A battery pack

Abstract

The embodiments of the present application relate to the field of energy storage technologies, and in particular, to a battery pack. The battery pack includes a bottom plate, an upper cover, a BMS board, a first battery cell, a second battery cell, a first current-carrying busbar, a second current-carrying busbar, and a third current-carrying busbar; the upper cover is detachably connected to the bottom plate; a receiving cavity is formed between the upper cover and the bottom plate, and the first battery cell and the second battery cell are received in the receiving cavity; the BMS board is disposed on the upper cover; a positive terminal and a negative terminal are disposed on the BMS board, the positive terminal is electrically connected to the second current-carrying busbar, and the negative terminal is electrically connected to the first current-carrying busbar; the first current-carrying busbar is electrically connected to the negative electrode of the first battery cell, the second current-carrying busbar is electrically connected to the positive electrode of the second battery cell, and the positive electrode of the first battery cell and the negative electrode of the second battery cell are electrically connected through the third current-carrying busbar. The battery pack includes the first battery cell and the second battery cell. Compared with the situation where the battery pack in the prior art includes one battery cell, the volume energy density of the battery pack in the present application is increased.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of energy storage, and in particular, to a battery pack. Background Art

[0002] A battery pack is a device that converts external energy into electrical energy and stores it, and can supply power to external electrical devices (such as portable energy storage devices) when needed. It is widely used in daily life, providing great convenience and richness for people's daily life. A traditional battery pack includes a BMS (Battery Management System) board and battery cells. The battery cells are electrically connected to the BMS board, and the BMS board is used to control the charging and discharging of the battery cells.

[0003] With the continuous development of the energy storage industry, the demand for the capacity of the battery pack within a certain accommodation space is increasing continuously. Summary of the Invention

[0004] In view of the above problems, the embodiments of the present application provide a battery pack, which overcomes the above problems or at least partially solves the above problems.

[0005] According to an aspect of the embodiments of the present application, there is provided a battery pack, including a bottom plate, an upper cover, a first battery cell, a second battery cell, a first current-carrying busbar, a second current-carrying busbar, and a third current-carrying busbar; the upper cover is detachably and electrically connected to the bottom plate; an accommodation cavity is formed between the upper cover and the bottom plate, and the first battery cell and the second battery cell are received in the accommodation cavity; the BMS board is disposed on the upper cover; a positive terminal and a negative terminal are disposed on the BMS board, the positive terminal is electrically connected to the second current-carrying busbar, and the negative terminal is electrically connected to the first current-carrying busbar; the first current-carrying busbar is electrically connected to the negative electrode of the first battery cell, the second current-carrying busbar is electrically connected to the positive electrode of the second battery cell, and the positive electrode of the first battery cell and the negative electrode of the second battery cell are electrically connected through the third current-carrying busbar.

[0006] In an optional manner, the battery pack further includes at least one third battery cell, and the number of the third current-carrying busbars is at least two; the positive electrode of the first battery cell, at least one third battery cell, and the negative electrode of the second battery cell are connected in series through the third current-carrying busbar.

[0007] In an alternative embodiment, the upper cover includes a first folding plate, a first side plate, an upper plate, a second side plate, and a second folding plate that are sequentially connected; the first side plate and the second side plate are disposed opposite to each other, and an accommodation cavity is formed between the first side plate, the upper plate, the second side plate, and the bottom plate; the first folding plate is connected to a side of the first side plate away from the upper plate, and the first folding plate is bent relative to the first side plate; the second folding plate is connected to a side of the second side plate away from the upper plate, and the second folding plate is bent relative to the second side plate; the first folding plate is detachably connected to the bottom plate, and the second folding plate is detachably connected to the bottom plate.

[0008] In an alternative embodiment, the battery pack further includes a plurality of first press rivet screws distributed on the bottom plate; the upper cover is provided with a plurality of first through holes distributed on the first folding plate and the second folding plate; the number of the first press rivet screws is the same as the number of the first through holes, and one first press rivet screw corresponds to one first through hole.

[0009] In an alternative embodiment, the BMS board is disposed on the first side plate.

[0010] In an alternative embodiment, the BMS board is further connected with a fourth current bus bar and a fifth current bus bar; the fourth current bus bar is electrically connected to the positive terminal, and the fifth current bus bar is electrically connected to the negative terminal; both ends of the fourth current bus bar are electrically connected with a male terminal and a female terminal respectively; both ends of the fifth current bus bar are electrically connected with the male terminal and the female terminal respectively; when two adjacent battery packs are connected in parallel, the male terminal of one battery pack is used to dock with the female terminal of the other battery pack.

[0011] In an alternative embodiment, a parallel connection positive terminal and a parallel connection negative terminal are further disposed on the BMS board, the parallel connection positive terminal is electrically connected to the fourth current bus bar, and the parallel connection negative terminal is electrically connected to the fifth current bus bar.

[0012] In an alternative embodiment, the battery pack further includes a housing having a first side surface, an upper plate body, a second side surface, and a lower plate body that are sequentially connected, the lower plate body is connected to the first side surface, and the upper plate body and the lower plate body are disposed opposite to each other; the female terminal is disposed on the upper plate body; the lower plate body is recessed in a direction away from the upper plate body to form a mounting groove, and the male terminal is located in the mounting groove; a mounting hole is formed at the bottom of the mounting groove.

[0013] In an alternative embodiment, the battery pack further includes a protective door covering the mounting hole. The protective door is rotatably connected to the lower plate body. When two adjacent battery packs are connected in parallel, the female terminal of one of the battery packs pushes open the protective door and then docks with the male terminal of the other battery pack.

[0014] In an alternative embodiment, the upper plate body is recessed towards the lower plate body to form a positioning groove, and the female terminal is disposed at the bottom of the positioning groove. When two adjacent battery packs are connected in parallel, the mounting groove of one of the battery packs is inserted into the positioning groove of the other battery pack.

[0015] In an alternative embodiment, the male terminal includes a first current-carrying sheet, and the female terminal includes two relatively arranged second current-carrying sheets. When two adjacent battery packs are connected in parallel, the first current-carrying sheet of one of the battery packs is inserted between the two second current-carrying sheets of the other battery pack.

[0016] In an alternative embodiment, the battery pack further includes a handle rotatably connected to the housing. A first connecting portion is provided at one end of the handle away from the housing. A second connecting portion is provided on the housing. When two adjacent battery packs are connected in parallel, the first connecting portion of one of the battery packs is used to connect to the second connecting portion of the other battery pack.

[0017] The beneficial effects of the embodiments of the present application include: providing a battery pack, including a bottom plate, an upper cover, a first battery cell, a second battery cell, a first current-carrying busbar, a second current-carrying busbar, and a third current-carrying busbar; the upper cover is detachably and electrically connected to the bottom plate; a receiving cavity is formed between the upper cover and the bottom plate, and the first battery cell and the second battery cell are received in the receiving cavity; the BMS board is disposed on the upper cover; a positive terminal and a negative terminal are provided on the BMS board, the positive terminal is electrically connected to the second current-carrying busbar, and the negative terminal is electrically connected to the first current-carrying busbar; the first current-carrying busbar is electrically connected to the negative electrode of the first battery cell, the second current-carrying busbar is electrically connected to the positive electrode of the second battery cell, and the positive electrode of the first battery cell and the negative electrode of the second battery cell are electrically connected through the third current-carrying busbar. The battery pack includes a first battery cell and a second battery cell. Compared with the situation where the battery pack in the prior art includes only one battery cell, the volume energy density of the battery pack in the present application is increased.

[0018] In addition, the first battery cell and the second battery cell are disposed between the bottom plate and the upper cover, which not only protects the first battery cell and the second battery cell, but also groups the first battery cell and the second battery cell through the bottom plate and the upper cover, facilitating transportation and subsequent parallel connection of multiple battery packs.

[0019] In addition, the first battery cell and the second battery cell can be grouped through the bottom plate and the upper cover, and the installation process is simple, saving costs.

[0020] In addition, if the first battery cell and the second battery cell are electrically connected through the third current-carrying busbar, the internal impedance can be reduced, which is suitable for low-voltage and high-current application scenarios. Description of the Drawings

[0021] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the figures do not constitute a scale limitation.

[0022] Figure 1 It is a schematic diagram of an implementation manner of the battery pack provided by an embodiment of the present application;

[0023] Figure 2 It is a partial explosion schematic diagram of an implementation manner of the battery pack provided by an embodiment of the present application;

[0024] Figure 3 It is a schematic diagram of another implementation manner of the battery pack provided by an embodiment of the present application;

[0025] Figure 4 It is a schematic diagram of the male terminal and the female terminal connecting the fourth current-carrying busbar and the fifth current-carrying busbar provided by an embodiment of the present application;

[0026] Figure 5 It is a schematic diagram of the male terminal provided by an embodiment of the present application;

[0027] Figure 6 It is a schematic diagram of still another implementation manner of the battery pack provided by an embodiment of the present application;

[0028] Figure 7 It is provided along the Figure 6 Cross-sectional view of P in;

[0029] Figure 8 It is a cross-sectional view of an implementation manner of two battery packs in parallel provided by an embodiment of the present application;

[0030] Figure 9 It is provided by an embodiment of the present application Figure 8 Enlarged schematic diagram of part A in;

[0031] Figure 10 It is a cross-sectional view of another implementation manner of two battery packs in parallel provided by an embodiment of the present application. Detailed Description of the Embodiments

[0032] To facilitate the understanding of the present application, the following provides a more detailed description of the present application in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is described as "electrically connected to" another element, it can be directly electrically connected to the other element, or there can be one or more intermediate elements therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions used in this specification are only for the purpose of illustration.

[0033] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not used to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0034] Please refer to Figure 1 , Figure 2 and Figure 3 simultaneously. An embodiment of the present application provides a battery pack 100. The battery pack 100 includes a bottom plate 1, an upper cover 2, a first battery cell 3a, a second battery cell 3b, a first current-carrying bar 4a, a second current-carrying bar 4b, a third current-carrying bar 4c, and a BMS (Battery Management System) board 6; the upper cover 2 is detachably connected to the bottom plate 1; a receiving cavity 2s is formed between the upper cover 2 and the bottom plate 1, and the first battery cell 3a and the second battery cell 3b are received in the receiving cavity 2s; the BMS board 6 is disposed on the upper cover 2, a positive terminal 7a and a negative terminal 7b are disposed on the BMS board 6, the positive terminal 7a is electrically connected to the second current-carrying bar 4b, and the negative terminal 7b is electrically connected to the first current-carrying bar 4a; the first current-carrying bar 4a is electrically connected to the negative electrode of the first battery cell 3a, the second current-carrying bar 4b is electrically connected to the positive electrode of the second battery cell 3b, and the positive electrode of the first battery cell 3a and the negative electrode of the second battery cell 3b are electrically connected through the third current-carrying bar 4c. The battery pack 100 includes the first battery cell 3a and the second battery cell 3b. Compared with the case where the battery pack in the prior art includes only one battery cell, the present application increases the volume energy density of the battery pack 100.

[0035] In addition, the first battery cell 3a and the second battery cell 3b are disposed between the bottom plate 1 and the upper cover 2 to form the receiving cavity 2s, which not only protects the first battery cell 3a and the second battery cell 3b, but also groups the first battery cell 3a and the second battery cell 3b through the bottom plate 1 and the upper cover 2, facilitating transportation and subsequent parallel connection of multiple battery packs 100.

[0036] In addition, the first battery cell 3a and the second battery cell 3b can be grouped by the bottom plate 1 and the upper cover 2, with a simple installation process and cost savings.

[0037] In addition, if the first battery cell 3a and the second battery cell 3b are electrically connected through the third current-carrying busbar 4c, the internal impedance can be reduced, which is suitable for low-voltage and high-current application scenarios.

[0038] In addition, through the settings of the BMS board 6, the positive terminal 7a, and the negative terminal 7b, it is convenient to monitor the first battery cell 3a and the second battery cell 3b, and it is also convenient to perform parallel connection of two adjacent battery packs 100 subsequently.

[0039] It should be noted that in some embodiments, the battery pack 100 further includes at least one third battery cell 3c, and the number of the third current-carrying busbars 4c is at least two; the positive electrode of the first battery cell 3a, at least one of the third battery cells 3c, and the negative electrode of the second battery cell 3b are connected in series through the third current-carrying busbar 4c.

[0040] It can be understood that the number of the third current-carrying busbars 4c is one more than the number of the third battery cells 3c. For example, if the number of the third battery cells 3c is two, then the number of the third current-carrying busbars 4c is three. The specific way of connecting the positive electrode of the first battery cell 3a, at least one of the third battery cells 3c, and the negative electrode of the second battery cell 3b in series through the third current-carrying busbar 4c is as follows: the positive electrode of the first battery cell 3a is connected to the negative electrode of one of the third battery cells 3c through one third current-carrying busbar 4c, the positive electrode of one of the third battery cells 3c is connected to the negative electrode of another one of the third battery cells 3c through another third current-carrying busbar 4c, and the positive electrode of the other one of the third battery cells 3c is connected to the negative electrode of the second battery cell 3b through still another third current-carrying busbar 4c.

[0041] It should be noted that in some embodiments, the first battery cell 3a, the second battery cell 3b, and the third battery cell 3c are stacked and arranged regularly.

[0042] It should be noted that in some embodiments, the first current-carrying busbar 4a is electrically connected to the negative electrode of the first battery cell 3a by laser welding.

[0043] It should be noted that in some embodiments, the second current-carrying busbar 4b is electrically connected to the positive electrode of the second battery cell 3b by laser welding.

[0044] It should be noted that in some embodiments, the positive electrode of the first battery cell 3a, at least one of the third battery cells 3c, and the negative electrode of the second battery cell 3b are connected in series through the third current-carrying busbar 4c by laser welding.

[0045] It should be noted that in some embodiments, the upper cover 2 includes a first folding plate 21, a first side plate 22, an upper plate 23, a second side plate 24, and a second folding plate 25 connected in sequence; the first side plate 22 and the second side plate 24 are arranged oppositely, and an accommodation cavity 2s is formed between the first side plate 22, the upper plate 23, the second side plate 24, and the bottom plate 1; the first folding plate 21 is connected to a side of the first side plate 22 away from the upper plate 23, and the first folding plate 21 is bent relative to the first side plate 22; the second folding plate 25 is connected to a side of the second side plate 24 away from the upper plate 23, and the second folding plate 25 is bent relative to the second side plate 24; the first folding plate 21 is detachably connected to the bottom plate 1, and the second folding plate 25 is detachably connected to the bottom plate 1. Through the upper cover 2 and the bottom plate 1, the first battery cell 3a and the second battery cell 3b can be grouped, which is convenient for transportation and subsequent parallel connection of multiple battery packs 100.

[0046] It can be understood that preferably, the first folding plate 21 is connected to a side of the first side plate 22 facing away from the accommodation cavity 2s, and preferably, the second folding plate 25 is connected to a side of the second side plate 24 facing away from the accommodation cavity 2s, so as to facilitate the detachable assembly of the upper cover 2 and the bottom plate 1.

[0047] It should be noted that in some embodiments, the battery pack 100 further includes a plurality of first riveting screws 5a, and the plurality of first riveting screws 5a are distributed on the bottom plate 1; the upper cover 2 is provided with a plurality of first through holes 2h, and the plurality of first through holes 2h are distributed on the first folding plate 21 and the second folding plate 25; the number of the first riveting screws 5a is the same as the number of the first through holes 2h, and one first riveting screw 5a corresponds to one first through hole 2h. One first riveting screw 5a is used to be inserted into one first through hole 2h. Through the arrangement of the first riveting screws 5a and the first through holes 2h, the detachable connection between the upper cover 2 and the bottom plate 1 can be realized by cooperating with nuts.

[0048] It should be noted that in some embodiments, bolts or studs can be used instead of the first riveting screws 5a.

[0049] It should be noted that in some embodiments, when the upper cover 2 includes the first folding plate 21, the first side plate 22, the upper plate 23, the second side plate 24, and the second folding plate 25 connected in sequence, the BMS board 6 is specifically arranged on the first side plate 22. Since the positive terminal 7a and the negative terminal 7b are arranged on the BMS board 6, the positive terminal 7a is electrically connected to the second current-carrying busbar 4b, and the negative terminal 7b is electrically connected to the first current-carrying busbar 4a, the first current-carrying busbar 4a can be arranged close to the first side plate 22, so as to shorten the distance between the first current-carrying busbar 4a and the negative terminal 7a, facilitating the first battery cell 3a to be electrically connected to the BMS board 6 through the first current-carrying busbar 4a; the second current-carrying busbar 4b can be arranged close to the first side plate 22, so as to shorten the distance between the second current-carrying busbar 4b and the positive terminal 7a, facilitating the second battery cell 3b to be connected to the BMS board 6 through the second current-carrying busbar 4b.

[0050] In some embodiments, a plurality of second press rivet screws 5b are arranged on the first side plate 22, and the plurality of second press rivet screws 5b are distributed on the first side plate 22. A plurality of second through holes (not labeled) are arranged on the BMS board 6, and the plurality of second through holes are distributed on the BMS board 6. One second press rivet screw 5b corresponds to one second through hole, and one second press rivet screw 5b is used to be inserted into one second through hole. Through the arrangement of the second press rivet screws 5b and the second through holes, and in cooperation with nuts, the detachable connection between the upper cover 2 and the BMS board 6 can be realized.

[0051] It should be noted that in some embodiments, bolts or studs can be used instead of the second press rivet screws 5b.

[0052] In some embodiments, the number of the positive terminals 7a is at least two, and the number of the negative terminals 7b is at least two, so that large current can be shunted, reducing the current impact of the large current on a single terminal and avoiding damage.

[0053] It should be noted that in some embodiments, the BMS board 6 is further connected with a fourth current-carrying busbar 4d and a fifth current-carrying busbar 4e; the fourth current-carrying busbar 4d is electrically connected to the positive terminal 7a, and the fifth current-carrying busbar 4e is electrically connected to the negative terminal 7b; both ends of the fourth current-carrying busbar 4d are respectively electrically connected with a male terminal 8a and a female terminal 8b; both ends of the fifth current-carrying busbar 4e are respectively electrically connected with the male terminal 8a and the female terminal 8b; when two adjacent battery packs 100 are connected in parallel, the male terminal 8a of one of the battery packs 100 is used to be docked with the female terminal 8b of the other battery pack 100.

[0054] In some embodiments, please refer to Figure 4 and Figure 5The male terminal 8a includes a first positive terminal 81, a first negative terminal 82, and a first signal terminal 83, and the female terminal 8b includes a second positive terminal 801, a second negative terminal 802, and a second signal terminal 803. Two ends of the fourth current-carrying busbar 4d are electrically connected to the first positive terminal 81 and the second positive terminal 801 respectively. Two ends of the fifth current-carrying busbar 4e are electrically connected to the first negative terminal 82 and the second negative terminal 802 respectively. Both the first signal terminal 83 and the second signal terminal 803 are connected to the BMS board 6.

[0055] It should be noted that, in some embodiments, the number of the first positive terminals 81 is multiple, the number of the second positive terminals 801 is multiple, and the number of the first positive terminals 81 is the same as that of the second positive terminals 801. When two adjacent battery packs 100 are connected in parallel, one of the first positive terminals 81 of one battery pack 100 is used to dock with one of the second positive terminals 801 of the other battery pack 100. Through the arrangement of multiple first positive terminals 81 and second positive terminals 801, large current can be shunted, the current impact on a single terminal caused by large current can be reduced, so as to avoid burning out, and the safety and stability during the use of the terminals are enhanced.

[0056] It should be noted that, in some embodiments, the number of the first negative terminals 82 is multiple, the number of the second negative terminals 802 is multiple, and the number of the first negative terminals 82 is the same as that of the second negative terminals 802. When two adjacent battery packs 100 are connected in parallel, one of the first negative terminals 82 of one battery pack 100 is used to dock with one of the second negative terminals 802 of the other battery pack 100. Through the arrangement of multiple first negative terminals 82 and second negative terminals 802, large current can be shunted, the current impact on a single terminal caused by large current can be reduced, so as to avoid burning out, and the safety and stability during the use of the terminals are enhanced.

[0057] In some embodiments, along the docking direction D1 of the male terminal 8a of one battery pack 100 and the female terminal 8b of the other battery pack 100, the size of the first positive terminal 81 is higher than that of the first signal terminal 83, the size of the first negative terminal 82 is higher than that of the first signal terminal 83, the size of the second positive terminal 801 is higher than that of the second signal terminal 803, and the size of the second negative terminal 802 is higher than that of the second signal terminal 803. With this arrangement, when two adjacent battery packs 100 are connected in parallel, power is supplied first and then the signal is connected, enabling safe parallel connection between the two adjacent battery packs 100; when the male terminal 8a of one battery pack 100 is pulled out from the female terminal 8b of the other battery pack 100, the signal is disconnected first, the system triggers a power-off signal, and then the current loop is cut off, so that the connection between the two adjacent battery packs 100 can be safely disconnected.

[0058] It should be noted that in some embodiments, a parallel connection positive terminal 7c and a parallel connection negative terminal 7d are further provided on the BMS board 6. The parallel connection positive terminal 7c is electrically connected to the fourth current-carrying busbar 4d, and the parallel connection negative terminal 7d is electrically connected to the fifth current-carrying busbar 4e. Through the parallel connection positive terminal 7c and the parallel connection negative terminal 7d, large current can be shunted, which is more suitable for low-voltage and high-current application scenarios.

[0059] It should be noted that in some embodiments, the number of the parallel connection positive terminals 7c is two, and the number of the parallel connection negative terminals 7d is two, so that large current can be better shunted.

[0060] In some embodiments, the fourth current-carrying busbar 4d is provided with a third via hole 4d1, and the fifth current-carrying busbar 4e is provided with a fourth via hole 4e1. The third via hole 4d1 is used for the electrical connection between the parallel connection positive terminal 7c and the fourth current-carrying busbar 4d, and the fourth via hole 4e1 is used for the electrical connection between the parallel connection negative terminal 7d and the fifth current-carrying busbar 4e.

[0061] It should be noted that in some embodiments, please refer to Figure 6 、 Figure 7 and Figure 8, the battery pack 100 further includes a housing 1c, the housing 1c has a first side surface 1c1, an upper plate body 1c2, a second side surface 1c3 and a lower plate body 1c4 that are sequentially connected, the lower plate body 1c4 is connected to the first side surface 1c1, and the upper plate body 1c2 and the lower plate body 1c4 are disposed opposite to each other; the female terminal 8b is disposed on the upper plate body 1c2; the lower plate body 1c4 is recessed in a direction away from the upper plate body 1c2 to form a mounting groove 11s, and the male terminal 8a is located in the mounting groove 11s; a mounting hole 11h is opened at the bottom of the mounting groove 11s. The male terminal 8a can be protected through the mounting groove 11s, and the docking of the female terminal 8b and the male terminal 8a can be realized through the mounting hole 11h.

[0062] It should be noted that, in some embodiments, the battery pack 100 further includes a protection door 9, the protection door 9 covers the mounting hole 11h, the protection door 9 is rotatably connected to the lower plate body 1c4 of the housing 1c, and when two adjacent battery packs 100 are combined, after the female terminal 8b of one of the battery packs 100 pushes open the protection door 9, it is docked with the male terminal 8a of the other battery pack 100. Through the protection door 9, the female terminal 8b is protected, and the service life of the female terminal 8b is extended.

[0063] In some embodiments, the protection door 9 is a two-piece type that opens in opposite directions.

[0064] In some embodiments, an elastic member (not shown in the figure) is further provided on a surface of the protection door 9 facing the female terminal 8b. The elastic member can be a spring piece or a spring.

[0065] It should be noted that, in some embodiments, the upper plate body 1c2 is recessed toward the lower plate body 1c4 to form a positioning groove 21s, and the female terminal 8b is disposed at the bottom of the positioning groove 21s; when two adjacent battery packs 100 are combined, the mounting groove 11s of one of the battery packs 100 is inserted into the positioning groove 21s of the other battery pack 100. Through the setting of the positioning groove 21s, when two adjacent battery packs 100 are combined, no additional positioning device is required, and it is convenient for the male terminal 8a of one battery pack 100 to be docked with the female terminal 8b of the other battery pack 100.

[0066] It should be noted that in some embodiments, the upper plate body 1c2 is recessed away from the lower plate body 1c4 to form a positioning protrusion 1c21, and the lower plate body 1c4 is recessed toward the upper plate body 1c2 to form a hollow groove 12s. When two adjacent battery packs 100 are combined, the positioning protrusion 1c21 of one of the battery packs 100 is inserted into the hollow groove 12s of the other battery pack 100. When two adjacent battery packs 100 are combined, both the positioning protrusion 1c21 and the hollow groove 12s are used for positioning.

[0067] It should be noted that in some embodiments, please refer to Figure 8 and Figure 9 , the male terminal 8a includes a first current-carrying sheet 8a1, and the female terminal 8b includes two relatively arranged second current-carrying sheets 8b1. When two adjacent battery packs 100 are combined, the first current-carrying sheet 8a1 of one of the battery packs 100 is inserted between the two second current-carrying sheets 8b1 of the other battery pack 100. Through the first current-carrying sheet 8a1 and the second current-carrying sheet 8b1, when two adjacent battery packs 100 are combined, electrical connection between the male terminal 8a of one battery pack 100 and the female terminal 8b of the other battery pack 100 is achieved.

[0068] It should be noted that in some embodiments, the battery pack 100 further includes a handle 10, the handle 10 is rotatably connected to the housing 1c, and a first connecting portion 101 is provided at one end of the handle 10 away from the housing 1c; a second connecting portion 1c11 is provided on the housing 1c. When two adjacent battery packs 100 are combined, the first connecting portion 101 of one of the battery packs 100 is used to connect with the second connecting portion 1c11 of the other battery pack 100. When moving the battery pack 100, it can be conveniently moved through the handle 10. In addition, through the first connecting portion 101 provided at one end of the handle 10 away from the housing 1c, connection between two adjacent battery packs 100 can be realized, reducing the risk of connection failure of internal components of the battery pack 100 during transportation bumps.

[0069] It should be noted that the first connecting portion 101 can be in a convex shape, for example Figure 9 as shown, the second connecting portion 1c11 can be a groove, so that the first connecting portion 101 of one battery pack 100 can be inserted into the second connecting portion 1c11 of the other battery pack 100 to realize connection between two adjacent battery packs 100.

[0070] It should be noted that the first connecting portion 101 can be provided with a fixing screw 1011, for example Figure 10As shown, the first connecting portion 101 of one battery pack 100 can be screwed to the second connecting portion 1c11 of another battery pack 100 to achieve the connection between two adjacent battery packs 100.

[0071] It should be noted that the number of the handles 10 is two. One handle 10 is rotatably connected to the first side surface 1c1, and one handle 10 is rotatably connected to the second side surface 1c3. The number of the second connecting portions 1c11 is two. One second connecting portion 1c11 is disposed on the first side surface 1c1, and one second connecting portion 1c11 is disposed on the second side surface 1c3.

[0072] It should be noted that in some embodiments, the first battery cell 3a, the second battery cell 3b, and the third battery cell 3c of the battery pack 100 all adopt square battery cells, which make better use of the accommodation space of the battery pack 100 than the commonly used cylindrical battery cells, so the volume energy density is greater.

[0073] It should be noted that the description and drawings of the present application provide preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments do not impose additional limitations on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosed content of the present application more thorough and comprehensive. Moreover, the above technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as within the scope described in the specification of the present application. Further, those of ordinary skill in the art can make improvements or changes according to the above description, and all such improvements and changes should fall within the protection scope of the appended claims of the present application.

Claims

1. A battery pack, characterized in that: include: Bottom plate, upper cover, BMS board, first battery cell, second battery cell, first overflow bar, second overflow bar and third overflow bar; The upper cover is detachably connected to the bottom plate; A receiving cavity is formed between the upper cover and the bottom plate, and the first battery cell and the second battery cell are received in the receiving cavity; The BMS board is arranged on the upper cover; a positive terminal and a negative terminal are arranged on the BMS board, the positive terminal is electrically connected to the second overflow bar, and the negative terminal is electrically connected to the first overflow bar; The first overflow bar is electrically connected to the negative electrode of the first battery cell, the second overflow bar is electrically connected to the positive electrode of the second battery cell, and the positive electrode of the first battery cell and the negative electrode of the second battery cell are electrically connected through the third overflow bar; The upper cover comprises a first folding plate, a first side plate, an upper plate, a second side plate and a second folding plate which are connected in sequence; the first side plate and the second side plate are arranged opposite to each other, and the accommodation cavity is formed between the first side plate, the upper plate, the second side plate and the bottom plate; the first folding plate is connected to a side of the first side plate away from the upper plate, and the second folding plate is connected to a side of the second side plate away from the upper plate; The BMS board is arranged on the first side plate; the negative electrode of the first battery cell and the positive electrode of the second battery cell are both arranged close to the first side plate; The BMS board is also connected to a fourth overcurrent bar and a fifth overcurrent bar; the fourth overcurrent bar is electrically connected to the positive terminal, and the fifth overcurrent bar is electrically connected to the negative terminal; both ends of the fourth overcurrent bar are electrically connected to a male terminal and a female terminal, respectively; both ends of the fifth overcurrent bar are electrically connected to the male terminal and the female terminal, respectively; when two adjacent battery packs are connected in parallel, the male terminal of one of the battery packs is used to connect with the female terminal of the other battery pack.

2. The battery pack according to claim 1, characterized in that: The battery pack further comprises at least one third battery cell, and the number of the third current overflow bars is at least two; The positive electrode of the first battery cell, at least one of the third battery cells, and the negative electrode of the second battery cell are connected in series via the third overflow bar.

3. The battery pack according to claim 1, characterized in that: The first folding plate is bent relative to the first side plate; the second folding plate is bent relative to the second side plate; The first folding plate is detachably connected to the bottom plate, and the second folding plate is detachably connected to the bottom plate.

4. The battery pack according to claim 3, characterized in that: The battery pack further includes a plurality of first self-clinching screws, and the plurality of first self-clinching screws are distributed on the bottom plate; The upper cover is provided with a plurality of first via holes, and the plurality of first via holes are distributed on the first folding plate and the second folding plate; The number of the first self-clinching screws is the same as the number of the first via holes, and one first self-clinching screw corresponds to one first via hole.

5. The battery pack according to claim 1, characterized in that: The BMS board is also provided with a positive terminal and a negative terminal, wherein the positive terminal is electrically connected to the fourth overcurrent bar, and the negative terminal is electrically connected to the fifth overcurrent bar.

6. The battery pack according to claim 1, characterized in that: The battery pack further includes a shell, the shell having a first side surface, an upper plate, a second side surface and a lower plate connected in sequence, the lower plate being connected to the first side surface, and the upper plate and the lower plate being arranged opposite to each other; The female terminal is arranged on the upper plate; The lower plate body is recessed in a direction away from the upper plate body to form a mounting groove, and the male terminal is located in the mounting groove; The bottom of the installation groove is provided with an installation hole.

7. The battery pack according to claim 6, characterized in that: The battery pack also includes a protective door, which is covered by the mounting hole and is rotatably connected to the lower plate. When two adjacent battery packs are placed together, the female terminal of one of the battery packs pushes open the protective door and docks with the male terminal of the other battery pack.

8. The battery pack according to claim 6, characterized in that: The upper plate body is recessed toward the lower plate body to form a positioning groove, and the female terminal is arranged at the bottom of the positioning groove; When two adjacent battery packs are placed together, the mounting slot of one of the battery packs is plugged into the positioning slot of the other battery pack.

9. The battery pack according to claim 1, characterized in that: The male terminal includes a first current-passing plate, and the female terminal includes two second current-passing plates arranged opposite to each other. When two adjacent battery packs are connected in parallel, the first current-passing plate of one of the battery packs is inserted between the two second current-passing plates of the other battery pack.

10. The battery pack according to claim 6, characterized in that: The battery pack further comprises a handle, the handle being rotatably connected to the housing, and a first connecting portion is disposed at one end of the handle away from the housing; The housing is provided with a second connection portion, and when two adjacent battery packs are packed together, the first connection portion of one of the battery packs is used to connect with the second connection portion of the other battery pack.

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