Battery pack

Abstract

The embodiment of the invention relates to the technical field of energy storage, in particular to a battery pack which comprises a bottom plate, an upper cover, a BMS (Battery Management System) plate, a first battery cell, a second battery cell, a first overcurrent row, a second overcurrent row and a third overcurrent row, the upper cover is detachably connected with the bottom plate; an accommodating cavity is formed between the upper cover and the bottom plate, and the first battery cell and the second battery cell are accommodated in the accommodating 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 with the second overcurrent bar, and the negative terminal is electrically connected with the first overcurrent bar; the first overcurrent row is electrically connected to the negative electrode of the first battery cell, the second overcurrent row 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 overcurrent row. The battery pack comprises the first battery cell and the second battery cell, and compared with the condition that the battery pack in the prior art comprises one battery cell, the volume energy density of the battery pack is increased.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of energy storage technology, 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. It can power external electrical devices (such as portable energy storage devices) when needed. It is widely used in daily life and provides great convenience and richness for people's daily life. A traditional battery pack includes a BMS (Battery Management System) board and a battery cell. The battery cell is electrically connected to the BMS board, and the BMS board is used to control the charge and discharge of the battery cell.

[0003] With the continuous development of the energy storage industry, the demand for the capacity of battery packs within a certain storage space continues to increase. Summary of the invention

[0004] In view of the above problems, an embodiment of the present application provides a battery pack that overcomes the above problems or at least partially solves the above problems.

[0005] According to one aspect of an embodiment of the present application, a battery pack is provided, including a bottom plate, an upper cover, a first battery cell, a second battery cell, a first overflow bar, a second overflow bar and a third overflow bar; the upper cover is detachably 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 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.

[0006] In an optional manner, the battery pack further includes 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 third battery cell and the negative electrode of the second battery cell are connected in series through the third current overflow bar.

[0007] In an optional manner, the upper cover includes a first folding plate, a first side panel, an upper panel, a second side panel and a second folding plate which are connected in sequence; the first side panel and the second side panel are arranged opposite to each other, and the accommodating cavity is formed between the first side panel, the upper panel, the second side panel and the bottom panel; the first folding plate is connected to a side of the first side panel away from the upper panel, and the first folding plate is bent relative to the first side panel; the second folding plate is connected to a side of the second side panel away from the upper panel, and the second folding plate is bent relative to the second side panel; the first folding plate is detachably connected to the bottom panel, and the second folding plate is detachably connected to the bottom panel.

[0008] In an optional embodiment, the battery pack also includes a plurality of first self-sealing screws, and the plurality of first self-sealing screws are distributed on the bottom plate; the upper cover is provided with a plurality of first vias, and the plurality of first vias are distributed on the first folding plate and the second folding plate; the number of the first self-sealing screws is the same as the number of the first vias, and one first self-sealing screw corresponds to one first via.

[0009] In an optional manner, the BMS board is arranged on the first side panel.

[0010] In an optional manner, 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; the two ends of the fourth overcurrent bar are electrically connected to a male terminal and a female terminal, respectively; the two 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.

[0011] In an optional manner, a positive terminal and a negative terminal are further provided on the BMS board, the positive terminal is electrically connected to the fourth overflow bar, and the negative terminal is electrically connected to the fifth overflow bar.

[0012] In an optional embodiment, the battery pack also includes a shell, which has a first side surface, an upper plate body, a second side surface and a lower plate body connected in sequence, the lower plate body is connected to the first side surface, and the upper plate body and the lower plate body are arranged opposite to each other; the female terminal is arranged on the upper plate body; the lower plate body is recessed in a direction away from the upper plate body to form an installation groove, and the male terminal is located in the installation groove; a mounting hole is opened at the bottom of the installation groove.

[0013] In an optional manner, the battery pack also includes a protective door, which covers 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.

[0014] In an optional manner, 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 packed together, the installation groove of one of the battery packs is plugged into the positioning groove of the other battery pack.

[0015] In an optional manner, the male terminal includes a first current-passing plate, and the female terminal includes two oppositely arranged second current-passing plates. 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.

[0016] In an optional embodiment, the battery pack also includes a handle, which is rotatably connected to the outer shell, and a first connecting portion is provided at an end of the handle away from the outer shell; a second connecting portion is provided on the outer shell, and when two adjacent battery packs are packed together, the first connecting portion of one of the battery packs is used to connect with the second connecting portion of another of the battery packs.

[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 overflow bar, a second overflow bar and a third overflow bar; the upper cover is detachably 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 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 battery pack includes the first battery cell and the second battery cell. Compared with the battery pack in the prior art including one battery cell, the present application increases the volume energy density of the battery pack.

[0018] In addition, the first battery cell and the second battery cell are arranged between the accommodating cavity formed by 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, which is convenient for transportation and subsequent packaging of multiple battery packs.

[0019] In addition, the first battery cell and the second battery cell can be grouped together through the bottom plate and the upper cover, which simplifies the installation process and saves costs.

[0020] In addition, the first battery cell and the second battery cell are electrically connected through the third current overflow bar, which can reduce the internal impedance and is suitable for low-voltage and high-current application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0022] Figure 1 is a schematic diagram of an implementation of a battery pack provided in an embodiment of the present application; Figure 2 It is a partial exploded schematic diagram of an implementation method of a battery pack provided in an embodiment of the present application; Figure 3 is a schematic diagram of another implementation of the battery pack provided in an embodiment of the present application; Figure 4 It is a schematic diagram of the male terminal and the female terminal provided in the embodiment of the present application connected to the fourth current bar and the fifth current bar; Figure 5 is a schematic diagram of a male terminal provided in an embodiment of the present application; Figure 6 is a schematic diagram of another implementation of the battery pack provided in the embodiment of the present application; Figure 7 The embodiment of the present application provides Figure 6 Sectional view of P; Figure 8 is a cross-sectional view of an implementation of two battery packs provided in an embodiment of the present application; Fig. 9 The embodiment of this application provides Figure 8 The enlarged schematic diagram of the middle part A; Fig.10 It is a cross-sectional view of another implementation of two battery packs provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present application, the present application is described in more detail below 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 centered 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 centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art 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 intended 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.

[0025] Please also read Figure 1 , Figure 2 and Figure 3 The embodiment of the present application provides a battery pack 100, which includes a bottom plate 1, an upper cover 2, a first battery cell 3a, a second battery cell 3b, a first overflow bar 4a, a second overflow bar 4b, a third overflow bar 4c and a BMS (Battery Management System). System, 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 arranged on the upper cover 2, and a positive terminal 7a and a negative terminal 7b are arranged on the BMS board 6, the positive terminal 7a is electrically connected to the second overflow bar 4b, and the negative terminal 7b is electrically connected to the first overflow bar 4a; the first overflow bar 4a is electrically connected to the negative electrode of the first battery cell 3a, the second overflow 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 overflow bar 4c. The battery pack 100 includes the first battery cell 3a and the second battery cell 3b. Compared with the battery pack in the prior art including one battery cell, the present application increases the volume energy density of the battery pack 100.

[0026] In addition, the first battery cell 3a and the second battery cell 3b are arranged between the accommodating cavity 2s formed by the bottom plate 1 and the upper cover 2, 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, which is convenient for transportation and subsequent packaging of multiple battery packs 100.

[0027] In addition, the first battery cell 3 a and the second battery cell 3 b can be grouped together through the bottom plate 1 and the upper cover 2 , which simplifies the installation process and saves costs.

[0028] In addition, the first battery cell 3a and the second battery cell 3b are electrically connected via the third overflow bar 4c, which can reduce the internal impedance and is suitable for low-voltage and high-current application scenarios.

[0029] In addition, the arrangement of the BMS board 6 , the positive terminal 7 a and the negative terminal 7 b facilitates the monitoring of the first battery cell 3 a and the second battery cell 3 b , and facilitates the subsequent merging of two adjacent battery packs 100 .

[0030] It is worth noting that, in some embodiments, the battery pack 100 further includes at least one third battery cell 3c, and the number of the third current overflow bars 4c is at least two; the positive electrode of the first battery cell 3a, at least one of the third battery cell 3c and the negative electrode of the second battery cell 3b are connected in series through the third current overflow bar 4c.

[0031] It can be understood that the number of the third overcurrent bars 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, the number of the third overcurrent bars 4c is three. The specific manner in which 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 overcurrent bar 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 a third overcurrent bar 4c, the positive electrode of one of the third battery cells 3c is connected to the negative electrode of another of the third battery cells 3c through another third overcurrent bar 4c, and the positive electrode of another of the third battery cells 3c is connected to the negative electrode of the second battery cell 3b through another third overcurrent bar 4c.

[0032] It is worth noting that, in some embodiments, the first battery cell 3 a , the second battery cell 3 b , and the third battery cell 3 c are stacked and arranged in a regular pattern.

[0033] It is worth noting that, in some embodiments, the first overflow bar 4a is electrically connected to the negative electrode of the first battery cell 3a by laser welding.

[0034] It is worth noting that, in some embodiments, the second overflow bar 4b is electrically connected to the positive electrode of the second battery cell 3b by laser welding.

[0035] It is worth noting 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 overflow bar 4c by laser welding.

[0036] It is worth noting 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 opposite to each other, and the accommodating 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 the 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 the 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 for subsequent packaging of multiple battery packs 100.

[0037] It can be understood that, preferably, the first folding plate 21 is connected to the side of the first side panel 22 facing away from the accommodating cavity 2s, and preferably, the second folding plate 25 is connected to the side of the second side panel 24 facing away from the accommodating cavity 2s, so as to facilitate the detachable assembly of the upper cover 2 and the bottom plate 1.

[0038] It is worth noting that, in some embodiments, the battery pack 100 further includes a plurality of first self-clinching screws 5a, and the plurality of first self-clinching screws 5a are distributed on the bottom plate 1; the upper cover 2 is provided with a plurality of first via holes 2h, and the plurality of first via holes 2h are distributed on the first folding plate 21 and the second folding plate 25; the number of the first self-clinching screws 5a is the same as the number of the first via holes 2h, and one first self-clinching screw 5a corresponds to one first via hole 2h. One first self-clinching screw 5a is used to be plugged into one first via hole 2h. By providing the first self-clinching screws 5a and the first via holes 2h, the upper cover 2 and the bottom plate 1 can be detachably connected with the matching nut.

[0039] It is worth noting that, in some embodiments, bolts or studs may be used instead of the first self-clinching screws 5 a.

[0040] It is worth noting 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 overflow bar 4b, and the negative terminal 7b is electrically connected to the first overflow bar 4a, the first overflow bar 4a can be arranged close to the first side plate 22, thereby shortening the distance between the first overflow bar 4a and the negative terminal 7a, and facilitating the first battery cell 3a to be electrically connected to the BMS board 6 through the first overflow bar 4a; the second overflow bar 4b can be arranged close to the first side plate 22, thereby shortening the distance between the second overflow bar 4b and the positive terminal 7a, and facilitating the second battery cell 3b to be connected to the BMS board 6 through the second overflow bar 4b.

[0041] In some embodiments, the first side panel 22 is provided with a plurality of second self-clinching screws 5b, and the plurality of second self-clinching screws 5b are distributed on the first side panel 22; the BMS board 6 is provided with a plurality of second through holes (not marked), and the plurality of second through holes are distributed on the BMS board 6; one second self-clinching screw 5b corresponds to one second through hole, and one second self-clinching screw 5b is used to be plugged into one second through hole; by setting the second self-clinching screws 5b and the second through holes, the upper cover 2 and the BMS board 6 can be detachably connected with the nut.

[0042] It is worth noting that, in some embodiments, bolts or studs may be used instead of the second self-clinching screws 5b.

[0043] 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 the large current can be diverted to reduce the current impact of the large current on a single terminal and avoid damage.

[0044] It is worth noting that, in some embodiments, the BMS board 6 is also connected to a fourth overcurrent bar 4d and a fifth overcurrent bar 4e; the fourth overcurrent bar 4d is electrically connected to the positive terminal 7a, and the fifth overcurrent bar 4e is electrically connected to the negative terminal 7b; the two ends of the fourth overcurrent bar 4d are electrically connected to a male terminal 8a and a female terminal 8b, respectively; the two ends of the fifth overcurrent bar 4e are electrically connected to the male terminal 8a and the female terminal 8b, respectively; when two adjacent battery packs 100 are packed in parallel, the male terminal 8a of one of the battery packs 100 is used to connect with the female terminal 8b of the other battery pack 100.

[0045] In some embodiments, see 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. The two ends of the fourth overcurrent bar 4d are electrically connected to the first positive terminal 81 and the second positive terminal 801, respectively. The two ends of the fifth overcurrent bar 4e are electrically connected to the first negative terminal 82 and the second negative terminal 802, respectively. The first signal terminal 83 and the second signal terminal 803 are both connected to the BMS board 6.

[0046] It is worth noting 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 the number of the second positive terminals 801. When two adjacent battery packs 100 are packed in parallel, the first positive terminal 81 of one of the battery packs 100 is used to dock with the second positive terminal 801 of another of the battery packs 100. By setting up multiple first positive terminals 81 and second positive terminals 801, large current can be diverted, reducing the current impact of large current on a single terminal and causing burning, thereby enhancing the safety and stability of the terminal during use.

[0047] It is worth noting 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 the number of the second negative terminals 802. When two adjacent battery packs 100 are packed in parallel, one of the first negative terminals 82 of the battery packs 100 is used to dock with one of the second negative terminals 802 of the other battery pack 100. By setting up multiple first negative terminals 82 and second negative terminals 802, large current can be diverted, reducing the current impact of large current on a single terminal and causing burning, thereby enhancing the safety and stability of the terminals during use.

[0048] In some embodiments, along the docking direction D1 between the male terminal 8a of one battery pack 100 and the female terminal 8b of another battery pack 100, the size of the first positive terminal 81 is larger than the size of the first signal terminal 83, the size of the first negative terminal 82 is larger than the size of the first signal terminal 83, the size of the second positive terminal 801 is larger than the size of the second signal terminal 803, and the size of the second negative terminal 802 is larger than the size of the second signal terminal 803. With this configuration, when two adjacent battery packs 100 are connected in parallel, power is first turned on and then the signal is connected, so that the two adjacent battery packs 100 can be safely connected in parallel; when the male terminal 8a of one battery pack 100 is pulled out from the female terminal 8b of another battery pack 100, the signal is disconnected first, the system will trigger 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.

[0049] It is worth noting that, in some embodiments, a positive terminal 7c and a negative terminal 7d are also provided on the BMS board 6, the positive terminal 7c is electrically connected to the fourth overcurrent bar 4d, and the negative terminal 7d is electrically connected to the fifth overcurrent bar 4e. Through the positive terminal 7c and the negative terminal 7d, large current can be shunted, which is more suitable for low-voltage and high-current application scenarios.

[0050] It is worth noting that, in some embodiments, the number of the parallel-enclosed positive terminals 7c is two, and the number of the parallel-enclosed negative terminals 7d is two, so that large currents can be better diverted.

[0051] In some embodiments, the fourth current bar 4d is provided with a third via 4d1, and the fifth current bar 4e is provided with a fourth via 4e1. The third via 4d1 is used to electrically connect the parallel positive terminal 7c with the fourth current bar 4d, and the fourth via 4e1 is used to electrically connect the parallel negative terminal 7d with the fifth current bar 4e.

[0052] It is worth noting that, in some embodiments, see Figure 6 , Figure 7 and Figure 8The battery pack 100 further includes a shell 1c, which has a first side surface 1c1, an upper plate 1c2, a second side surface 1c3 and a lower plate 1c4 connected in sequence, the lower plate 1c4 is connected to the first side surface 1c1, and the upper plate 1c2 and the lower plate 1c4 are arranged opposite to each other; the female terminal 8b is arranged on the upper plate 1c2; the lower plate 1c4 is recessed in a direction away from the upper plate 1c2 to form a mounting groove 11s, and the male terminal 8a is located in the mounting groove 11s; the bottom of the mounting groove 11s is provided with a mounting hole 11h. The male terminal 8a can be protected by the mounting groove 11s, and the female terminal 8b can be connected to the male terminal 8a by the mounting hole 11h.

[0053] It is worth noting that, in some embodiments, the battery pack 100 further includes a protection door 9, which covers the mounting hole 11h and is rotatably connected to the lower plate 1c4 of the housing 1c. When two adjacent battery packs 100 are packed together, the female terminal 8b of one of the battery packs 100 pushes the protection door 9 open and docks with the male terminal 8a of the other battery pack 100. The female terminal 8b is protected by the protection door 9, thereby extending the service life of the female terminal 8b.

[0054] In some embodiments, the protective door 9 is a double-leaf type.

[0055] In some embodiments, an elastic member (not shown) is further provided on a side of the protection door 9 facing the female terminal 8b. The elastic member may be a spring or a spring.

[0056] It is worth noting that, in some embodiments, the upper plate 1c2 is recessed toward the lower plate 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 placed side by side, the mounting groove 11s of one of the battery packs 100 is plugged into the positioning groove 21s of the other battery pack 100. By providing the positioning groove 21s, when two adjacent battery packs 100 are placed side by side, no additional positioning device is required, and the male terminal 8a of one of the battery packs 100 can be easily connected to the female terminal 8b of the other battery pack 100.

[0057] It is worth noting that, in some embodiments, the upper plate 1c2 is recessed in a direction away from the lower plate 1c4 to form a positioning protrusion 1c21, and the lower plate 1c4 is recessed toward the upper plate 1c2 to form a hollow groove 12s. When two adjacent battery packs 100 are placed together, the positioning protrusion 1c21 of one of the battery packs 100 is plugged into the hollow groove 12s of the other battery pack 100. When two adjacent battery packs 100 are placed together, the positioning protrusion 1c21 and the hollow groove 12s are both used for positioning.

[0058] It is worth noting that, in some embodiments, see Figure 8 and Fig. 9 The male terminal 8a includes a first current-passing piece 8a1, and the female terminal 8b includes two second current-passing pieces 8b1 arranged opposite to each other. When two adjacent battery packs 100 are placed in parallel, the first current-passing piece 8a1 of one of the battery packs 100 is inserted between the two second current-passing pieces 8b1 of the other of the battery packs 100. Through the first current-passing piece 8a1 and the second current-passing piece 8b1, when two adjacent battery packs 100 are placed in parallel, the male terminal 8a of one of the battery packs 100 and the female terminal 8b of the other of the battery packs 100 are electrically connected.

[0059] It is worth noting 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 connection portion 101 is provided at one end of the handle 10 away from the housing 1c; a second connection portion 1c11 is provided at the housing 1c, and when two adjacent battery packs 100 are packed together, the first connection portion 101 of one of the battery packs 100 is used to connect with the second connection portion 1c11 of the other battery pack 100. When moving the battery pack 100, it can be conveniently moved by the handle 10. In addition, the first connection portion 101 provided at one end of the handle 10 away from the housing 1c can realize the connection between two adjacent battery packs 100, thereby reducing the risk of connection failure of internal components of the battery pack 100 during bumpy transportation.

[0060] It is worth noting that the first connecting portion 101 may be in a convex shape, for example Fig. 9 As shown, the second connection portion 1c11 may be a groove, so that the first connection portion 101 of one battery pack 100 may be plugged into the second connection portion 1c11 of another battery pack 100 to achieve connection between two adjacent battery packs 100 .

[0061] It is worth noting that the first connecting portion 101 may be provided with a fixing screw 1011, for example Fig.10As shown, the first connection portion 101 of one battery pack 100 can be screwed to the second connection portion 1c11 of another battery pack 100 to achieve connection between two adjacent battery packs 100.

[0062] It is worth noting that there are two handles 10, 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. There are two second connecting parts 1c11, one second connecting part 1c11 is arranged on the first side surface 1c1, and one second connecting part 1c11 is arranged on the second side surface 1c3.

[0063] It is worth noting 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 are all square battery cells, which can make better use of the storage space of the battery pack 100 than the commonly used cylindrical battery cells, so the volume energy density is higher.

[0064] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional limitations on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present application; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to 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.

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 upper cover comprises a first folding plate, a first side plate, an upper plate, a second side plate and a second folding plate 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 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.

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 3, characterized in that: The BMS board is disposed on the first side plate.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The BMS board is also connected to a fourth overflow bar and a fifth overflow bar; The fourth current-carrying bar is electrically connected to the positive terminal, and the fifth current-carrying bar is electrically connected to the negative terminal; Two ends of the fourth current-carrying bar are electrically connected to a male terminal and a female terminal respectively; Two ends of the fifth current-carrying bar are electrically connected to the male terminal and the female terminal respectively; When two adjacent battery packs are packed together, the male terminal of one of the battery packs is used to dock with the female terminal of the other battery pack.

7. The battery pack according to claim 6, 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.

8. The battery pack according to claim 6, 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.

9. The battery pack according to claim 8, 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.

10. The battery pack according to claim 8, 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.

11. The battery pack according to claim 6, 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.

12. The battery pack according to claim 8, 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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