Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a box body assembly, a battery cell assembly and a limiting assembly, a containing cavity is formed in the box body assembly, the battery cell assembly and the limiting assembly are arranged in the containing cavity, the limiting assembly is located around the battery cell assembly so as to limit the position of the battery cell assembly in the containing cavity, and the limiting assembly and the box body assembly are movably connected in the limiting direction. The position of the battery cell assembly in the box body assembly is limited through the limiting assembly, so that the battery cell assembly and the box body assembly can be directly grouped, a module does not need to be manufactured firstly and then fixed into the box body assembly, and the limiting assembly and the box body assembly are movably connected in the limiting direction; and the limiting degree of the limiting assembly on the battery cell assembly in the assembling process can be adjusted according to the actual situation, so that the battery cell assembly is prevented from being crushed.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack. Background Art

[0002] With the development of new energy vehicle technology, battery systems, as the heart of new energy vehicles, are subject to increasingly stringent requirements for safety and endurance. Traditional battery systems, when integrating cells, most require stacking the cells first. These cells are then laser-welded with end plates, steel strips, and other components to form a battery module. The module is then placed into the battery pack housing to complete the battery pack structure. This traditional battery pack integration method requires a large number of parts, resulting in a cumbersome assembly process. Furthermore, the cell components are often rigidly restrained, which can easily damage them during assembly, impacting the battery pack's performance. Utility Model Content

[0003] An embodiment of the present application provides a battery pack that can improve the technical problem that battery cell components are easily crushed during the battery pack assembly process.

[0004] An embodiment of the present application provides a battery pack, comprising:

[0005] A box assembly is formed with a receiving cavity;

[0006] A battery cell assembly is arranged in the accommodating cavity;

[0007] A limiting assembly is provided in the accommodating cavity. The limiting assembly is located around the battery cell assembly to limit the position of the battery cell assembly in the accommodating cavity. The limiting assembly is movably connected to the box assembly along a limiting direction.

[0008] In one embodiment, the limiting direction includes a first direction, the box assembly includes two side panels arranged opposite to each other along the first direction, and a first connecting member connected to the side of the side panel facing the accommodating cavity, the limiting assembly includes two first limiting plates arranged on opposite sides of the battery cell assembly along the first direction, the two first limiting plates are used to limit the position of the battery cell assembly in the first direction, and the first limiting plates are movably connected to the corresponding side panels through the first connecting member, so that the limiting assembly and the box assembly are movably connected in the first direction.

[0009] In one embodiment, the first connecting member includes a first connecting portion and a second connecting portion connected to each other, the first connecting portion is connected to the corresponding side plate, and the second connecting portion protrudes in a direction away from the corresponding side plate and is connected to the corresponding first limiting plate.

[0010] In one embodiment, a first fixing hole is provided on the second connecting portion, a second fixing hole is provided on the first limiting plate at a position corresponding to the first fixing hole, and the second fixing hole passes through the first limiting plate along the first direction; the battery pack also includes a first fixing member, which is used to pass through the second fixing hole and be inserted into the first fixing hole to connect the first limiting plate and the first connecting member.

[0011] In one embodiment, the first fixing hole passes through the second connecting portion along the first direction, and a first locking portion is provided on a side of the second connecting portion facing the corresponding side panel. The first locking portion is provided corresponding to the first fixing hole, and the first fixing member is used to pass through the first fixing hole and be inserted into the first locking portion.

[0012] In one embodiment, the limiting direction includes a second direction, and the second direction forms an angle with the first direction; the box assembly further includes a first panel and a second panel connected between the two side panels, and a second connecting member connected to a side of the first panel facing the accommodating cavity, and the first panel and the second panel are arranged opposite to each other along the second direction;

[0013] The limiting assembly also includes a first end plate and a second end plate connected between the two first limiting plates, the first end plate and the second end plate are arranged opposite to each other along the second direction, and the first end plate and the second end plate are used to limit the position of the battery cell assembly in the second direction; the first end plate is movably connected to the first panel through the second connecting piece, so that the limiting assembly is movably connected to the box assembly in the second direction.

[0014] In one embodiment, the second connecting member has the same structure as the first connecting member.

[0015] In one embodiment, the limiting direction includes a third direction, and the third direction forms an angle with the first direction; the limiting assembly also includes a first limiting member, which is located on the side of the first limiting plate away from the bottom of the accommodating cavity, and the first limiting member is movably connected to the first limiting plate; the first limiting member is used to abut against the side of the battery cell assembly away from the bottom of the accommodating cavity to limit the position of the battery cell assembly in the third direction.

[0016] In one embodiment, the battery cell assembly includes a plurality of battery cells and a plurality of busbars electrically connected to the poles corresponding to the battery cells, and the busbars are detachably connected to the poles corresponding to the battery cells.

[0017] In one embodiment, a clamping portion is protruding from the surface of one of the poles of the battery cell and the corresponding busbar, and a clamping groove is opened at the position corresponding to the other clamping portion. The clamping portion is used to be embedded in the clamping groove so that the busbar and the pole corresponding to the battery cell can be detachably connected.

[0018] In one embodiment, the busbars are arranged in a one-to-one correspondence with the poles of the battery cells, and a third fixing hole is provided on the busbars corresponding to the poles of two adjacent battery cells. The battery pack also includes a second fixing member, which is used to be inserted into the third fixing hole so that the two adjacent battery cells are electrically connected through the corresponding busbar.

[0019] In one embodiment, the battery cell assembly includes a plurality of battery cells and a plurality of protective shells, wherein the protective shells are sleeved around the outer periphery of the battery cells;

[0020] The material of the protective shell includes insulating material; and / or,

[0021] An insulating member is provided between the battery core and the protective shell.

[0022] Beneficial effects of the embodiments of the present application:

[0023] In an embodiment of the present application, the battery pack includes a case assembly, a cell assembly, and a limiting assembly. The case assembly is formed with a receiving cavity. The cell assembly and the limiting assembly are arranged in the receiving cavity. The limiting assembly is located around the cell assembly to limit the position of the cell assembly in the receiving cavity. The limiting assembly is movably connected to the case assembly along the limiting direction. The present application uses the limiting assembly to limit the position of the cell assembly in the case assembly, so that the cell assembly and the case assembly can be directly grouped without first making a module and then fixing it to the case assembly. The limiting assembly is movably connected to the case assembly along the limiting direction, so that the degree of limiting of the cell assembly by the limiting assembly during assembly can be adjusted according to actual conditions to avoid crushing the cell assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a schematic diagram of a first exploded structure of a battery pack provided in an embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of a second exploded structure of a battery pack provided in an embodiment of the present application;

[0027] Figure 3 is a structural schematic diagram of a first connecting member provided in an embodiment of the present application;

[0028] Figure 4 is a schematic structural diagram of a second connecting member provided in an embodiment of the present application;

[0029] Figure 5 Schematic diagram of the exploded structure of a battery cell assembly provided in an embodiment of the present application;

[0030] Figure 6 The embodiments of this application provide Figure 5 Schematic diagram of the enlarged structure of area A in the middle.

[0031] Description of reference numerals:

[0032] 100, battery pack; 110, housing assembly; 111, receiving chamber; 112, side panel; 113, first connector; 1131, first connector; 1132, second connector; 1133, first fixing hole; 1134, first locking portion; 114, first panel; 115, second panel; 116, second connector; 1161, third connector; 1162, fourth connector; 1163, fourth fixing hole; 1164, second locking portion; 117, bottom plate; 118, cover; 120 , battery cell assembly; 121, battery cell; 122, bus; 1221, third fixing hole; 123, clamping portion; 124, clamping groove; 125, protective shell; 126, insulating member; 130, limiting assembly; 131, first limiting plate; 1311, second fixing hole; 132, first end plate; 1321, fifth fixing hole; 133, second end plate; 134, second limiting plate; 135, first limiting member; 136, second limiting member; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0034] The present application embodiment provides a battery pack, such as Figure 1 and Figure 2 As shown, the battery pack 100 includes a box assembly 110, which is formed with a accommodating cavity 111 for placing other components of the battery pack 100. The box assembly 110 serves as a protective shell 125 of the battery pack 100, which is used to isolate the external environment from the internal structure of the battery pack 100 to ensure the stability of the internal structure of the battery pack 100.

[0035] The battery pack 100 includes a cell assembly 120, which is arranged in the accommodating cavity 111. The cell assembly 120 includes multiple cell units distributed along a first direction X, and each cell unit includes multiple cells 121 distributed along a second direction Y, that is, the cell assembly 120 includes multiple cells 121 distributed in an array.

[0036] The battery pack 100 includes a limiting assembly 130, which is arranged in the accommodating cavity 111, and the limiting assembly 130 is located around the battery cell assembly 120 to limit the position of the battery cell assembly 120 in the accommodating cavity 111, that is, the battery cell assembly 120 can be directly assembled in the box assembly 110 and its position can be limited by the limiting assembly 130, without first making the battery cell assembly 120 into a module and then fixing it in the box assembly 110, thereby helping to simplify the assembly method of the battery pack 100.

[0037] Among them, the limiting component 130 is movably connected to the box component 110 along the limiting direction, that is, the limiting component 130 limits the position of the battery cell component 120 in the accommodating cavity 111 in the limiting direction, and the limiting component 130 and the box component 110 are movably connected, so that when the limiting component 130 is used to limit the position of the battery cell component 120, the limiting degree of the battery cell component 120 by the limiting component 130 can be adjusted by adjusting the connection degree between the limiting component 130 and the box component 110 in the limiting direction, thereby avoiding the limiting component 130 from crushing the battery cell component 120 in the limiting direction, thereby ensuring the performance of the battery pack 100.

[0038] Optional, such as Figure 1 and Figure 2As shown, the limiting direction includes a first direction X. The box assembly 110 includes two side panels 112 arranged opposite to each other along the first direction X, and a first connector 113 connected to the side of the side panels 112 facing the accommodating cavity 111. That is, the two side panels 112 form two side walls of the accommodating cavity 111, and the first connector 113 is located within the accommodating cavity 111 and connected to the side walls of the accommodating cavity 111. The limiting assembly 130 includes two first limiting plates 131 arranged on opposite sides of the battery cell assembly 120 along the first direction X. The two first limiting plates 131 are used to limit the position of the battery cell assembly 120 in the first direction X. That is, the first limiting plates 131 are located between the opposite sides of the battery cell assembly 120 and the side panels 112. The two first limiting plates 131 respectively abut against the opposite sides of the battery cell assembly 120, and the first limiting plates 131 are movably connected to the corresponding side panels 112 via the first connector 113, so that the limiting assembly 130 and the box assembly 110 are movably connected in the first direction X.

[0039] That is, while the first limiting plate 131 is assembled with the side plate 112 via the first connector 113, it also limits the position of the battery cell assembly 120 in the first direction X. This makes the assembly between the limiting assembly 130 and the box assembly 110 more flexible and convenient. When the battery pack 100 experiences an abnormality, it also facilitates the disassembly of the battery pack 100, thereby helping to improve the maintainability of the battery pack 100. In addition, because the first limiting plates 131 are movably connected to the corresponding side plates 112 via the first connector 113, when assembling the battery pack 100, the degree to which the first limiting plate 131 limits the battery cell assembly 120 can be adjusted by adjusting the degree to which the first limiting plate 131 squeezes the first connector 113, thereby preventing the limiting assembly 130 from crushing the battery cell assembly 120 in the first direction X.

[0040] Among them, such as Figure 3As shown, the first connector 113 includes a first connecting portion 1131 and a second connecting portion 1132 that are interconnected. The first connecting portion 1131 is connected to the corresponding side panel 112, while the second connecting portion 1132 protrudes away from the corresponding side panel 112 and is connected to the corresponding first limiting plate 131. That is, when assembling the battery pack 100, the first connecting portion 1131 of the first connector 113 can be directly welded to the corresponding side panel 112, while the second connecting portion 1132 protrudes away from the corresponding side panel 112. That is, the connecting surface of the second connecting portion 1132 for connecting to the first limiting plate 131 also protrudes away from the corresponding side panel 112, thereby facilitating the connection design between the first limiting plate 131 and the first connector 113. In addition, by designing the second connecting portion 1132 as a protruding structure, the second connecting portion 1132 can be compressed to a certain extent, which helps to adjust the degree of extrusion of the first limiting plate 131 on the first connecting member 113, thereby preventing the limiting component 130 from crushing the battery cell component 120 in the first direction X.

[0041] In some embodiments, the first connecting member 113 includes two first connecting portions 1131, which are respectively connected to opposite sides of the second connecting portion 1132. The first connecting member 113 is connected to the corresponding side panel 112 through the two first connecting portions 1131 to improve the connection stability between the first connecting member 113 and the side panel 112, thereby improving the connection stability between the limit assembly 130 and the box assembly 110.

[0042] In other embodiments, a first fixing hole 1133 is defined on the second connection portion 1132, and a second fixing hole 1311 is defined on the first limiting plate 131 at a position corresponding to the first fixing hole 1133. The second fixing hole 1311 penetrates the first limiting plate 131 along the first direction X, i.e., the second fixing hole 1311 is a through hole. The battery pack 100 further includes a first fixing member (not shown in the figure), which is configured to pass through the second fixing hole 1311 and be inserted into the first fixing hole 1133 to connect the first limiting plate 131 and the first connecting member 113. In other words, the first limiting plate 131 and the first connecting member 113 are connected through the mutual cooperation between the first fixing member and the fixing hole, making the connection between the first limiting plate 131 and the first connecting member 113 simple and convenient, and also convenient for disassembly in the event of an abnormality. In addition, by adjusting the tightening depth of the first fixing member, the degree of compression of the first limiting plate 131 on the first connecting member 113 can also be adjusted, thereby preventing the limiting assembly 130 from crushing the battery cell assembly 120 in the first direction X.

[0043] In some other embodiments, the first fixing hole 1133 passes through the second connecting portion 1132 along the first direction X, that is, the first fixing hole 1133 is also a through hole, and the second connecting portion 1132 is provided with a first locking portion 1134 on the side facing the corresponding side plate 112. The first locking portion 1134 is provided corresponding to the first fixing hole 1133. The first fixing member is used to pass through the first fixing hole 1133 and be inserted into the first locking portion 1134, that is, the first locking portion 1134 is provided with an internal thread and acts as a nut. The first fixing member passes through the second fixing hole 1311 and the first fixing hole 1133 in sequence and is mated with the first locking portion 1134. By welding the first locking portion 1134 to the second connecting portion 1132, the first fixing member can be directly screwed into the first locking portion 1134 for locking, which not only helps to improve the connection stability between the first limiting plate 131 and the first connecting member 113, but also helps to simplify the connection method between the first limiting plate 131 and the first connecting member 113.

[0044] It should be noted that the box assembly 110 can include multiple first connecting members 113, and the multiple first connecting members 113 are distributed in sequence along the third direction Z. The first limiting plate 131 and the corresponding side plate 112 are connected through the multiple first connecting members 113 to further improve the assembly stability between the limiting assembly 130 and the box assembly 110.

[0045] Optional, such as Figure 1 and Figure 2 As shown, the limiting direction includes a second direction Y, and the second direction Y forms an angle with the first direction X; the box assembly 110 also includes a first panel 114 and a second panel 115 connected between the two side panels 112, and a second connecting member 116 connected to the side of the first panel 114 facing the accommodating cavity 111. The first panel 114 and the second panel 115 are arranged relatively to each other along the second direction Y, that is, the first panel 114, the second panel 115 and the two side panels 112 together enclose the accommodating cavity 111, and the first panel 114 and the second panel 115 form the other two side walls of the accommodating cavity 111.

[0046] Correspondingly, the limiting assembly 130 also includes a first end plate 132 and a second end plate 133 connected between the two first limiting plates 131. The first end plate 132 and the second end plate 133 are arranged relatively to each other along the second direction Y, that is, the first end plate 132, the second end plate 133 and the two first limiting plates 131 are jointly arranged around the battery cell assembly 120, and are respectively abutted against the four sides of the battery cell assembly 120, and the first end plate 132 is movably connected to the first panel 114 through the second connecting member 116, so that the limiting assembly 130 is movably connected to the box assembly 110 in the second direction Y.

[0047] That is, while the first end plate 132 is assembled with the first panel 114 via the second connector 116, it also limits the position of the cell assembly 120 in the second direction Y. This makes assembly between the limiting assembly 130 and the housing assembly 110 more flexible and convenient. This also facilitates disassembly of the battery pack 100 when an abnormality occurs, thereby improving the maintainability of the battery pack 100. Furthermore, because the first end plate 132 is movably connected to the first panel 114 via the second connector 116, the degree to which the first end plate 132 limits the cell assembly 120 during assembly of the battery pack 100 can be adjusted by adjusting the degree to which the first end plate 132 presses the second connector 116, thereby preventing the limiting assembly 130 from crushing the cell assembly 120 in the second direction Y.

[0048] The second connecting member 116 can have the same structure as the first connecting member 113, such as Figure 4 As shown, the second connector 116 includes a third connector portion 1161 and a fourth connector portion 1162 that are interconnected. The third connector portion 1161 is connected to the first panel 114, and the fourth connector portion 1162 protrudes away from the first panel 114 and is connected to the first end plate 132. That is, when assembling the battery pack 100, the third connector portion 1161 of the second connector 116 can be directly welded to the first panel 114, while the fourth connector portion 1162 protrudes away from the first panel 114. That is, the connection surface of the fourth connector portion 1162 for connecting to the first end plate 132 also protrudes away from the first panel 114, thereby facilitating the connection design between the first end plate 132 and the first panel 114. In addition, by designing the fourth connecting portion 1162 as a protruding structure, the fourth connecting portion 1162 can be compressed to a certain extent, which helps to adjust the degree of extrusion of the first end plate 132 on the second connecting member 116, thereby preventing the limiting assembly 130 from crushing the battery cell assembly 120 in the second direction Y.

[0049] Correspondingly, in some embodiments, the second connecting member 116 includes two third connecting portions 1161, which are respectively connected to opposite sides of the fourth connecting portion 1162. The second connecting member 116 is connected to the first panel 114 through the two third connecting portions 1161 to improve the connection stability between the second connecting member 116 and the first panel 114, thereby improving the connection stability between the limit assembly 130 and the box assembly 110.

[0050] In other embodiments, a fourth fixing hole 1163 is defined in the fourth connecting portion 1162, and a fifth fixing hole 1321 is defined in the first end plate 132 at a position corresponding to the fourth fixing hole 1163. The fifth fixing hole 1321 extends through the first end plate 132 along the second direction Y, i.e., the fifth fixing hole 1321 is a through hole. The battery pack 100 further includes a third fixing member (not shown) that is configured to pass through the fifth fixing hole 1321 and into the fourth fixing hole 1163 to connect the first end plate 132 to the second connecting member 116. Specifically, the first end plate 132 and the second connecting member 116 are connected through the interaction of the third fixing member and the fixing hole. This makes the connection between the first end plate 132 and the second connecting member 116 simple and convenient, and also facilitates disassembly in the event of an abnormality. Furthermore, by adjusting the tightening depth of the third fixing member, the degree of compression of the first end plate 132 on the second connecting member 116 can be adjusted, thereby preventing the retaining assembly 130 from damaging the battery cell assembly 120 in the second direction Y.

[0051] In some other embodiments, the fourth fixing hole 1163 passes through the fourth connecting portion 1162 along the second direction Y, that is, the fourth fixing hole 1163 is also a through hole. A second locking portion 1164 is provided on the side of the fourth connecting portion 1162 facing the first panel 114. The second locking portion 1164 is provided corresponding to the fourth fixing hole 1163. The third fixing member is used to pass through the fourth fixing hole 1163 and insert into the second locking portion 1164. That is, the second locking portion 1164 is provided with an internal thread and acts as a nut. The third fixing member passes through the fourth fixing hole 1163 and the fifth fixing hole 1321 in sequence and is mated with the second locking portion 1164. By welding the second locking portion 1164 to the fourth connecting portion 1162, the third fixing member can be directly screwed into the second locking portion 1164 for locking. This not only helps to improve the connection stability between the first end plate 132 and the second connecting member 116, but also helps to simplify the connection method between the first end plate 132 and the second connecting member 116.

[0052] It should be noted that the box assembly 110 can include multiple second connecting members 116, and the multiple second connecting members 116 are distributed in sequence along the third direction Z. The first end plate 132 and the first panel 114 are connected by multiple second connecting members 116 to further improve the assembly stability between the limit assembly 130 and the box assembly 110.

[0053] Optional, such as Figure 1 and Figure 2As shown, when the battery cell assembly 120 includes multiple battery cell units distributed along the first direction X, the limiting assembly 130 also includes a second limiting plate 134, and the second limiting plate 134 is located between two adjacent battery cell units to separate the two adjacent battery cell units, that is, each battery cell unit is provided with limiting plates on two opposite sides in the first direction X to limit the position of the battery cell unit in the first direction X.

[0054] Correspondingly, the box assembly 110 also includes a bottom plate 117 and a cover plate 118 arranged relatively to each other along the third direction Z. The bottom plate 117 and the cover plate 118 are both connected to the two side plates 112, the first panel 114 and the second panel 115, that is, the bottom plate 117, the cover plate 118, the two side plates 112, the first panel 114 and the second panel 115 together form a closed accommodating cavity 111 to protect the battery cell assembly 120 located in the accommodating cavity 111.

[0055] Among them, a protrusion is formed on the bottom plate 117 at a position corresponding to the second limiting plate 134, and a threaded through hole is opened on the protrusion. On the one hand, the protrusion on the bottom plate 117 can serve as a lateral reference for placing the battery cell assembly 120, and on the other hand, it can fasten and support the second limiting plate 134 located between two adjacent battery cell units, thereby realizing a stable connection between the limiting assembly 130 and the box assembly 110.

[0056] In some embodiments, the first limiting plate 131 and the second limiting plate 134 can also serve as liquid cooling plates at the same time, that is, liquid cooling channels are formed in the first limiting plate 131 and the second limiting plate 134, and water inlets and outlets are provided to dissipate heat from the battery cell assembly 120 that is restricted on all sides, thereby reducing the risk of thermal runaway of the battery cell assembly 120 due to overheating.

[0057] Optional, such as Figure 1 and Figure 2 As shown, the limiting direction includes a third direction Z, which forms an angle with the first direction X. The limiting assembly 130 also includes a first limiting member 135, which is located on the side of the first limiting plate 131 facing away from the bottom of the accommodating cavity 111. The first limiting member 135 is movably connected to the first limiting plate 131 and is used to abut against the side of the battery cell assembly 120 facing away from the bottom of the accommodating cavity 111 to limit the position of the battery cell assembly 120 in the third direction Z. In other words, the first limiting member 135 is located on the side of the first limiting plate 131 away from the bottom plate 117, and during assembly, the first limiting member 135 is tightly connected to the first limiting plate 131 to compress the battery cell assembly 120 in the third direction Z, thereby further improving the overall assembly stability of the battery pack 100.

[0058] Correspondingly, when the battery cell assembly 120 includes a plurality of battery cell units distributed along the first direction X and the limiting assembly 130 includes a second limiting plate 134, the limiting assembly 130 also includes a second limiting member 136. The second limiting member 136 is located on a side of the second limiting plate 134 facing away from the bottom of the accommodating cavity 111. The second limiting member 136 is movably connected to the second limiting plate 134 and is configured to abut against a side of the battery cell assembly 120 facing away from the bottom of the accommodating cavity 111 to limit the position of the battery cell assembly 120 in the third direction Z. That is, the second limiting member 136 is disposed on a side of the second limiting plate 134 away from the bottom plate 117 and, during assembly, is securely connected to the second limiting plate 134 to compress the battery cell assembly 120 in the third direction Z, thereby further improving the overall assembly stability of the battery pack 100.

[0059] Among them, the first limiter 135 and the second limiter 136 can be made of metal parts with insulating surface treatment, or insulating parts 126 with strength that meets the use requirements, so as to limit the position of the battery cell assembly 120 in the third direction Z while avoiding interference with the electrical connection design of the battery cell assembly 120.

[0060] Optional, such as Figure 5 and Figure 6 As shown, the battery cell assembly 120 includes a plurality of battery cells 121 and a plurality of busbars 122 electrically connected to the poles of the corresponding battery cells 121. The busbars 122 are detachably connected to the poles of the corresponding battery cells 121, that is, each pole of the battery cell 121 is connected to a corresponding busbar 122, and the busbars 122 and the corresponding poles are detachably connected. This connection method allows for when an abnormality occurs in the battery pack 100, the busbars 122 that fit tightly with the poles of the battery cells 121 can be removed in the case of power failure, and the individual battery cells 121 can be removed, thereby helping to improve the maintainability of the battery pack 100.

[0061] In some embodiments, as Figure 6 As shown, a clamping portion 123 is protruding from the surface of one of the poles of the battery cell 121 and the corresponding busbar 122, and a clamping groove 124 is provided at the position corresponding to the other clamping portion 123. The clamping portion 123 is used to be inserted into the clamping groove 124 to detachably connect the busbar 122 to the pole of the corresponding battery cell 121. That is, the pole of the battery cell 121 and the busbar 122 are tightly fitted through the mutual clamping of the clamping portion 123 and the clamping groove 124, so as to ensure the stability of the electrical connection between the pole of the battery cell 121 and the busbar 122 while achieving a detachable connection.

[0062] It should be noted that, in addition to the method of matching the clamping portion 123 with the clamping groove 124, the battery cell 121 pole and the corresponding bus 122 can also adopt other detachable connection methods. It is only necessary to ensure the stability of the electrical connection between the battery cell 121 pole and the bus 122. No special restrictions are made here.

[0063] In other embodiments, the busbar 122 is arranged in a one-to-one correspondence with the poles of the battery cells 121, and a third fixing hole 1221 is provided on the busbar 122 corresponding to the poles of two adjacent battery cells 121. The battery pack 100 also includes a second fixing member (not shown in the figure), which is used to be inserted into the third fixing hole 1221 so that the two adjacent battery cells 121 are electrically connected through the corresponding busbar 122. That is, each battery cell 121 pole is connected to a busbar 122 respectively, and two adjacent battery cells 121 are electrically connected through the corresponding two busbars 122, and the two busbars 122 corresponding to the poles of the two adjacent battery cells 121 are provided with a third fixing hole 1221, the two busbars 122 are partially overlapped, and the third fixing holes 1221 on the two busbars 122 are aligned with each other, and the electrical connection between the two adjacent battery cells 121 can be achieved by inserting the second fixing piece into the third fixing hole 1221 of the two busbars 122, and by connecting different busbars 122 by matching the fixing piece with the fixing hole, it can be avoided that the busbar 122 cannot be tightly fitted again to connect the two battery cells 121 after being taken out due to thickness deviation of the battery cell 121.

[0064] It should be noted that, in addition to the method of matching fixing parts with fixing holes, other detachable connection methods can also be used between different busbars 122. It is only necessary to ensure that the busbars 122 can be tightly matched again after being removed. There is no special restriction here.

[0065] Optional, such as Figure 5 As shown, the cell assembly 120 includes a plurality of cell 121 and a plurality of protective casings 125, which are sleeved around the outer periphery of the cell 121. Since the cell assembly 120 directly contacts the limiting assembly 130 during assembly of the battery pack 100, the surface of the cell assembly 120 may be damaged during assembly and disassembly, thereby affecting the performance of the cell assembly 120. By sleeved around the outer periphery of the cell 121 in the cell assembly 120, a protective casing 125 is provided to prevent the limiting assembly 130 from directly contacting the cell 121, thereby protecting the cell 121.

[0066] The material of the protective shell 125 includes an insulating material, that is, the protective shell 125 itself is insulated, so that the protective shell 125 can play a protective role while also playing an insulating role, so as to avoid risks such as short circuits in the battery cell assembly 120. Alternatively, an insulating member 126 is provided between the battery cell 121 and the protective shell 125. That is, before the battery cell 121 is placed in the protective shell 125, the insulating member 126 is first attached to the surface of the battery cell 121, and then the battery cell 121 and the insulating member 126 are placed into the protective shell 125. At this time, since the battery cell 121 and the protective shell 125 are already insulated, the material of the protective shell 125 can be an insulating material or a conductive material, and there is no special limitation here.

[0067] Specifically, when assembling the battery pack 100, the following steps can be adopted:

[0068] After attaching the insulating member 126 around the battery cell 121, place it in the protective shell 125, and tightly connect the corresponding busbar 122 with the battery cell 121 pole to form the battery cell assembly 120; at the same time, assemble the box assembly 110 and the limiting assembly 130, wherein the two side panels 112, the bottom panel 117, the first panel 114, the first connecting member 113 and the second connecting member 116 in the box assembly 110 can be used as a whole and respectively assembled with the first limiting plate 131, the second limiting plate 134 and the first end plate 132 in the limiting assembly 130; then Then, place the battery cell assembly 120 into the accommodating cavity 111 of the box assembly 110, and lock the second end plate 133 in the limiting assembly 130; then, lock the bus 122 of the battery cell assembly 120 through threads to form a passage; then, lock the first limiting member 135 and the second limiting member 136 on the first limiting plate 131 and the second limiting plate 134 respectively to limit the battery assembly; then, connect the first limiting plate 131 and the second limiting plate 134 to the liquid cooling pipeline to form a cooling circuit; finally, cover the cover plate 118 to achieve the overall sealing of the battery pack 100.

[0069] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: include: A box assembly is formed with a receiving cavity; A battery cell assembly is arranged in the accommodating cavity; A limiting assembly is provided in the accommodating cavity. The limiting assembly is located around the battery cell assembly to limit the position of the battery cell assembly in the accommodating cavity. The limiting assembly is movably connected to the box assembly along a limiting direction.

2. The battery pack according to claim 1, wherein: The limiting direction includes a first direction, the box assembly includes two side panels arranged opposite to each other along the first direction, and a first connecting member connected to the side of the side panel facing the accommodating cavity, the limiting assembly includes two first limiting plates arranged on opposite sides of the battery cell assembly along the first direction, the two first limiting plates are used to limit the position of the battery cell assembly in the first direction, and the first limiting plates are movably connected to the corresponding side panels through the first connecting member, so that the limiting assembly and the box assembly are movably connected in the first direction.

3. The battery pack according to claim 2, wherein: The first connecting member includes a first connecting portion and a second connecting portion connected to each other, the first connecting portion is connected to the corresponding side plate, and the second connecting portion protrudes in a direction away from the corresponding side plate and is connected to the corresponding first limiting plate.

4. The battery pack according to claim 3, wherein: A first fixing hole is provided on the second connecting portion, a second fixing hole is provided on the first limiting plate at a position corresponding to the first fixing hole, and the second fixing hole passes through the first limiting plate along the first direction; the battery pack also includes a first fixing member, which is used to pass through the second fixing hole and be inserted into the first fixing hole to connect the first limiting plate and the first connecting member.

5. The battery pack according to claim 4, characterized in that: The first fixing hole passes through the second connecting portion along the first direction. A first locking portion is provided on the side of the second connecting portion facing the corresponding side panel. The first locking portion is provided corresponding to the first fixing hole. The first fixing piece is used to pass through the first fixing hole and be inserted into the first locking portion.

6. The battery pack according to claim 2, wherein: The limiting direction includes a second direction, and the second direction forms an angle with the first direction; the box assembly further includes a first panel and a second panel connected between the two side panels, and a second connecting member connected to the side of the first panel facing the accommodating cavity, and the first panel and the second panel are arranged opposite to each other along the second direction; The limiting assembly also includes a first end plate and a second end plate connected between the two first limiting plates, the first end plate and the second end plate are arranged opposite to each other along the second direction, and the first end plate and the second end plate are used to limit the position of the battery cell assembly in the second direction; the first end plate is movably connected to the first panel through the second connecting piece, so that the limiting assembly is movably connected to the box assembly in the second direction.

7. The battery pack according to claim 6, characterized in that: The second connecting member has the same structure as the first connecting member.

8. The battery pack according to claim 2, wherein: The limiting direction includes a third direction, and the third direction forms an angle with the first direction; the limiting assembly also includes a first limiting member, which is located on the side of the first limiting plate away from the bottom of the accommodating cavity, and the first limiting member is movably connected to the first limiting plate; the first limiting member is used to abut against the side of the battery cell assembly away from the bottom of the accommodating cavity to limit the position of the battery cell assembly in the third direction.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The battery cell assembly includes a plurality of battery cells and a plurality of busbars electrically connected to the poles corresponding to the battery cells, and the busbars are detachably connected to the poles corresponding to the battery cells.

10. The battery pack according to claim 9, characterized in that: A clamping portion is protruding from the surface of one of the poles of the battery cell and the corresponding busbar, and a clamping groove is opened at the position corresponding to the other clamping portion. The clamping portion is used to be embedded in the clamping groove so that the busbar and the pole corresponding to the battery cell can be detachably connected.

11. The battery pack according to claim 9, characterized in that: The busbars are arranged in a one-to-one correspondence with the poles of the battery cells, and a third fixing hole is provided on the busbars corresponding to the poles of two adjacent battery cells. The battery pack also includes a second fixing member, which is used to be inserted into the third fixing hole so that the two adjacent battery cells are electrically connected through the corresponding busbar.

12. The battery pack according to any one of claims 1 to 8, characterized in that: The battery core assembly includes a plurality of battery cores and a plurality of protective shells, wherein the protective shells are sleeved on the outer periphery of the battery cores; The material of the protective shell includes insulating material; and / or, An insulating member is provided between the battery core and the protective shell.

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