Battery pack and energy storage equipment

Abstract

The utility model relates to the technical field of battery packs, and particularly discloses a battery pack and energy storage equipment. The battery pack comprises a conducting bar, a circuit board, an electric connecting piece and a plurality of battery cells. And the conducting bar is connected with the poles of the at least two battery cells. The circuit board is provided with a first side and a second side which are opposite, the conducting bar is located on the first side, and the circuit board is provided with a through hole penetrating through the first side and the second side. The electric connecting piece comprises a first connecting part, a second connecting part and a blocking part arranged between the first connecting part and the second connecting part. The first connecting part is connected with the conducting bar, and the second connecting part penetrates through the through hole. The plugging part is configured to be pressed on the circuit board and cover the opening of the through hole in the first side, so that the tin liquid poured into the through hole can be plugged in the through hole to connect the second connecting part and the circuit board. According to the battery pack, the risk that tin liquid falls from the through hole when the circuit board and the electric connecting piece are mutually welded can be reduced, so that the risk that the electric connecting piece and the circuit board are subjected to pseudo soldering is reduced.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and more particularly to a battery pack and energy storage device. Background Technology

[0002] A battery pack typically consists of battery cells, aluminum busbars, and a circuit board. The aluminum busbars are welded to the terminals of the battery cells, and are electrically connected to the circuit board via nickel strips. Specifically, the nickel strips need to pass through through-holes in the circuit board before being soldered to it. However, during the assembly of the circuit board and the aluminum busbars, multiple nickel strips often need to be aligned simultaneously. Therefore, the through-holes on the circuit board are often quite large. This causes molten solder to easily drip through the through-holes during the soldering of the nickel strips, resulting in poor soldering between the nickel strips and the circuit board, thus affecting the battery pack's performance. Utility Model Content

[0003] In view of this, this application provides a battery pack and energy storage device to improve the technical problem of poor soldering between nickel sheets and circuit boards caused by molten solder falling during traditional nickel sheet and circuit board soldering.

[0004] One embodiment of this application provides a battery pack. The battery pack includes a busbar, a circuit board, electrical connectors, and multiple battery cells. The busbar connects the terminals of at least two battery cells. The circuit board has a first side and a second side facing away from each other, with the busbar located on the first side. The circuit board has a through-hole extending through the first and second sides. The electrical connector includes a first connecting portion, a second connecting portion, and a sealing portion disposed between the first and second connecting portions. The first connecting portion is connected to the busbar, and the second connecting portion passes through the through-hole. The sealing portion is configured to press against the circuit board and cover the opening of the through-hole on the first side, so that molten solder poured into the through-hole can be sealed within the through-hole to connect the second connecting portion and the circuit board.

[0005] In the aforementioned battery pack, during the assembly of the circuit board and the busbar, the sealing portion of the electrical connector can press against the circuit board and cover the opening of the through-hole on the first side, thus sealing the molten solder poured into the through-hole within it. This reduces the risk of molten solder falling through the through-hole during soldering of the circuit board and the electrical connector, thereby reducing the risk of poor soldering between the electrical connector and the circuit board. Production and installation personnel can appropriately increase the size of the through-hole in the circuit board, thereby reducing the difficulty of aligning the circuit board with the electrical connector during assembly and improving the operability of circuit board installation.

[0006] In some embodiments of this application, the first connecting portion is configured to be elastically deformable, and the sealing portion is configured to hold the circuit board under the elastic force of the first connecting portion. Alternatively, the sealing portion is configured to be elastically deformable, and the sealing portion is able to hold the circuit board under its own elastic force.

[0007] The sealing portion maintains pressure on the circuit board through its elasticity. This serves two purposes: firstly, it ensures the sealing portion always covers the opening of the through-hole on the first side, improving the reliability of the sealing; secondly, it reduces the risk of gaps forming between the sealing portion and the circuit board due to excessive impact force of the molten solder during pouring, allowing molten solder to leak out of the through-hole, thus further reducing the risk of poor soldering between electrical connectors and the circuit board.

[0008] In some embodiments of this application, the sealing portion includes a first elastic bending segment and a second elastic bending segment connected to each other, the bending directions of the first elastic bending segment and the second elastic bending segment being opposite. The first elastic bending segment is connected to a first connecting portion and / or a second connecting portion, and the second elastic bending segment is connected to the first connecting portion and / or the second connecting portion. Both the first elastic bending segment and the second elastic bending segment are pressed against the circuit board and together cover the opening of the through hole on the first side.

[0009] The sealing section, through its own structure (specifically, the first elastic bending section and the second elastic bending section), can press against the circuit board and cover the opening of the through hole on the first side. Production and installation personnel do not need to make structural changes to the first connection section, which helps ensure the structural strength of the first connection section and extends its service life.

[0010] In some embodiments of this application, the first elastic bending segment includes a first arc segment and a first and a second branch segment connected to both ends of the first arc segment. The second elastic bending segment includes a second arc segment and a third and a fourth branch segment connected to both ends of the second arc segment. The opening orientation of the first arc segment is opposite to that of the second arc segment. The first branch segment is connected to the first connecting portion, the second branch segment is connected to the third branch segment, and the fourth branch segment is connected to the second connecting portion. The second and fourth branch segments are both pressed onto the circuit board and, together with the third branch segment, cover the opening of the through hole on the first side.

[0011] Both the first and second elastic bending sections adopt a "circular arc section + two support sections" structure. The circular arc section can provide a uniform stress distribution, reducing the risk of fatigue fracture in the first and second elastic bending sections.

[0012] In some embodiments of this application, before the electrical connector is pressed onto the circuit board, the sum of the distance between the first and second branches and the distance between the third and fourth branches along the penetration direction of the second connection is D1, where D1 = 0.8 mm - 1.2 mm.

[0013] Firstly, sufficient elastic deformation space can be reserved between the first and second elastic bending sections to provide sufficient elastic force, thereby ensuring that the first and second elastic bending sections can keep pressing the circuit board; secondly, it is beneficial to absorb the assembly errors generated during the assembly of the circuit board and the busbar.

[0014] In some embodiments of this application, the electrical connector further includes a deformation portion, one end of which is connected to the first connection portion and the other end of which is connected to the sealing portion. The deformation portion has an arc-shaped structure and is configured to deform when the battery cell expands or vibrates, so as to absorb the displacement difference between the first connection portion and the sealing portion.

[0015] By setting the deformation part, the rigid connection between the first connecting part and the sealing part can be transformed into a flexible connection, which helps to reduce the risk of electrical connector breakage caused by stress concentration between the first connecting part and the sealing part, and extends the service life of the electrical connector.

[0016] In some embodiments of this application, a portion of the second connection extends out of the through hole and is exposed on the circuit board.

[0017] By extending the second connection portion out of the through hole and exposing it to the circuit board, production and installation personnel can solder the circuit board and electrical connectors in a larger operating space, which helps to improve the convenience of operation for production and installation personnel.

[0018] In some embodiments of this application, the height of the second connection portion exposed above the circuit board along the penetration direction of the second connection portion is greater than 3mm.

[0019] By limiting the height of the second connector exposed on the circuit board to more than 3mm, more space can be provided for soldering the circuit board and the second connector, thereby improving the reliability of the soldering between the electrical connector and the circuit board.

[0020] In some embodiments of this application, the electrical connector is configured as an integrally formed structure, which can not only reduce the processing steps of the electrical connector and improve assembly efficiency, but also increase the structural strength of the electrical connector and extend its service life.

[0021] In some embodiments of this application, the battery pack further includes an insulating sheet mounted on the circuit board and located on the first side. A second connecting portion passes through the insulating sheet and a through-hole, and a sealing portion presses against the insulating sheet to press the insulating sheet against the circuit board. The insulating sheet helps reduce the risk of short circuits on the circuit board, thereby protecting it.

[0022] One embodiment of this application provides an energy storage device. The energy storage device includes a housing and a battery pack as described in any of the foregoing embodiments, the battery pack being installed within the housing.

[0023] The aforementioned energy storage device uses the aforementioned battery pack. When the circuit board is assembled with the busbar, the sealing portion in the electrical connector can press against the circuit board and cover the opening of the through-hole on the first side, thus sealing the molten solder poured into the through-hole. This reduces the risk of molten solder falling through the through-hole during soldering of the circuit board and electrical connector, thereby reducing the risk of poor soldering between the electrical connector and the circuit board. Production and installation personnel can appropriately increase the size of the through-hole in the circuit board, thereby reducing the difficulty of aligning the circuit board with the electrical connector during assembly and improving the operability of circuit board installation. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0025] Figure 1 A schematic diagram of the battery pack structure is provided for one embodiment of this application;

[0026] Figure 2 for Figure 1 The diagram shows the exploded structure of the battery pack.

[0027] Figure 3 for Figure 1 The diagram shows a cross-sectional view of the battery pack along line III-III.

[0028] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle;

[0029] Figure 5 A schematic diagram of the structure of an electrical connector engaging with a through hole in a circuit board is provided for one embodiment of this application;

[0030] Figure 6 for Figure 2 The diagram shows the structural arrangement of the conductive busbar and the electrical connector.

[0031] Figure 7 for Figure 6 Front view of the connection between the central conductive bus and the electrical connector;

[0032] Figure 8 for Figure 7 A magnified view of a section at point B in the middle;

[0033] Figure 9 A schematic diagram of an energy storage device is provided for one embodiment of this application.

[0034] Explanation of key component symbols:

[0035] 100. Energy storage device; 10. Battery pack; 20. Housing; 11. Battery cell; 12. Conductor busbar; 13. Circuit board; 14. Electrical connector; 15. Insulating sheet; 131. First side; 132. Second side; 133. Through hole; 141. First connecting part; 142. Second connecting part; 143. Sealing part; 144. Deformation part; 1431. First elastic bending section; 1432. Second elastic bending section; 14311. First arc section; 14312. First branch section; 14313. Second branch section; 14321. Second arc section; 14322. Third branch section; 14323. Fourth branch section.

[0036] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0039] A battery pack typically consists of battery cells, aluminum busbars, and a circuit board. The aluminum busbars are welded to the terminals of the battery cells, and are electrically connected to the circuit board via nickel strips. Specifically, the nickel strips need to pass through through-holes in the circuit board before being soldered to it. However, during the assembly of the circuit board and the aluminum busbars, multiple nickel strips often need to be aligned simultaneously. Therefore, the through-holes on the circuit board are often quite large. This causes molten solder to easily drip through the through-holes during the soldering of the nickel strips, resulting in poor soldering between the nickel strips and the circuit board, thus affecting the battery pack's performance.

[0040] One embodiment of this application provides a battery pack. The battery pack includes a busbar, a circuit board, electrical connectors, and multiple battery cells. The busbar connects the terminals of at least two battery cells. The circuit board has a first side and a second side facing away from each other, with the busbar located on the first side. The circuit board has a through-hole extending through the first and second sides. The electrical connector includes a first connecting portion, a second connecting portion, and a sealing portion disposed between the first and second connecting portions. The first connecting portion is connected to the busbar, and the second connecting portion passes through the through-hole. The sealing portion is configured to press against the circuit board and cover the opening of the through-hole on the first side, so that molten solder poured into the through-hole can be sealed within the through-hole to connect the second connecting portion and the circuit board.

[0041] In the aforementioned battery pack, during the assembly of the circuit board and the busbar, the sealing portion of the electrical connector can press against the circuit board and cover the opening of the through-hole on the first side, thus sealing the molten solder poured into the through-hole within it. This reduces the risk of molten solder falling through the through-hole during soldering of the circuit board and the electrical connector, thereby reducing the risk of poor soldering between the electrical connector and the circuit board. Production and installation personnel can appropriately increase the size of the through-hole in the circuit board, thereby reducing the difficulty of aligning the circuit board with the electrical connector during assembly and improving the operability of circuit board installation.

[0042] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0043] Please refer to the following: Figure 1 and Figure 2 One embodiment of this application provides a battery pack 10. The battery pack 10 is configured to supply power to an electrical device, such as a television or computer. The battery pack 10 includes a busbar 12, a circuit board 13, electrical connectors 14, and a plurality of battery cells 11.

[0044] In some embodiments, the conductive bus 12 connects the terminals of at least two battery cells 11. The conductive bus 12 allows the current from multiple battery cells 11 to be collected. For example, there are two battery cells 11, and the conductive bus 12 connects the terminals of the two battery cells 11 to form a total positive and a total negative electrode.

[0045] In other embodiments, the number of battery cells 11 may also be three, four, five, or other quantities. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0046] In some embodiments, the circuit board 13 has a first side 131 and a second side 132 facing away from each other, the conductive bus 12 is located on the first side 131, and the circuit board 13 has a through hole 133 penetrating through the first side 131 and the second side 132. The through hole 133 facilitates the subsequent connection between the circuit board 13 and the electrical connector 14.

[0047] Please refer to the following: Figure 3 and Figure 4 In some embodiments, the electrical connector 14 includes a first connecting portion 141, a second connecting portion 142, and a sealing portion 143 disposed between the first connecting portion 141 and the second connecting portion 142. The first connecting portion 141 is connected to the conductive bus 12, and the second connecting portion 142 passes through the through hole 133.

[0048] The sealing part 143 is configured to press against the circuit board 13 and cover the opening of the through hole 133 on the first side 131 (not shown), so that the molten solder poured into the through hole 133 can be sealed in the through hole 133 to connect the second connection part 142 and the circuit board 13.

[0049] For example, when connecting the circuit board 13, the busbar 12, and the battery cell 11, the production and installation personnel first solder the first connecting part 141 of the electrical connector 14 to the busbar 12. After the first connecting part 141 is soldered, the production and installation personnel then align the through hole 133 in the circuit board 13 with the second connecting part 142, and pass the second connecting part 142 through the through hole 133.

[0050] When the second connecting part 142 passes through the through hole 133, the sealing part 143 presses against the circuit board 13 and covers the opening of the through hole 133 on the first side 131. Subsequently, the production and installation personnel solder the second connecting part 142 and the circuit board 13, and the solder liquid (specifically molten solder) poured into the through hole 133 is sealed inside the through hole 133. After the solder liquid solidifies, the connection between the second connecting part 142 and the circuit board 13 can be achieved.

[0051] It is worth noting that during the production and installation of the battery pack, the opening of the through hole on the first side is located at the bottom of the circuit board along the direction of gravity. However, when the battery pack is in use, the opening of the through hole on the first side is not necessarily located at the bottom of the circuit board along the direction of gravity.

[0052] By providing a sealing part 143 in the electrical connector 14, the risk of molten solder falling from the through hole 133 when the circuit board 13 and the conductive bus 12 are soldered together can be reduced, thereby reducing the risk of poor soldering between the electrical connector 14 and the circuit board 13.

[0053] Therefore, production and installation personnel can appropriately increase the size of the through hole 133 in the circuit board 13, thereby reducing the difficulty of aligning the circuit board 13 with the electrical connector 14 during assembly and improving the operability of the circuit board 13 installation.

[0054] In other embodiments, the first welding part and the conductive bus 12 can also be connected in other suitable ways, as long as the fixed connection and electrical connection between the conductive bus 12 and the electrical connector 14 can be achieved simultaneously. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0055] In some embodiments, the first connecting portion 141 is configured to be elastically deformable, and the sealing portion 143 is configured to hold the circuit board 13 under the elastic force of the first connecting portion 141.

[0056] Understandably, when the circuit board 13 is assembled with the conductive busbar 12, the first connecting part 141 undergoes elastic deformation and generates elastic force. Under the action of the elastic force of the first connecting part 141, the sealing part 143 tends to move towards the circuit board 13 and always keeps pressing the circuit board 13.

[0057] In some embodiments, the blocking portion 143 is configured to be elastically deformable, and the blocking portion 143 is able to hold the circuit board 13 under its own elastic force.

[0058] Understandably, when the circuit board 13 is assembled with the conductive busbar 12, the sealing part 143 undergoes elastic deformation and generates elastic force. Under the action of its own elastic force, the sealing part 143 tends to move towards the circuit board 13, and always keeps pressing the circuit board 13.

[0059] It should be noted that the sealing part 143 can always hold the circuit board 13 by means of elasticity. Firstly, it helps to ensure that the sealing part 143 always covers the opening of the through hole 133 on the first side 131. Secondly, it helps to reduce the risk that when the solder liquid is poured into the through hole 133, the impact force of the solder liquid is too large, which may cause the sealing part 143 and the circuit board 13 to form a gap, and the solder liquid may flow out from the through hole 133. This further reduces the risk of poor soldering between the electrical connector 14 and the circuit board 13.

[0060] Please refer to the following: Figures 4 to 7 In some embodiments, the blocking portion 143 includes a first elastic bending segment 1431 and a second elastic bending segment 1432 connected to each other, the bending directions of the first elastic bending segment 1431 and the second elastic bending segment 1432 being opposite.

[0061] In some embodiments, the first elastic bending segment 1431 is connected to the first connecting portion 141, and the second elastic bending segment 1432 is connected to the second connecting portion 142. Both the first elastic bending segment 1431 and the second elastic bending segment 1432 are pressed against the circuit board 13 and together cover the opening of the through hole 133 on the first side 131.

[0062] Specifically, when the circuit board 13 is assembled with the conductive busbar 12, the second connecting portion 142 passes through the through hole 133. The circuit board 13 simultaneously compresses the first elastic bending segment 1431 and the second elastic bending segment 1432. The first elastic bending segment 1431 and the second elastic bending segment 1432 undergo elastic deformation under force and generate elastic force. Under the action of elastic force, the first elastic bending segment 1431 and the second elastic bending segment 1432 tend to move towards the circuit board 13, and together they press against the circuit board 13 and cover the opening of the through hole 133 on the first side 131.

[0063] The sealing part 143, through its own structure (specifically, the first elastic bending section 1431 and the second elastic bending section 1432), can press against the circuit board 13 and cover the opening of the through hole 133 on the first side. Production and installation personnel do not need to make structural changes to the first connecting part 141, which helps to ensure the structural strength of the first connecting part 141 and extend its service life.

[0064] In other embodiments, the first elastic bending segment 1431 may also be connected to the second connecting portion 142, and the second elastic bending segment 1432 may also be connected to the first connecting portion 141. Alternatively, please refer to... Figure 5 The first elastic bending segment 1431 is connected to both the first connecting part 141 and the second connecting part 142, and the second elastic bending segment 1432 is connected to both the first connecting part 141 and the second connecting part 142. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0065] Please see Figure 8 For example, the first elastic bending segment 1431 and the second elastic bending segment 1432 together form a "Z"-shaped sealing portion 143. The first elastic bending segment 1431 includes a first arc segment 14311 and a first branch segment 14312 and a second branch segment 14313 disposed at both ends of the first arc segment 14311. The second elastic bending segment 1432 includes a second arc segment 14321 and a third branch segment 14322 and a fourth branch segment 14323 disposed at both ends of the second arc segment 14321.

[0066] The opening orientation of the first arc segment 14311 is opposite to that of the second arc segment 14321. The first branch segment 14312 is connected to the first connecting part 141, the second branch segment 14313 is connected to the third branch segment 14322, and the fourth branch segment 14323 is connected to the second connecting part 142. The second branch segment 14313 and the fourth branch segment 14323 are both pressed onto the circuit board 13 and, together with the third branch segment 14322, cover the opening of the through hole 133 on the first side.

[0067] It should be noted that the second segment 14313 and the third segment 14322 can be a single integrated structure or two independent segments. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0068] Both the first elastic bending segment 1431 and the second elastic bending segment 1432 adopt a structure of "arc segment + two support segments". The arc segment (specifically the first arc segment 14311 and the second arc segment 14321) can not only provide a uniform stress distribution and reduce the risk of fatigue fracture of the first elastic bending segment 1431 and the second elastic bending segment 1432, but also increase the deformation range of the corresponding elastic bending segment (specifically the first elastic bending segment 1431 and the second elastic bending segment 1432), thereby improving the elastic force and ensuring that the first elastic bending segment 1431 and the second elastic bending segment 1432 hold the circuit board 13.

[0069] Please see Figure 7 In some embodiments, before the electrical connector 14 is pressed onto the circuit board 13, along the through-path of the second connection portion 142, the sum of the distance between the first branch segment 14312 and the second branch segment 14313 and the distance between the third branch segment 14321 and the fourth branch segment 14322 is D1, where D1 = 0.8 mm - 1.2 mm.

[0070] Therefore, sufficient elastic deformation space can be reserved between the first elastic bending section 1431 and the second elastic bending section 1432 to provide sufficient elastic force, thereby ensuring that the first elastic bending section 1431 and the second elastic bending section 1432 can keep pressing the circuit board 13.

[0071] Secondly, it can absorb the assembly errors generated during the assembly of the circuit board 13 and the conductive busbar 12, thereby better ensuring that the sealing part 143 always presses the circuit board 13 and covers the opening of the through hole 133 on the first side 131.

[0072] For example, the sum of the distance between the first segment 14312 and the second segment 14313 and the distance between the third segment 14321 and the fourth segment 14322 is 1 mm.

[0073] In other embodiments, the sum of the distance between the first branch 14312 and the second branch 14313 and the distance between the third branch 14321 and the fourth branch 14322 may also be 0.9mm, 1.1mm, etc. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0074] Please refer to the following: Figure 4 and Figure 6 In some embodiments, the electrical connector 14 further includes a deformation portion 144, one end of which is connected to the first connection portion 141 and the other end of which is connected to the sealing portion 143. The deformation portion 144 has an arc-shaped structure and is configured to deform when the cell 11 expands or vibrates to absorb the displacement difference between the first connection portion 141 and the sealing portion 143.

[0075] By providing the deformation part 144, the rigid connection between the first connecting part 141 and the sealing part 143 can be transformed into a flexible connection, which helps to reduce the risk of electrical connector 14 breaking due to stress concentration between the first connecting part 141 and the sealing part 143, and extends the service life of electrical connector 14.

[0076] For example, the deformation portion 144 is U-shaped, and its two ends are connected to the first connecting portion 141 and the sealing portion 143, respectively. When the battery cell 11 expands or vibrates, the two side walls of the U-shaped deformation portion 144 can move towards its central space to absorb the displacement difference between the first connecting portion 141 and the sealing portion 143.

[0077] In other embodiments, the deformable portion 144 may also be in other shapes, such as wavy or serrated. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0078] Please see Figure 4 In some embodiments, along the penetration direction perpendicular to the second connection 142, the width of the blocking part 143 is D1, and the width of the through hole 133 is D2, where D1 > D2.

[0079] By limiting the width of the sealing portion 143 to be greater than the width of the through hole 133, it is beneficial to ensure that the sealing portion 143 can completely cover the opening of the through hole 133 on the first side 131, thereby better reducing the risk of molten solder falling from the through hole 133.

[0080] For example, if the width of the through hole 133 is 2mm along the direction perpendicular to the second connecting portion 142, then the width of the sealing portion 143 is 3mm. When the second connecting portion 142 passes through the through hole 133 and the sealing portion 143 is pressed against the circuit board 13, the sealing portion 143 can completely cover the opening of the through hole 133 on the first side 131.

[0081] In some embodiments, a portion of the second connecting portion 142 extends out of the through hole 133 and is exposed on the circuit board 13. By extending the second connecting portion 142 out of the through hole 133 and exposing it on the circuit board 13, production and installation personnel do not need to solder within the narrow through hole 133. They can solder the circuit board 13 and the electrical connector 14 (specifically the second connecting portion 142) in a larger operating space outside the circuit board 13, which greatly improves the convenience of operation for production and installation personnel.

[0082] Please continue reading. Figure 4 In some embodiments, the height of the second connection portion 142 exposed above the circuit board 13 along the penetration direction of the second connection portion 142 is greater than 3mm.

[0083] By limiting the height of the second connection portion 142 exposed above the circuit board 13 to be greater than 3mm, the soldering space of the circuit board 13 and the second connection portion 142 (specifically, the space for molten solder to solidify) can be increased, thereby improving the reliability of the soldering between the electrical connector 14 and the circuit board 13.

[0084] For example, along the penetration direction of the second connecting portion 142, the height of the second connecting portion 142 exposed above the circuit board 13 is 5mm. When the production and installation personnel solder the circuit board 13 to the electrical connector 14, molten solder is poured into the through hole 133 and covers the portion of the second connecting portion 142 exposed above the circuit board 13. After the molten solder solidifies, the connection between the circuit board 13 and the electrical connector 14 is achieved.

[0085] In other embodiments, the height of the second connection portion 142 exposed above the circuit board 13 may also be 6mm, 7mm, etc. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0086] In some embodiments, the electrical connector 14 is configured as an integrally formed structure, which can not only reduce the processing steps of the electrical connector 14 and improve assembly efficiency, but also increase the structural strength of the electrical connector 14 and extend its service life.

[0087] For example, the electrical connector 14 is a nickel sheet. After the nickel sheet is bent multiple times by a bending machine, it forms a first connecting part 141, a deformable part 144, a sealing part 143, and a second connecting part 142.

[0088] In other embodiments, the electrical connector 14 may also be integrally formed by casting or other methods. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0089] Please refer to the following: Figure 3 and Figure 4 In some embodiments, the battery pack 10 further includes an insulating sheet 15, which is mounted on the circuit board 13 and located on the first side 131. A second connecting portion 142 passes through the insulating sheet 15 and a through hole 133, and a sealing portion 143 presses against the insulating sheet 15, thereby pressing the insulating sheet 15 against the circuit board 13. The insulating sheet 15 helps reduce the risk of short circuits in the circuit board 13, thus protecting the circuit board 13.

[0090] Please see Figure 9 One embodiment of this application provides an energy storage device 100. The energy storage device 100 has the functions of storing and discharging electricity for use as backup power for homes, production facilities, outdoor work, and outdoor recreation. The energy storage device 100 includes a housing 20 and the aforementioned battery pack 10, with the battery pack 10 installed within the housing 20.

[0091] By using the battery pack 10 described above, when the circuit board 13 is assembled with the conductive busbar 12, the sealing part 143 in the electrical connector 14 can press against the circuit board 13 and cover the opening of the through hole 133 on the first side 131, so that the molten solder injected into the through hole 133 can be sealed in the through hole 133.

[0092] This reduces the risk of molten solder falling through the through-hole 133 when the circuit board 13 and the electrical connector 14 are soldered together, thereby reducing the risk of poor soldering between the electrical connector 14 and the circuit board 13. Production and installation personnel can appropriately increase the size of the through-hole 133 in the circuit board 13, thereby reducing the difficulty of aligning the circuit board 13 with the electrical connector 14 during assembly and improving the operability of the circuit board 13 installation.

[0093] In some embodiments, the energy storage device 100 includes a power conversion module (not shown). The power conversion module is housed within a housing 20. The housing 20 protects the power conversion module. The power conversion module is electrically connected to the battery pack 10. The power conversion module is used to control the AC / DC conversion of the output current of the battery pack 10. The energy storage device 100 equipped with the power conversion module can be a small portable power source, a residential energy storage power source, an industrial or commercial energy storage power source, or a containerized energy storage power source, etc.

[0094] In some embodiments, the power conversion module may be omitted. An energy storage device 100 without a power conversion module can be used independently. An energy storage device 100 without a power conversion module typically only outputs DC power. When used independently, an energy storage device 100 without a power conversion module can be used in conjunction with an energy storage device 100 with a power conversion module as a power system providing additional battery capacity.

[0095] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. A battery pack, characterized in that, include: Multiple battery cells; A conductive busbar, connecting the terminals of at least two of the battery cells; A circuit board has a first side and a second side facing away from each other, the conductive bus is located on the first side, and the circuit board has a through hole penetrating the first side and the second side; An electrical connector includes a first connecting portion, a second connecting portion, and a sealing portion disposed between the first connecting portion and the second connecting portion. The first connecting portion is connected to the conductive busbar, the second connecting portion passes through the through hole, and the sealing portion is configured to press against the circuit board and cover the opening of the through hole on the first side, so that the molten solder poured into the through hole can be sealed in the through hole to connect the second connecting portion and the circuit board.

2. The battery pack according to claim 1, characterized in that, The first connecting portion is configured to be elastically deformable, and the sealing portion is configured to hold the circuit board under the elastic force of the first connecting portion; Alternatively, the sealing portion is configured to be elastically deformable, and the sealing portion can hold the circuit board under its own elastic force.

3. The battery pack according to claim 2, characterized in that, The sealing portion includes a first elastic bending segment and a second elastic bending segment connected to each other. The bending directions of the first elastic bending segment and the second elastic bending segment are opposite. The first elastic bending segment is connected to the first connecting portion and / or the second connecting portion, and the second elastic bending segment is connected to the first connecting portion and / or the second connecting portion. Both the first elastic bending segment and the second elastic bending segment are pressed against the circuit board and together cover the opening of the through hole on the first side.

4. The battery pack according to claim 3, characterized in that, The first elastic bending segment includes a first arc segment and a first branch segment and a second branch segment connected to both ends of the first arc segment; the second elastic bending segment includes a second arc segment and a third branch segment and a fourth branch segment connected to both ends of the second arc segment. The opening orientation of the first arc segment is opposite to that of the second arc segment. The first branch segment is connected to the first connecting part, the second branch segment is connected to the third branch segment, and the fourth branch segment is connected to the second connecting part. The second branch segment and the fourth branch segment are both pressed onto the circuit board and together with the third branch segment, they cover the opening of the through hole on the first side.

5. The battery pack according to claim 4, characterized in that, Before the electrical connector is pressed onto the circuit board, along the penetration direction of the second connection portion, the sum of the distance between the first and second branches and the distance between the third and fourth branches is D1, where D1 = 0.8 mm - 1.2 mm.

6. The battery pack according to any one of claims 1 to 5, characterized in that, The electrical connector further includes a deformable part, one end of which is connected to the first connecting part, and the other end of which is connected to the sealing part; The deformation section has an arc-shaped structure and is configured to deform when the battery cell expands or vibrates, so as to absorb the displacement difference between the first connection section and the sealing section.

7. The battery pack according to any one of claims 1 to 5, characterized in that, A portion of the second connecting part extends out of the through hole and is exposed on the circuit board.

8. The battery pack according to claim 7, characterized in that, Along the insertion direction of the second connecting part, the height of the second connecting part exposed above the circuit board is greater than 3mm.

9. The battery pack according to any one of claims 1 to 5, characterized in that, The electrical connector is configured as a one-piece molded structure.

10. The battery pack according to claim 1, characterized in that, The battery pack also includes an insulating sheet, which is mounted on the circuit board and located on the first side; the second connecting portion passes through the insulating sheet and the through hole, and the sealing portion presses against the insulating sheet so that the insulating sheet is pressed against the circuit board.

11. An energy storage device, characterized in that, It includes a housing and a battery pack as claimed in any one of claims 1 to 10, wherein the battery pack is installed within the housing.

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