1) / N(2) satisfies 1≤N(1) / N(2)≤8.

17. The energy storage device according to claim 16, characterized in that, The distance N(2) between the first circuit board (51) and the second circuit board (52) satisfies 10mm≤N(2)≤40mm, and the overall length N(1) of the electrical connector (61) satisfies 30mm≤N(1)≤150mm.

18. The energy storage device according to claim 14, characterized in that, The overall width N(3) of the electrical connector (61) satisfies 10mm≤N(3)≤60mm.

19. The energy storage device according to claim 10, characterized in that, The projection of the second circuit board (52) onto the first circuit board (51) does not overlap with the positive electrode connection (511) or the negative electrode connection (512).

20. The energy storage device according to claim 19, characterized in that, The minimum distance g between the projection of the second circuit board (52) onto the first circuit board (51) and the positive electrode connection (511) and the negative electrode connection (512) is ≥3mm.

21. The energy storage device according to any one of claims 1 to 20, characterized in that, The insulating plate (31) has a plurality of first grooves (311) on the side facing the cover (12); and / or, the cover (12) has a plurality of second grooves (125) on the side facing the insulating plate (31).

22. The energy storage device according to claim 21, characterized in that, The depth H(1) of the first groove (311) satisfies 1mm≤H(1)≤10mm.

23. The energy storage device according to claim 21, characterized in that, The depth H(2) of the second groove (125) satisfies 0.5mm≤H(2)≤5mm.

24. The energy storage device according to any one of claims 1 to 20, characterized in that, The thermal conductivity of the cover (12) is A, and the range of A is 50W / (m·K)≤A≤550W / (m·K); And / or, the thermal conductivity of the insulating plate (31) is B, and the range of B is 0.1W / (m·K)≤B≤0.5W / (m·K).

25. The energy storage device according to claim 24, characterized in that, The cover (12) is constructed to be made of at least one material selected from iron, aluminum, copper, iron alloy, aluminum alloy, and copper alloy, and / or the insulating plate (31) is constructed to be made of at least one material selected from rubber, glass fiber, nylon, ABS, PC, PP, PET, and PPE.

26. The energy storage device according to claim 24, characterized in that, The sealing element (32) is disposed at the edge of the insulating plate (31).

27. An electrical appliance, characterized in that, Includes the energy storage device according to any one of claims 1 to 26.

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