Electricity storage device and electric equipment

Abstract

The embodiment of the utility model provides an electricity storage device and electric equipment. The electricity storage device comprises a shell, a circuit board, a diverter, a tab support and a second bolt. The shell is provided with an accommodating cavity. A first notch is formed in the first edge of the circuit board. The diverter includes a first portion and a second portion. The first part is fixed and electrically connected with the circuit board, and at least part of the second part extends to the first gap. Along the thickness direction of the circuit board, the orthographic projection of the second part extending to the first gap part is located in the first gap. The circuit board is also provided with a second gap communicated with the first gap. The second gap is located on the side, away from the first edge, of the first gap and is close to the portion, located on the circuit board, of the diverter. The tab support is located on the side, away from the shunt, of the circuit board. And the second bolt penetrates through the first notch and is electrically connected with the second part and the tab bracket respectively. And the circuit board, the shunt and the tab bracket are arranged in the accommodating cavity. Therefore, damage to the circuit board caused by stress concentration can be avoided.

Description

Technical Field

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

[0002] Energy storage devices used in electrical equipment such as drones, electric vehicles, and power tools have their safety performance directly determining the safety of the equipment.

[0003] To ensure the safety of electrical equipment and improve the utilization rate of energy storage devices, a battery management system (BMS) protection board (i.e., circuit board) is generally installed in the energy storage device. This board serves as a link between the energy storage device and the electrical equipment, preventing overcharging and over-discharging of the energy storage device, extending the service life of the energy storage device, and monitoring the status of the energy storage device.

[0004] In related technologies, there are instances where circuit boards are damaged due to stress concentration during installation and use. Utility Model Content

[0005] In view of this, embodiments of this application provide an energy storage device and an electrical appliance, aiming to solve the problem of circuit boards being damaged due to stress concentration during installation and use.

[0006] In a first aspect, embodiments of this application provide an energy storage device, comprising a housing, a circuit board, a shunt, a tab holder, and a second bolt. The housing has a receiving cavity. A first notch is formed on a first edge of the circuit board. The shunt includes a first portion and a second portion. The first portion is fixed to and electrically connected to the circuit board, and at least a portion of the second portion extends into the first notch. Along the thickness direction of the circuit board, the orthographic projection of the portion of the second portion extending into the first notch lies within the first notch. The circuit board also has a second notch communicating with the first notch. The second notch is located on the side of the first notch away from the first edge, and is close to the portion of the shunt located on the circuit board. The tab holder is located on the side of the circuit board away from the shunt. The second bolt passes through the first notch and electrically connects the second portion and the tab holder, respectively. The circuit board, the shunt, and the tab holder are mounted within the receiving cavity.

[0007] In conjunction with the first aspect above, in one possible implementation, the second notch along the thickness direction of the circuit board does not overlap with the orthographic projection of the shunt; and / or, the length direction of the second notch is parallel to the length direction of the shunt.

[0008] In conjunction with the first aspect described above, in one possible implementation, the second notch is U-shaped.

[0009] In conjunction with the first aspect above, in one possible implementation, the second notch satisfies: 2 mm ≤ L ≤ 6 mm; and / or, 1.5 mm ≤ W ≤ 3 mm; and / or, 1.8 ≤ L / T ≤ 2.5. L is the length of the second notch, W is the width of the second notch, and T is the thickness of the circuit board.

[0010] In conjunction with the first aspect described above, in one possible implementation, the energy storage device further includes a first bolt. The first bolt passes through the circuit board and the first portion sequentially and is fixed to the housing. The first bolt and the second bolt are inserted in opposite directions; and / or, the minimum distance between the first bolt and the second notch is D1, where 8mm ≤ D1.

[0011] In conjunction with the first aspect described above, in one possible implementation, the energy storage device further includes a first output bar. One end of the first output bar is fixed between the first part and the housing, and the other end extends through the housing wall to the external space. The angle between the extending direction of the first output bar and the shunt is α, where α satisfies 70°≤α≤110°.

[0012] In conjunction with the first aspect described above, in one possible implementation, the surface of the first output row is provided with a plurality of bends.

[0013] In conjunction with the first aspect above, in one possible implementation, the shunt is located at the corner of the circuit board.

[0014] In conjunction with the first aspect described above, in one possible implementation, a first welding portion is provided between the first part and the circuit board; the minimum distance between the first welding portion and the first notch is D2, where D2 satisfies: 1≤D2 / T≤2, where T is the thickness of the circuit board, and / or, the area of ​​the first welding portion is S1, where S1 satisfies: 1 / 8≤S1 / S3≤1 / 4, where S3 is the area of ​​the orthographic projection of the first part along the thickness direction of the shunt, and / or, a second welding portion is provided between the second part and the circuit board, the second welding portion being located between the first notch and the first welding portion, the area of ​​the second welding portion being S2, where S2 satisfies: 1 / 8≤S2 / S4≤1 / 4, where S4 is the area of ​​the orthographic projection of the second part along the thickness direction of the shunt.

[0015] Secondly, embodiments of this application also provide an electrical device, including the aforementioned energy storage device.

[0016] Energy storage devices typically include a circuit board, housing, shunt, battery cells, electrical connectors, and tab supports. To make full use of space and achieve integrated installation of the circuit board, housing, shunt, and tab supports, and to realize the corresponding functions of these components, the first part of the shunt, located on the circuit board, is fixedly connected to the circuit board and housing, while the suspended second part is fixedly connected to the bus terminals.

[0017] During installation, after the first part is fixedly connected to the circuit board and the housing, when the second part is fixedly connected to the bus terminal of the electrode bracket, the suspended second part is subjected to a downward force. The part of the circuit board that is fixedly connected to the first part has a small deformation space. Under the action of this force, a bending moment is easily generated on the circuit board, which causes stress concentration at the concave corner of the circuit board, and then causes the circuit board to crack in this area.

[0018] According to the technical solution of this application, a second notch communicating with the first notch is provided at the concave corner of the circuit board adjacent to the first notch of the shunt. Thus, after the first part of the shunt is fixed to the circuit board, when the second part is fixedly connected to the tab bracket by the second bolt, when the suspended second part is subjected to a downward force, the part of the circuit board connected to the first part can deform to a certain extent along with the second part. This can alleviate and avoid stress concentration at the concave corner of the circuit board, thereby preventing cracks caused by stress concentration at the concave corner and thus avoiding damage to the circuit board. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the drawings only show some embodiments of this application and should not be considered as a limitation of the scope. It should also be understood that the same or similar reference numerals are used in the drawings to represent the same or similar elements. Furthermore, it should be understood that the drawings are merely schematic, and the dimensions and scale of the elements in the drawings are not necessarily precise.

[0020] Figure 1 This is a partial structural schematic diagram of an energy storage device according to an embodiment of this application.

[0021] Figure 2 This is a partial structural schematic diagram of another energy storage device according to one embodiment of this application.

[0022] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0023] Figure 4 This is a partial structural schematic diagram of another energy storage device according to an embodiment of this application.

[0024] Figure 5 This is a partial structural schematic diagram of another energy storage device according to one embodiment of the present application.

[0025] Figure 6 This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application.

[0026] Figure label:

[0027] 100. Energy storage devices;

[0028] 10. Shell; 11. Receiving cavity;

[0029] 20. Circuit board; 21. First edge; 22. First notch; 23. Concave corner; 24. Second notch;

[0030] 30. Diverter; 31. First section; 32. Second section; 33. Diverter segment;

[0031] 40. Electrode bracket; 41. Bus terminal;

[0032] 50. First bolt; 60. Second bolt; 70. First welded part; 80. First output bar; 90. Second welded part; 91. Battery cell; 92. Electrical connection bar. Detailed Implementation

[0033] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application. This application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0034] Energy storage devices typically include a circuit board, a housing, a shunt, battery cells, electrical connectors, and a tab holder. The electrical connectors can be integrally molded with the tab holder, for example, through injection molding. The battery cells are supported by the tab holder and have tabs mounted on them, which are electrically connected to the electrical connectors. The circuit board protects and manages the energy storage device, ensuring its safe, stable, and efficient operation. The tab holder, circuit board, shunt, and battery cells are housed within the housing's accommodating cavity.

[0035] In related technologies, in order to make full use of space and achieve integrated installation of circuit boards, housings, shunts and tab brackets, while realizing the corresponding functions of these components, the first part of the shunt located on the circuit board is fixedly connected to the circuit board and housing, and the suspended second part is fixedly connected to the bus terminal.

[0036] During installation, after the first part of the circuit board and the housing are fixedly connected, when the second part is fixedly connected to the bus terminal of the electrode bracket, the suspended second part is subjected to a downward force. The part of the circuit board fixed to the first part has little room for deformation. Under the action of this force, a bending moment is easily generated on the circuit board, causing stress concentration at the concave corner of the circuit board, which in turn leads to cracking of the circuit board in this area.

[0037] To address the aforementioned problems in related technologies, this application provides an energy storage device and an electrical appliance having the same. Optionally, the energy storage device may be a start-stop battery pack, a low-voltage battery pack, a power battery pack, or an energy storage module, etc. The following describes... Figures 1 to 6 The energy storage device provided in the embodiments of this application will be described.

[0038] It should be understood that there are many ways to implement this application, and it should not be construed as being limited to the embodiments described herein. The embodiments described herein are only for a more thorough and clear understanding of this application.

[0039] Exemplary energy storage device

[0040] refer to Figure 1 In a first aspect, embodiments of this application provide an energy storage device 100, which may include a housing 10, a circuit board 20, a shunt 30, a tab support 40, and a second bolt 60. A first notch 22 may be formed on the first edge 21 of the circuit board 20.

[0041] The shunt 30 may include a first portion 31 and a second portion 32. The first portion 31 is fixed to and electrically connected to the circuit board 20, and at least a portion of the second portion 32 extends into the first notch 22. Along the thickness direction of the circuit board 20, the orthographic projection of the portion of the second portion 32 extending into the first notch 22 lies within the first notch 22, meaning that the second portion 32 is at least partially suspended relative to the circuit board 20. The circuit board 20 also has a second notch 24 communicating with the first notch 22.

[0042] The second notch 24 is located on the side of the first notch 22 away from the first edge 21, and the second notch 24 is close to the portion of the shunt 30 located on the circuit board 20. That is, the second notch 24 is located at the concave corner 23 of the portion of the first notch 22 adjacent to the portion of the shunt 30 located on the circuit board 20.

[0043] The tab bracket 40 is located on the side of the circuit board 20 opposite to the shunt 30, meaning the tab bracket 40 and the shunt 30 are located on opposite sides of the circuit board 20. The second bolt 60 passes through the first notch 22 and electrically connects the second part 32 and the tab bracket 40, meaning the second part 32 and the tab bracket 40 are detachably fixed together by the second bolt 60. For example, the tab bracket 40 may have a pre-embedded nut, and the second bolt 60 is screwed onto this pre-embedded nut to achieve a fixed connection between the second part 32 and the tab bracket 40.

[0044] For example, refer to Figure 1The energy storage device 100 may further include multiple battery cells 91 and multiple electrical connectors 92. The multiple battery cells 91 are disposed within the receiving cavity 11. The multiple electrical connectors 92 can be integrally formed with the body of the tab support 40, for example, by injection molding. The tabs of the multiple battery cells 91 are electrically connected to their corresponding electrical connectors 92. The second part is electrically connected to the electrical connectors on the tab support 40.

[0045] The circuit board 20, the shunt 30, and the tab support 40 are installed in the accommodating cavity 11.

[0046] According to the technical solution of this application, a second notch 24 communicating with the first notch 22 is provided at the concave corner 23 of the shunt 30 on the circuit board 20, adjacent to the first notch 22. Thus, after the first part of the shunt 30 is fixed to the circuit board 20, when the second part is fixedly connected to the tab bracket by the second bolt, when the suspended second part 32 is subjected to a downward force, the portion of the circuit board 20 connected to the first part 31 can deform to a certain extent along with the second part 32. This can alleviate and avoid stress concentration at the concave corner 23 of the circuit board 20, thereby preventing cracks caused by stress concentration at the concave corner 23 and thus avoiding damage to the circuit board 20.

[0047] In the above text, the first edge 21 can be any edge of the circuit board 20. Those skilled in the art can choose according to the needs of specific application scenarios, and this application does not impose any restrictions on this.

[0048] For example, the first part 31 and the second part 32 of the splitter 30 are connected together by a splitting section 33. For example, the first part 31, the second part 32 and the splitting section 33 are an integral structure, with the first part 31 and the second part 32 located at opposite ends of the splitting section 33.

[0049] For example, the shunt 30 can be made of copper or its alloy. The detailed structure of the shunt 30 can be found in conventional configurations in the art and will not be described further here.

[0050] refer to Figure 2 A first solder joint 70 (e.g., solder strip) may be provided between the first part 31 and the circuit board 20. The minimum distance between the first solder joint 70 and the first notch 22 is D2, which can satisfy: 1≤D2 / T≤2, for example 1.2, 1.4, 1.6 or 1.8, etc. T is the thickness of the circuit board 20.

[0051] To ensure the shunt 30 is securely fixed on the circuit board 20 and to ensure its functions such as current measurement, signal distribution, circuit protection, and load balancing, the shunt 30 is soldered onto the circuit board 20. This prevents the shunt 30 from shifting or falling off due to vibration or impact, which could lead to a decrease in its performance or damage.

[0052] During soldering, the ratio of the distance between the first soldering part 70 and the first notch 22 between the first part 31 of the shunt 30 and the circuit board 20 and the thickness of the circuit board 20 is controlled within a reasonable range. This can make the distance match the strength of the circuit board 20, and avoid the cooling rate of the side of the soldering position near the edge of the first notch 22 being too fast, which is much faster than the cooling rate of the other side of the soldering position. This would cause uneven soldering stress on both sides of the soldering position, resulting in warping and deformation of the circuit board 20, or the distance from the edge of the first notch 22 being too far to facilitate soldering.

[0053] The area of ​​the first welded part 70 can be S1, where S1 satisfies: 1 / 8≤S1 / S3≤1 / 4, for example 1 / 7, 1 / 6 or 1 / 5, etc., and S3 is the area of ​​the first part 31 projected orthogonally along the thickness direction of the distributor 30.

[0054] A second welding portion is provided between the second part 32 and the circuit board 20. The second welding portion is located between the first notch 22 and the first welding portion 70. The area of ​​the second welding portion is S2, which satisfies: 1 / 8≤S2 / S4≤1 / 4, for example, 1 / 7, 1 / 6 or 1 / 5, etc., and S4 is the area of ​​the second part 32 projected onto the thickness direction of the shunt 30.

[0055] In this way, the areas of the first and second welding parts are controlled within a reasonable range, avoiding the situation where the welding area is too small to guarantee the welding strength, or the welding area is too large to cause excessive welding heat, which affects the performance of the circuit board 20 and the shunt 30 in the welding area.

[0056] In one example, the following conditions can be met simultaneously: a first solder joint 70 can be provided between the first part 31 and the circuit board 20. The minimum distance between the first solder joint 70 and the first notch 22 is D2, and D2 can satisfy: 1≤D2 / T≤2. T is the thickness of the circuit board 20. The area of ​​the first solder joint 70 can be S1, and S1 satisfies: 1 / 8≤S1 / S3≤1 / 4, where S3 is the area of ​​the first part 31 projected orthogonally along the thickness direction of the shunt 30. A second solder joint is provided between the second part 32 and the circuit board 20, and the second solder joint is located between the first notch 22 and the first solder joint 70. The area of ​​the second solder joint is S2, and S2 satisfies: 1 / 8≤S2 / S4≤1 / 4, where S4 is the area of ​​the second part 32 projected orthogonally along the thickness direction of the shunt 30.

[0057] Continue to refer to Figure 2The shunt 30 is located at the corner of the circuit board 20. Here, the corner can be understood as the area where the two edges of the circuit board intersect. By placing the shunt 30 in the corner region of the circuit board 20, the corner region becomes a relatively free deformation region, meaning that the corner region has a greater degree of freedom of deformation compared to other areas of the circuit board 20. In this way, greater deformation can occur during installation, further alleviating stress concentration on the circuit board 20 caused by installation.

[0058] refer to Figure 4 Along the thickness direction of the circuit board 20, the second notch 24 and the orthographic projection of the shunt 30 do not overlap. That is, the second notch 24 can be exactly adjacent to or at a certain distance from the edge of the shunt adjacent to the second notch 24. In this way, the circuit board 20 and the shunt can be guaranteed to have sufficient contact area to ensure connection stability, and the second notch 24 is not blocked, which can improve the connection stability of the shunt 30.

[0059] The length direction of the second notch 24 is parallel to the length direction of the shunt 30.

[0060] The length direction of the second notch 24 provided at the concave corner 23 is parallel to the length direction of the shunt 30. In this way, when the first part 31 is fixedly connected to the circuit board 20 and the housing 10, and the second part 32 is fixedly connected to the bus terminal 41 of the electrode bracket 40, when the suspended second part 32 is subjected to a downward force, the circuit board 20 can deform to a greater extent with the second part 32. This can alleviate and avoid stress concentration at the concave corner 23 to the greatest extent, and better prevent the circuit board 20 from being damaged due to cracks caused by stress concentration at the concave corner 23.

[0061] In addition, the length and width of the second notch 24 can be the same, in which case the length or width direction of the second notch 24 can be parallel to the length direction of the splitter 30.

[0062] Of course, those skilled in the art can also set the length direction of the second notch 24 to have an angle greater than 0° with the length direction of the splitter 30 according to the needs of specific application scenarios.

[0063] In one example, it can be achieved that, on the orthographic projection plane of the plane containing the circuit board 20, the orthographic projections of the second notch 24 and the shunt 30 do not overlap, and the length direction of the second notch 24 is parallel to the length direction of the shunt 30. In this case, both technical effects can be achieved simultaneously. For specific technical effects, please refer to the description above; they will not be repeated here.

[0064] For example, refer to Figure 4The second notch 24 is U-shaped. The U-shaped shape of the second notch 24 allows the edge of the second notch 24 to smoothly transition to the end of the second notch 24, which can better avoid stress concentration at the concave corner 23, and thus prevent cracks caused by stress concentration at the concave corner 23 from damaging the circuit board 20.

[0065] It is understandable that the second notch 24 can also be other shapes, such as semi-ellipse, rectangle, square or arc, wherein the ends of the rectangular and square second notch 24 can be chamfered.

[0066] The second notch 24 can satisfy: 2 mm ≤ L ≤ 6 mm, for example, 3 mm, 4 mm or 5 mm, etc. Here, L is the length of the second notch 24.

[0067] Furthermore, the second notch 24 can satisfy: 1.5 mm ≤ W ≤ 3 mm, for example, 1.8 mm, 2.0 mm, 2.2 mm, 2.5 mm, or 2.8 mm, etc. Here, W is the width of the second notch 24.

[0068] Then, the second notch 24 can also satisfy: 1.8≤L / T≤2.5, for example, 1.9 mm, 2.0 mm, 2.2 mm, 2.3 mm or 2.4 mm, etc. Here, T is the thickness of the circuit board 20, and the definition of L is as described above.

[0069] In one example, the second notch 24 can simultaneously satisfy: 2 mm ≤ L ≤ 6 mm, 1.5 mm ≤ W ≤ 3 mm, and 1.8 ≤ L / T ≤ 2.5. Please refer to the description above for the meaning of each letter; it will not be repeated here.

[0070] In this way, by controlling the size of the second notch 24 within a reasonable range, stress concentration at the concave corner 23 of the circuit board 20 can be alleviated and avoided, and the utilization rate of the circuit board 20 can be guaranteed. This avoids the situation where the size of the second notch 24 is too small and cannot effectively avoid stress concentration at the concave corner 23, or where the size of the second notch 24 is too large and weakens the overall strength of the circuit board 20.

[0071] Meanwhile, the relationship between the length L of the second notch 24 and the thickness T of the circuit board 20 is controlled within a reasonable range, so that the length of the second notch 24 matches the strength of the circuit board 20. Therefore, stress concentration at the concave corner 23 can be alleviated and avoided, and the overall strength of the circuit board 20 can be prevented from being significantly weakened when the length L of the second notch 24 is relatively large compared to the thickness of the circuit board 20.

[0072] In addition, this avoids the situation where, when the length L of the second notch 24 is relatively small compared to the thickness of the circuit board 20, after the first part 31 is fixedly connected to the circuit board 20 and the housing 10, and the second part 32 is fixedly connected to the bus terminal 41 of the tab bracket 40, the suspended second part 32 is subjected to a downward force, and the circuit board 20 cannot deform properly along with the second part 32, thus failing to effectively alleviate the stress concentration at the concave corner 23.

[0073] refer to Figure 3 and Figure 4 The energy storage device 100 may also include a first bolt 50, which passes through the circuit board 20 and the first part 31 in sequence and is fixed to the housing 10. The first bolt 50 and the second bolt 60 are inserted in opposite directions.

[0074] The installation directions of the first bolt 50 and the second bolt 60 are opposite, that is, the first part 31 of the diverter 30 is opposite to the fixing direction of the second direction, which can offset their installation errors and stress to a certain extent and is beneficial to the stability of the connection.

[0075] Of course, the first bolt 50 and the second bolt 60 can also be installed in the same direction.

[0076] The minimum distance between the first bolt 50 and the second notch 24 is D1, where 8 mm ≤ D1, for example, 9 mm, 10 mm, 12 mm, 15 mm, or 20 mm. That is, the circuit board 20 may have a hole (not shown in the figure), through which the first bolt 50 passes to fix the circuit board 20 to the housing 10, and the minimum distance between the hole and the second notch 24 can be D1, where 8 mm ≤ D1.

[0077] In this way, the minimum distance between the first bolt 50 and the second notch 24 is controlled within a suitable range, that is, the minimum distance between the hole on the circuit board 20 and the second notch 24 is controlled within a suitable range, so as to avoid the distance between the two being too small, which would greatly weaken the strength of the circuit board 20 in the area where they are located and cause damage to the circuit board 20.

[0078] In one example, the energy storage device 100 may also include a first bolt 50, which passes through the circuit board 20 and the first part 31 in sequence and is fixed to the housing 10. The first bolt 50 and the second bolt 60 are inserted in opposite directions, and the minimum distance between the first bolt 50 and the second notch 24 is D1, where 8mm ≤ D1.

[0079] refer to Figures 1 to 3 The first bolt 50 is installed towards the housing 10, and the second bolt 60 is installed away from the housing 10.

[0080] The first bolt 50 is installed facing the housing 10, while the second bolt 60 is installed away from the housing 10. This allows the first bolt 50 and the second bolt 60 to have opposite installation directions, meaning the first part 31 and the second part 32 of the distributor 30 are fixed in opposite directions. This can, to some extent, offset installation errors and stress, improving the stability of the connection. Simultaneously, the first bolt 50 can be fixed from bottom to top in a pre-embedded nut within the housing 10, avoiding the need to drill holes in the housing 10 for installation. This also avoids the need for sealing at the drilled locations, simplifying the manufacturing process and improving the sealing performance of the energy storage device 100.

[0081] Next, refer to Figures 1 to 3 In some embodiments, the energy storage device 100 further includes a first output bar 80. One end of the first output bar 80 is fixed between the first portion 31 and the housing 10, and the other end extends through the shell wall of the housing 10 to the external space. That is, the first bolt sequentially fixes the circuit board 20, the first portion 31, one end of the first output bar 80, and the housing 10 together.

[0082] The angle between the extension direction of the first output row 80 and the shunt 30 is α. For example, the angle between the length direction of the first output row 80 and the shunt 30 is α. α satisfies 70°≤α≤110°. In this way, the first output row 80 is relatively long. After the circuit board 20, the first part 31, one end of the first output row 80 and the housing 10 are sequentially fixed together by the first bolt, and the suspended second part is fixed to the tab bracket from the opposite direction by the second bolt, the first output row can better disperse the torsional force formed by the pulling between the connecting parts.

[0083] Continue to refer to Figure 1 For example, the surface of the first output row 80 is provided with multiple bends. For instance, four bends may be provided on the first output row. In this way, the torsional force mentioned above can be better buffered by multiple bends.

[0084] It should be noted that this application does not limit the number of bends on the first output row 80, and can also set other numbers according to the needs of specific application scenarios.

[0085] To better understand the technical solution of this application, the following is combined with... Figures 1 to 6 The energy storage device 100 of this application will be described in detail.

[0086] refer to Figures 1 to 6An embodiment of this application provides an energy storage device 100, which may include a housing 10, a circuit board 20, a shunt 30, a tab support 40, and a second bolt 60. A first notch 22 may be formed on the first edge 21 of the circuit board 20. The shunt 30 is located at a corner of the circuit board 20.

[0087] The shunt 30 may include a first portion 31 and a second portion 32. The first portion 31 is fixed to and electrically connected to the circuit board 20, and at least a portion of the second portion 32 extends into the first notch 22. The orthographic projection of the portion of the second portion 32 extending into the first notch 22 along the thickness direction of the circuit board 20 lies within the first notch 22. The circuit board 20 also has a second notch 24 communicating with the first notch 22.

[0088] The second notch 24 is located on the side of the first notch 22 away from the first edge 21, and the second notch 24 is close to the portion of the shunt 30 located on the circuit board 20.

[0089] The tab bracket 40 is located on the side of the circuit board 20 away from the shunt 30, that is, the tab bracket 40 and the shunt 30 are located on opposite sides of the circuit board 20. The tab bracket 40 is provided with a pre-embedded nut, and the second bolt 60 is screwed to the pre-embedded nut to realize the fixed connection between the second part 32 and the tab bracket 40.

[0090] The energy storage device may also include multiple battery cells 91 and multiple electrical connectors 92. The multiple battery cells 91 are disposed within the receiving cavity 11. The multiple electrical connectors 92 can be integrally formed with the body of the tab support 40, for example, by injection molding. The tabs of the multiple battery cells 91 are electrically connected to their corresponding electrical connectors 92. The second part is electrically connected to the electrical connectors on the tab support 40.

[0091] The circuit board 20, the shunt 30, and the tab support 40 are installed in the accommodating cavity 11.

[0092] The first part 31 and the second part 32 of the shunt 30 are connected together by the shunt section 33. The shunt 30 can be made of copper.

[0093] A first solder joint 70 may be provided between the first part 31 and the circuit board 20. The minimum distance between the first solder joint 70 and the first notch 22 is D2, which can satisfy: 1≤D2 / T≤2, for example 1.2, 1.4, 1.6 or 1.8, etc. T is the thickness of the circuit board 20.

[0094] The area of ​​the first welded part 70 can be S1, where S1 satisfies: 1 / 8≤S1 / S3≤1 / 4, and S3 is the area of ​​the first part 31 projected orthogonally along the thickness direction of the distributor 30.

[0095] A second welding portion is provided between the second part 32 and the circuit board 20. The second welding portion is located between the first notch 22 and the first welding portion 70. The area of ​​the second welding portion is S2, which satisfies: 1 / 8≤S2 / S4≤1 / 4, where S4 is the area of ​​the second part 32 projected onto the thickness direction of the shunt 30.

[0096] Along the thickness direction of the circuit board 20, the second notch 24 and the orthographic projection of the shunt 30 do not overlap. The length direction of the second notch 24 is parallel to the length direction of the shunt 30, and the second notch 24 is U-shaped.

[0097] The second notch 24 can satisfy: 2 mm ≤ L ≤ 6 mm, 1.5 mm ≤ W ≤ 3 mm, and 1.8 ≤ L / T ≤ 2.5. Here, L is the length of the second notch 24, W is the width of the second notch 24, and T is the thickness of the circuit board 20.

[0098] The energy storage device 100 may further include a first bolt 50, which passes through the circuit board 20 and the first portion 31 sequentially and is fixed to the housing 10. The insertion directions of the first bolt 50 and the second bolt 60 are opposite. The installation direction of the first bolt 50 faces the housing 10, and the installation direction of the second bolt 60 faces away from the housing 10. The minimum distance between the first bolt 50 and the second notch 24 is D1, where 8 mm ≤ D1. That is, the circuit board 20 may have a hole (not shown in the figure), and the first bolt 50 passes through the hole to fix the circuit board 20 to the housing 10. The minimum distance between the hole and the second notch 24 can be D1, where 8 mm ≤ D1.

[0099] The energy storage device 100 also includes a first output bar 80. One end of the first output bar 80 is fixed between the first part 31 and the housing 10, and the other end extends through the shell wall of the housing 10 to the external space. That is, the first bolts sequentially fix the circuit board 20, the first part 31, one end of the first output bar 80 and the housing 10 together.

[0100] The angle between the extending direction of the first output row 80 and the splitter 30 is α. For example, the angle between the length direction of the first output row 80 and the splitter 30 is α. α satisfies 70°≤α≤110°. The surface of the first output row 80 is provided with four bends.

[0101] In this application, the energy storage device 100 can be a battery module, a start-stop battery pack, a power battery pack, or an energy storage module, etc.

[0102] It should be noted that other aspects of the construction of the energy storage device 100 can refer to the conventional construction of energy storage devices 100 in the field. For the sake of brevity, this application will not elaborate on them further.

[0103] Exemplary electrical equipment

[0104] An embodiment of this application also provides an electrical device including the battery 100 described above. The electrical device has the corresponding effects of the battery described above, which will not be repeated here.

[0105] It should be noted that the electrical equipment mentioned in this application can be energy storage equipment, such as energy storage cabinets, or power consuming equipment, such as automobiles, drones, and power tools.

[0106] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0107] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0108] It should be understood that the term "comprising" and its variations as used in this application are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0109] It should be understood that although terms such as “first” or “second” may be used in this application to describe various elements (such as a first edge and a second edge), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0110] It should be noted that, in the description of this application, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0111] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0112] The scope of protection of this application is not limited to the above embodiments. Any variations or substitutions that can be 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 (100), characterized in that, include The housing (10) has a receiving cavity (11); A circuit board (20), wherein a first notch (22) is formed on the first edge (21) of the circuit board (20); A shunt (30) comprising a first part (31) and a second part (32), the first part (31) being fixed and electrically connected to the circuit board (20), at least a portion of the second part (32) extending to the first notch (22), the orthographic projection of the portion of the second part (32) extending to the first notch (22) along the thickness direction of the circuit board (20) being located within the first notch (22), the circuit board (20) also having a second notch (24) communicating with the first notch (22), the second notch being located on the side of the first notch (22) away from the first edge (21), and the second notch (24) being close to the portion of the shunt (30) located on the circuit board (20); A tab holder (40) is located on the side of the circuit board (20) away from the shunt (30); A second bolt (60) passes through the first notch (22) and electrically connects the second part (32) and the electrode bracket (40); and The circuit board (20), the shunt (30), and the tab support (40) are installed in the accommodating cavity (11).

2. The energy storage device (100) according to claim 1, characterized in that, Along the thickness direction of the circuit board (20), the second notch (24) does not overlap with the orthographic projection of the shunt (30); and / or The length direction of the second notch (24) is parallel to the length direction of the splitter (30).

3. The energy storage device (100) according to claim 2, characterized in that, The second gap (24) is U-shaped.

4. The energy storage device (100) according to claim 1, characterized in that, The second gap (24) satisfies: 2mm≤L≤6mm; and / or 1.5mm≤W≤3mm; and / or 1.8≤L / T≤2.5; where, L is the length of the second notch (24), W is the width of the second notch (24), and T is the thickness of the circuit board (20).

5. The energy storage device (100) according to claim 1, characterized in that, It also includes a first bolt (50), which passes through the circuit board (20) and the first part (31) in sequence and is fixed to the housing (10); The first bolt (50) and the second bolt (60) are inserted in opposite directions; and / or The minimum distance between the first bolt (50) and the second notch (24) is D1, 8mm≤D1.

6. The energy storage device (100) according to claim 1, characterized in that, It also includes a first output row (80), one end of which is fixed between the first part (31) and the housing (10), and the other end extends through the shell wall of the housing (10) to the external space; the angle between the extension direction of the first output row (80) and the splitter (30) is α, and α satisfies 70°≤α≤110°.

7. The energy storage device (100) according to claim 6, characterized in that, The surface of the first output row (80) is provided with multiple bends.

8. The energy storage device (100) according to claim 1, characterized in that, The shunt (30) is located at the corner of the circuit board (20).

9. The energy storage device (100) according to any one of claims 1 to 8, characterized in that, A first solder joint (70) is provided between the first part (31) and the circuit board (20); the minimum distance between the first solder joint (70) and the first notch (22) is D2, and D2 satisfies: 1≤D2 / T≤2, where T is the thickness of the circuit board (20), and / or The area of ​​the first welded portion (70) is S1, where S1 satisfies: 1 / 8 ≤ S1 / S3 ≤ 1 / 4, and S3 is the area of ​​the orthographic projection of the first portion (31) along the thickness direction of the distributor (30), and / or A second welding part (90) is provided between the second part (32) and the circuit board (20). The second welding part (90) is located between the first notch (22) and the first welding part (70). The area of ​​the second welding part (90) is S2, which satisfies: 1 / 8≤S2 / S4≤1 / 4. S4 is the area of ​​the second part (32) projected onto the thickness direction of the splitter (30).

10. An electrical appliance, characterized in that, Includes the energy storage device (100) according to any one of claims 1 to 9.

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