Power battery box and electric surfboard

Abstract

The utility model relates to the technical field of electrical equipment, in particular to a power battery box and an electric surfboard, the power battery box comprises a sealing shell, a battery cell module and two discharging mechanisms, the battery cell module comprises a plurality of aluminum shell battery cells and an over-current aluminum row, the over-current aluminum row is configured to be connected in series with the aluminum shell battery cells, and the two discharging mechanisms are arranged on the sealing shell. The aluminum shell battery cells are arranged in the sealed shell, so that the aluminum shell battery cells form a battery cell group, the battery cell group is arranged in the sealed shell, shells of the aluminum shell battery cells are square shells, the overcurrent aluminum row covers electrodes of the aluminum shell battery cells and forms positive and negative electrodes of the battery cell module, one end of each discharging mechanism is connected with the positive electrode or the negative electrode of the battery cell module, and the other end of each discharging mechanism is fixed on the sealed shell; and the connector is used for connecting electric equipment. The utility model mainly aims to provide a power battery box which aims to increase current and stably realize high-power over-current on the premise of not changing the volume of a shell, so that the power performance and the safety performance of the power battery box are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a power battery box and an electric surfboard. Background Art

[0002] Electric surfboards are an emerging type of water sports equipment that combine the passion of surfing with the convenience of modern technology, allowing surfers to experience the joy of surfing even when there are no waves. These devices typically consist of a streamlined board and one or more electric propulsion systems, allowing users to move and maneuver quickly across the water.

[0003] An electric surfboard primarily consists of key components: the board, battery pack, motor, and control system. The board, the main body of the surfboard, is designed to glide across the water and typically houses the battery pack. The battery pack provides the necessary electrical energy for the entire system, while the motor converts this energy into propulsion, propelling the surfboard across the water. The control system manages the motor and battery pack to achieve various speeds and riding modes. The interplay of these components is crucial, ensuring the performance and safety of the electric surfboard.

[0004] However, electric surfboard battery packs, particularly those using ternary 18650 cylindrical cells, face challenges such as complex structure, difficult assembly, and numerous process issues. At high power output, the thin current collectors within these battery packs may struggle to withstand the high current discharge, leading to excessive temperature rise. Excessive temperatures not only affect cell performance but can also cause excessive temperature rise in the cell and battery pack, compromising battery stability and safety. Utility Model Content

[0005] The main purpose of the utility model is to propose a power battery box, which aims to increase the current and stably achieve high-power current flow without changing the volume of the shell, thereby improving the power performance and safety performance of the power battery box.

[0006] To achieve the above objectives, the power battery box proposed in the present invention includes:

[0007] Sealed housing;

[0008] A battery cell module, wherein the battery cell module includes a number of aluminum shell battery cells and an overcurrent aluminum busbar, wherein the overcurrent aluminum busbar is configured to connect the aluminum shell battery cells in series so that the aluminum shell battery cells form a battery cell group, so that the battery cell group is arranged in the sealed housing, wherein the housing of the aluminum shell battery cell is a square housing, and the overcurrent aluminum busbar covers the electrodes of the aluminum shell battery cell and forms the positive and negative electrodes of the battery cell module; and

[0009] Two discharge mechanisms, one end of each discharge mechanism is connected to the positive electrode or the negative electrode of the battery module, and the other end is fixed to the sealed shell and is used to connect to the electrical equipment.

[0010] In one embodiment of the present invention, the aluminum shell battery core forms two battery core groups, the two battery core groups are spaced apart and form a limited space with the sealed shell, and the two discharge mechanisms are located in the limited space.

[0011] In one embodiment of the present utility model, the discharge mechanism includes a discharge female connector and a discharge male connector, the discharge female connector is electrically connected to the positive pole or negative pole of the battery cell module, one end of the discharge male connector is plugged into the discharge female connector, and the other end is fixed to the sealed shell.

[0012] In one embodiment of the present invention, the discharge mechanism further includes a current-sharing connector, which is provided in the plug hole of the discharge female connector. The outer side of the current-sharing connector abuts against the inner wall of the plug hole, and the inner side abuts against the outer wall of the discharge male connector.

[0013] In one embodiment of the present invention, outer surfaces of the discharge female connector and the discharge male connector are both provided with a conductive plating layer.

[0014] In one embodiment of the present invention, the discharge mechanism further includes an insulating sleeve, which is sleeved on the outer circumference of the discharge female connector and the discharge male connector.

[0015] In one embodiment of the present invention, an electrical isolation layer is provided between the battery cell module and the sealed housing.

[0016] In one embodiment of the present invention, a sealing space is provided between the battery cell module and the sealed housing, and the sealing space is filled with liquid silicone, which forms the electrical isolation layer.

[0017] In one embodiment of the present invention, the power battery box further includes a battery management system, which is attached to one of the battery cell groups and electrically connected to the positive and negative electrodes of the battery cell modules.

[0018] The utility model also provides an electric surfboard, which includes the power battery box.

[0019] In the technical solution of the present invention, the power battery box adopts square aluminum shell battery cells and uses large-area overcurrent aluminum bars to connect the battery cells in series. In this way, the square aluminum shell battery cells can reduce the gap between them and the sealed shell compared to round batteries, so that more battery cells can be placed under the sealed shell of the same volume, thereby providing a larger current for the electric surfboard; in order to ensure that the power battery box can carry a larger current, the overcurrent aluminum bar completely covers the electrodes of the aluminum shell battery cells, which not only ensures the safety of high-rate current discharge, but also prevents the temperature rise of the battery cell poles from being too fast; at the same time, in order to ensure the discharge safety of the power battery box, two discharge mechanisms are fixed and hidden inside the sealed shell, and the output end of the discharge mechanism is fixed to the sealed shell by bolts or the like, and the wire terminal on the power connection wire of the electrical equipment is arranged between the bolts and the output end of the discharge mechanism, thereby reducing the risk of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the power battery box provided by the utility model;

[0022] Figure 2 For the Figure 1 Cross-sectional view along line AA;

[0023] Figure 3 A schematic diagram of the internal structure of the power battery box provided by the utility model;

[0024] Figure 4 A schematic diagram of the structure of the discharge mechanism provided by the utility model;

[0025] Figure 5 for Figure 4 Structural explosion diagram;

[0026] Figure 6 For the Figure 4 Cross-sectional view along the midline BB;

[0027] Figure 7 This is a partial structural diagram of the power battery box provided by the utility model.

[0028] Description of Figure Numbers:

[0029] 10. Sealed shell; 20. Battery cell module; 201. Aluminum shell battery cell; 202. Overcurrent aluminum busbar; 30. Discharge mechanism; 301. Discharge female connector; 302. Discharge male connector; 303. Current-sharing connector; 304. Insulation sleeve; 40. Electrical isolation layer.

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] The power battery box proposed by the utility model includes:

[0035] Sealing housing 10;

[0036] The battery cell module 20 includes a plurality of aluminum-shell battery cells 201 and aluminum overcurrent busbars 202. The aluminum overcurrent busbars 202 are configured to connect the aluminum-shell battery cells 201 in series so that the aluminum-shell battery cells 201 form a battery cell group. The battery cell group is provided in the sealed housing 10. The housing of the aluminum-shell battery cells 201 is a square housing. The aluminum overcurrent busbars 202 cover the electrodes of the aluminum-shell battery cells 201 and form the positive and negative electrodes of the battery cell module 20.

[0037] There are two discharge mechanisms 30 , one end of each discharge mechanism 30 is connected to the positive electrode or the negative electrode of the battery module 20 , and the other end is fixed to the sealed housing 10 and is used to connect to an electrical device.

[0038] In the technical solution of the present invention, the power battery box adopts square aluminum shell battery cells 201 and uses large-area overcurrent aluminum bars 202 to connect the battery cells in series. In this way, the square aluminum shell battery cells 201 can reduce the gap between them and the sealed shell 10 compared with round batteries, so that more battery cells can be placed under the sealed shell 10 of the same volume, thereby providing a larger current for the electric surfboard; in order to ensure that the power battery box can carry a larger current, the overcurrent aluminum bars 202 completely cover the electrodes of the aluminum shell battery cells 201, which not only ensures the safety of high-rate current discharge, but also prevents the temperature rise of the battery cell poles from being too fast; at the same time, in order to ensure the discharge safety of the power battery box, two discharge mechanisms 30 are fixed and hidden inside the sealed shell 10, and the output end of the discharge mechanism 30 is fixed to the sealed shell 10 by bolts or the like. The wire terminal on the power lead of the electrical equipment is arranged between the bolts and the output end of the discharge mechanism 30, thereby reducing the risk of leakage.

[0039] The power battery box is fixed inside the board body of the electric surfboard and provides power to the electrical equipment of the electric surfboard, such as the motor, display module, lighting module and other equipment. Among them, the sealed shell 10 directly or indirectly provides an installation base for all circuit equipment of the battery box, so that each circuit equipment can remain fixed relative to the sealed shell 10.

[0040] The cell module 20 is the power source for the entire power battery pack. In one embodiment, the cell module 20 includes 18 55Ah square aluminum-shelled cells 201. Connected in series with aluminum busbars 202, they achieve a voltage and capacity specification of 65.7V, 55Ah, and 3.61KWh (kilowatt-hours of electricity). The aluminum busbars 202 are laser-welded to the positive and negative electrodes of the battery. Each busbar 202 has a minimum thickness (height) of 2mm, and widths of 18mm, 21mm, and 22mm, respectively. The flow area ranges from 30 to 50mm². Under these conditions, the power battery pack can stably and continuously output a current exceeding four times the rated current, meeting the starting and acceleration requirements of electric surfboards of any specification from 10 to 15kW, while also maintaining power continuity during high-speed, tight-radius cornering. According to actual test results, a small surfboard with a 10KW engine can reach a maximum speed of 72KM / h, with a 0-4 second acceleration of approximately 40KM / h. A large surfboard with a 15KW engine can reach a maximum speed of 55KM / h, with a 0-4 second acceleration of approximately 30KM / h. This far exceeds the maximum speed of 45KM / h for cylindrical cell battery packs and 60KM / h for soft pack battery packs. For further information, please refer to Figure 1 A movable magnet is provided on one surface of the sealed shell 10, and a magnet switch is provided on the battery core module 20. The magnet switch is hidden in the sealed shell 10. When the power battery box needs to be opened for power supply, the magnet moves to the surface of the sealed shell 10 to align with the magnet switch, thereby enabling the power battery box to be powered on.

[0041] Furthermore, the aluminum shell battery cell 201 forms two battery cell groups, the two battery cell groups are spaced apart and form a limited space with the sealed shell 10, and the two discharge mechanisms 30 are located in the limited space. In this way, the installation and fixation of the discharge mechanism 30 can be facilitated, and an insulating structure (epoxy board or polyester board, etc.) can be provided around each battery cell group.

[0042] In one embodiment of the present invention, the discharge mechanism 30 includes a discharge female connector 301 and a discharge male connector 302. The discharge female connector 301 is electrically connected to the positive or negative electrode of the battery module 20. One end of the discharge male connector 302 is plugged into the discharge female connector 301, and the other end is fixed to the sealed housing 10. For details, please refer to Figure 3In order to facilitate the explanation of the current flow of the power battery box, two battery cell groups are defined herein as the first battery group and the second battery group. The first battery group and the second battery group both include 9 aluminum shell battery cells 201, wherein the first battery group forms two electrodes (positive and negative), and the second battery group forms two electrodes (positive and negative). A positive electrode of the first electrode group is connected to a negative electrode of the second electrode group through an overcurrent aluminum bus 202, and a positive electrode of the first electrode group is connected to an overcurrent aluminum bus 202 to form the total positive electrode of the battery module 20. A discharge female connector 301 is connected to this total positive electrode. Similarly, a negative electrode of the second electrode group is connected to an overcurrent aluminum bus 202 to form the total negative electrode of the battery module 20, and a discharge female connector 301 is connected to this total negative electrode. Each discharge male connector 302 is plugged into a discharge female connector 301, thereby forming the positive and negative poles of the power battery box. The electrical equipment is connected to the positive and negative poles of the power battery box through wires to form the circuit of the electric surfboard. Among them, the two discharge mechanisms 30 are fixed and hidden inside the sealed shell 10, and the output end of the discharge mechanism 30 is fixed to the sealed shell 10 by bolts or the like, thereby reducing the risk of leakage.

[0043] Further, see Figures 4 to 6 The discharge mechanism 30 also includes a current-sharing connector 303, which is located in the insertion hole of the discharge female connector 301. The outer side of the current-sharing connector 303 abuts the inner wall of the insertion hole, and the inner side abuts the outer wall of the discharge male connector 302. This connection function of the current-sharing connector 303 prevents electrical gaps between the discharge female connector 301 and the discharge male connector 302, which could lead to circuit instability. Furthermore, during the insertion of the discharge male connector 302 into the discharge female connector 301, the current-sharing connector 303 prevents axial deviation between the two connectors. It is understood that the current-sharing connector 303 can be a crown spring or a wave spring, and this is not limited here.

[0044] In one embodiment of the present invention, the outer surfaces of the discharge female connector 301 and the discharge male connector 302 are both provided with a conductive plating layer, thereby improving the conductivity, corrosion resistance and wear resistance of the discharge mechanism 30, wherein the material of the conductive plating layer can be copper, nickel or the like.

[0045] In one embodiment of the present invention, please refer to Figure 2 The discharge mechanism 30 further includes an insulating sleeve 304, which is sleeved on the outer circumference of the discharge female connector 301 and the discharge male connector 302. By adding the insulating sleeve 304, the waterproofness of the discharge female connector 301 and the discharge male connector 302 can be improved.

[0046] In one embodiment of the present invention, an electrical isolation layer 40 is provided between the battery cell module 20 and the sealed shell 10. In this way, the battery cell module 20 is sealed in the sealed shell 10, effectively preventing the battery cell module 20 from contacting the conductive medium (water), avoiding short circuit of the battery cell module 20, thereby improving the power performance and safety performance of the power battery box.

[0047] Further, see Figure 7 There is a sealing space between the battery cell module 20 and the sealed shell 10, and the sealing space is filled with liquid silicone. The liquid silicone forms an electrical isolation layer 40. Specifically, before the sealed shell 10 of the power battery box is packaged, liquid silicone is poured into the sealing space between the sealed shell 10 and the battery cell module 20. The liquid silicone can cover the circuit inside the sealed shell 10 and cover the battery cell module 20. Then after a certain period of time, the liquid silicone solidifies to form an electrical isolation layer 40. By pouring liquid silicone, the insulation and thermal conductivity of the power battery box are effectively improved. Moreover, after pouring liquid silicone, the gas inside the sealed shell 10 is discharged or only a small amount of air is left. In this way, even if the battery cell module 20 accidentally burns, it will automatically extinguish in a very short time due to lack of combustion aid (oxygen in the air), thereby ensuring the safety performance of the power battery box and preventing explosion problems.

[0048] In one embodiment of the present invention, the power battery box further includes a battery management system module. Specifically, the battery management system is disposed between the two battery cell groups and attached to one battery cell group. Figure 3 An electrode connected to the battery cell group leads to the positive or negative electrode through the overcurrent aluminum bus 202, one end of a wire is connected to this electrode, and the other end is connected to the battery management system main board, and then a discharge female connector 301 is connected to the battery management system main board through the overcurrent aluminum bus 202, thereby completing the circuit direction.

[0049] The present invention further provides an electric surfboard, comprising a power battery box, a board body, and electrical equipment. The power battery box is disposed within the board body, and wiring associated with the electrical equipment and the power battery box is concealed within the board body. The specific structure of the power battery box is similar to that of the above-described embodiments. Since the electric surfboard provided by the present invention adopts all the technical solutions of all the above-described embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-described embodiments, which will not be described in detail here.

[0050] The above are merely exemplary embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A power battery box, used for an electric surfboard, characterized in that: The power battery box includes: Sealed housing; A battery cell module, wherein the battery cell module includes a number of aluminum shell battery cells and an overcurrent aluminum busbar, wherein the overcurrent aluminum busbar is configured to connect the aluminum shell battery cells in series so that the aluminum shell battery cells form a battery cell group, so that the battery cell group is arranged in the sealed housing, wherein the housing of the aluminum shell battery cell is a square housing, and the overcurrent aluminum busbar covers the electrodes of the aluminum shell battery cell and forms the positive and negative electrodes of the battery cell module; and Two discharge mechanisms, one end of each discharge mechanism is connected to the positive electrode or the negative electrode of the battery module, and the other end is fixed to the sealed shell and is used to connect to the electrical equipment.

2. The power battery box according to claim 1, characterized in that: Each of the aluminum shell battery cells forms two battery cell groups, the two battery cell groups are spaced apart and form a limited space with the sealed shell, and the two discharge mechanisms are located in the limited space.

3. The power battery box according to claim 1, characterized in that: The discharge mechanism includes a discharge female connector and a discharge male connector. The discharge female connector is electrically connected to the positive or negative pole of the battery module. One end of the discharge male connector is plugged into the discharge female connector, and the other end is fixed to the sealed housing.

4. The power battery box according to claim 3, characterized in that: The discharge mechanism further includes a current-sharing connector, which is provided in the plug hole of the discharge female connector. The outer side of the current-sharing connector abuts against the inner peripheral wall of the plug hole, and the inner side abuts against the outer peripheral wall of the discharge male connector.

5. The power battery box according to claim 4, characterized in that: The outer surfaces of the discharge female connector and the discharge male connector are both provided with a conductive plating layer.

6. The power battery box according to claim 5, characterized in that: The discharge mechanism further includes an insulating sleeve, which is sleeved on the outer circumference of the discharge female connector and the discharge male connector.

7. The power battery box according to any one of claims 1 to 6, characterized in that: An electrical isolation layer is provided between the battery core module and the sealed housing.

8. The power battery box according to claim 7, characterized in that: A sealing space is defined between the battery cell module and the sealed housing. The sealing space is filled with liquid silicone, and the liquid silicone forms the electrical isolation layer.

9. The power battery box according to any one of claims 1 to 6, characterized in that: The power battery box further includes a battery management system, which is attached to one of the battery cell groups and electrically connected to the positive and negative electrodes of the battery cell modules.

10. An electric surfboard, characterized in that: The electric surfboard includes the power battery box according to any one of claims 1 to 9.

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