Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, the battery module comprises an end plate assembly, the end plate assembly comprises an end plate body and a floating connection assembly, and the floating connection assembly is slidably connected to the end plate body; one part of the electrical part is connected to the first area of the first plate surface, and the other part of the electrical part is connected to the second area of the first plate surface through a floating connection assembly; the battery cell is arranged on one side close to the second plate surface, and when the battery cell is in an expansion state, the first area of the end plate body moves in the direction away from the battery cell relative to the second area, and the floating connection assembly moves in the direction away from the battery cell relative to the end plate body, so that the whole electrical part moves along with the first area of the end plate body. According to the battery module and the battery pack provided by the invention, when the battery cell is in the expansion state, the floating connection assembly in sliding connection with the end plate body also moves in the direction far away from the battery cell, so that the whole electrical part can move along with the first area, keeps a relatively straight state and is prevented from being damaged.

Description

Technical Field

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

[0002] The battery module usually includes a circumferential frame formed by the existing end plate and the existing side wall, and a plurality of battery cells installed in the circumferential frame. In order to control the battery cells, the outer surface of the existing end plate is also fixedly connected to the control device. During the cyclic expansion of the battery cells, the existing end plate will bend and deform, and the control device fixedly connected to the existing end plate will also bend, thereby causing damage to the circuit board inside the control device. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a battery module and a battery pack.

[0004] Based on the above-mentioned purpose, the first aspect of the present application provides a battery module, including: an end plate assembly, including an end plate body and a floating connection assembly, the end plate body including a first plate surface and a second plate surface opposite to each other, and the floating connection assembly is slidably connected to the end plate body; an electrical component, a portion of which is connected to a first area of ​​the first plate surface, and another portion of the electrical component is connected to a second area of ​​the first plate surface through the floating connection assembly; a battery cell, which is arranged on a side close to the second plate surface, and the battery cell has an expanded state, when the battery cell is in the expanded state, the first area of ​​the end plate body moves relative to the second area in a direction away from the battery cell, and the floating connection assembly moves relative to the end plate body in a direction away from the battery cell, so that the electrical component as a whole moves with the first area of ​​the end plate body.

[0005] Optionally, the end plate body is provided with a floating space along a first direction; the first direction is parallel to the thickness direction of the end plate body; the floating connection assembly is at least partially arranged in the floating space so that the floating connection assembly can move along the first direction.

[0006] Optionally, the first plate surface is provided with a floating opening, the floating opening is communicated with the floating space, and the floating connection assembly can pass through the floating opening along the first direction.

[0007] Optionally, an inner wall of the floating space and / or the floating connection assembly is provided with a limiting structure, and the limiting structure is used to limit the floating connection assembly from passing through the second plate surface.

[0008] Optionally, the floating connection assembly includes a floating seat located in the floating space, and the shape of the radial cross-section of the floating seat matches the shape of the radial cross-section of the floating space; a limiting groove is provided on the inner wall of the floating space along the second direction, and the groove wall of the limiting groove close to the second plate surface is defined as a first groove wall; the floating seat is connected to an elastic claw capable of extending and contracting along the second direction; the floating connection assembly has a stopping state of stopping movement toward the second plate surface, and when the floating connection assembly is in the stopping state, the elastic claw abuts against the first groove wall.

[0009] Optionally, the elastic claw includes a claw body, and a limiting portion formed on the claw body and protruding outward, and the limiting portion is located in the limiting groove when the elastic claw is extended; the limiting portion is provided with a first abutting surface that can abut against the first groove wall at one end close to the second plate surface.

[0010] Optionally, the free end of the claw body faces the first plate surface or the second plate surface.

[0011] Optionally, the second plate surface is provided with a mounting opening connected to the floating space, and the floating connection assembly is inserted into the floating space through the mounting opening; the limiting portion is provided with an inclined surface at least at one end away from the first abutting surface.

[0012] Optionally, a fastener is fixedly connected to a side of the floating seat away from the battery core, and the electrical component is connected to the floating seat via the fastener.

[0013] Optionally, the end plate assembly further includes a first connecting member, and the electrical component is fixedly connected to the first region via the first connecting member.

[0014] Optionally, a midline of the first connecting member along the height direction of the battery cell coincides with a midline of the floating connection assembly along the height direction of the battery cell.

[0015] Based on the same inventive concept, the second aspect of the present application also provides a battery pack, comprising a battery module and a lower shell as described in the first aspect, the bottom wall of the end plate body is fixedly connected to the lower shell, and along the height direction of the end plate body, the second area is located between the first area and the bottom wall.

[0016] Optionally, the bottom wall is glued and fixed to the lower shell.

[0017] From the above description, it can be seen that in the battery module and battery pack provided by the present application, a part of the electrical components is connected to the first area of ​​the first plate surface, and the other part is connected to the second area of ​​the first plate surface through a floating connection assembly. When the battery cell arranged on the side of the end plate body close to the second plate surface is in an expanded state, the first area of ​​the end plate body moves in a direction away from the battery cell relative to the second area. At this time, the floating connection assembly slidably connected to the end plate body also moves in a direction away from the battery cell to reduce the constraint of the second area of ​​the end plate body on the electrical components, so that the electrical components as a whole can move with the first area and maintain a relatively straight state, which helps to improve the problem of damage to the electrical components due to bending of the end plate body, so as to ensure the safety of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a side view schematic diagram of the control device in the related art bending and deformation along with the existing end plate;

[0020] Figure 2 A three-dimensional schematic diagram of a battery module according to an embodiment of the present application;

[0021] Figure 3 An exploded schematic diagram of a battery module according to an embodiment of the present application;

[0022] Figure 4 A schematic diagram of a first panel of a battery module according to an embodiment of the present application;

[0023] Figure 5 It is a side view schematic diagram of a battery cell in an expanded state according to an embodiment of the present application;

[0024] Figure 6 for Figure 4 A partial cutaway diagram of the AA section;

[0025] Figure 7 It is a partial cutaway schematic diagram of the AA section after the floating connection component is moved;

[0026] Figure 8 A schematic diagram of a second panel of a battery module according to an embodiment of the present application;

[0027] Fig. 9 A front perspective schematic diagram of a floating connection assembly of a first structure of a battery module according to an embodiment of the present application;

[0028] Fig.10 A rear perspective schematic diagram of a floating connection assembly of a first structure of a battery module according to an embodiment of the present application;

[0029] Fig.11 A partial cutaway schematic diagram of a floating connection assembly of a second structure of a battery module according to an embodiment of the present application at section AA;

[0030] Fig.12 A front perspective schematic diagram of a floating connection assembly of a second structure of a battery module according to an embodiment of the present application;

[0031] Fig.13 A rear perspective schematic diagram of a floating connection assembly of a second structure of a battery module according to an embodiment of the present application;

[0032] Fig.14 A partial cross-sectional schematic diagram of a floating connection assembly of a third structure of a battery module of an embodiment of the present application at section AA;

[0033] Fig.15 A front perspective schematic diagram of a floating connection assembly of a third structure of a battery module according to an embodiment of the present application;

[0034] Fig.16 This is a back-view stereoscopic schematic diagram of a floating connection assembly of a third structure of a battery module according to an embodiment of the present application.

[0035] Description of reference numerals:

[0036] 10. Existing end plate; 20. Control device; 30. Existing nut;

[0037] 100, end plate assembly;

[0038] 110, end plate body; 111, first plate surface; 112, second plate surface; 113, floating space; 114, floating opening; 115, limiting groove; 1151, first groove wall; 1152, second groove wall; 116, installation opening; 117, bottom wall;

[0039] 120. output pole base; 130. first connecting member;

[0040] 200, middle plate; 300, side plate; 400, module cover;

[0041] 500, battery cell group; 510, battery cell; 511, pole;

[0042] 600, bus bar assembly; 610, module bar; 620, electrode output terminal;

[0043] 700, electrical parts;

[0044] 800, floating connection assembly; 810, floating seat; 820, elastic claw; 821, limiting portion; 8211, first abutting surface; 8212, inclined surface; 8213, first sub-portion; 8214, second sub-portion; 8215, second abutting surface; 822, claw body; 830, fastener;

[0045] 900. Lower shell. DETAILED DESCRIPTION

[0046] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0047] It should be noted that the relative arrangement of the components, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

[0048] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0049] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0050] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0051] like Figure 1 , Figure 1 The schematic diagram of the control device 20 in the related art bending along with the existing end plate 10 is shown. The control device 20 is connected to the outer plate surface of the existing end plate 10.

[0052] Exemplarily, the control device 20 may be a slave control board, which is connected to an integrated busbar (Cells Contact System, CCS).

[0053] Generally, the control device 20 is fixedly connected by bolts and existing nuts 30 embedded in the existing end plate 10. During the cyclic expansion of the existing battery cell (not shown in the figure) inside the existing end plate 10, the existing end plate 10 will be compressed and deformed. The existing nuts 30 on the existing end plate 10 exert a large force on the control device 20 through the bolts, so that the control device 20 will bend and deform with the deformation of the existing end plate 10, such as Figure 1 , which in turn causes the printed circuit board (PCB) inside the control device 20 to bend and be damaged.

[0054] In order to solve the above problems, the present application provides a battery module. Figure 2 , Figure 2 The battery module includes two end plate assemblies 100 and two side plates 300 , which together form a circumferential frame of the battery module, and a module upper cover 400 is disposed above the circumferential frame.

[0055] like Figure 3 , Figure 3 The exploded schematic diagram of the battery module is shown. A middle plate 200 is arranged in the circumferential frame, and the middle plate 200 can be parallel to the side plate 300. Two battery cell groups 500 are also arranged in the circumferential frame, and the battery cell group 500 is located between the middle plate 200 and the side plate 300. Each battery cell group 500 includes a battery cell group 500 along the length direction of the battery module (such as Figure 3 A plurality of battery cells 510 are arranged in the circumferential direction (in the X1 direction in the figure). A busbar assembly 600 is arranged above the battery cell group 500, and the busbar assembly 600 includes a plurality of module bars 610, and each module bar 610 is respectively connected to the poles 511 of two adjacent battery cells 510 to achieve electrical connection between the two adjacent battery cells 510. The busbar assembly 600 also includes an electrode output terminal 620 (including a positive output terminal and a negative output terminal) extending outside the circumferential frame, and the portion of the electrode output terminal 620 located in the circumferential frame is connected to the pole 511 of the corresponding battery cell 510. The end plate assembly 100 includes an end plate body 110 and an output pole base 120 connected to the top of the end plate body 110, and the output pole base 120 is used to support the electrode output terminal 620. Typically, the output pole base 120 is made of an insulating material (such as plastic).

[0056] like Figure 3The end plate body 110 includes a first plate surface 111 and a second plate surface 112 opposite to each other, and the battery cell 510 is arranged on a side close to the second plate surface 112. The battery module also includes an electrical component 700 connected to the first plate surface 111. For example, the electrical component 700 can be a slave control board. A floating connection assembly 800 is slidably connected to the end plate body 110, and the electrical component 700 can be connected to the first plate surface 111 through the floating connection assembly 800.

[0057] Specifically, Figure 4 , Figure 4 The schematic diagram of the first plate surface 111 of the end plate body 110 is shown. A portion of the electrical component 700 is connected to the first region 111a of the first plate surface 111, and another portion of the electrical component 700 is connected to the second region 111b of the first plate surface 111 through the floating connection assembly 800.

[0058] The battery cell 510 has an expanded state, such as Figure 5 , Figure 5 The schematic diagram of the side view of the battery cell 510 in the expanded state is shown. At this time, the first area 111a of the end plate body 110 moves away from the battery cell 510 relative to the second area 111b, and the floating connection assembly 800 moves away from the battery cell 510 relative to the end plate body 110, so that the electrical component 700 moves as a whole with the first area 111a of the end plate body 110.

[0059] according to Figure 5 The movement of the floating connection assembly 800 is further described by taking the structure and direction in as an example. The upper part of the electrical component 700 is connected to the first area 111a, and the lower part of the electrical component 700 is connected to the second area 111b through the floating connection assembly 800. When the battery cell 510 is in an expanded state, the end plate body 110 is squeezed and deformed by the battery cell 510, and the upper part of the electrical component 700 moves away from the battery cell 510 under the push of the first area 111a. Since the floating connection assembly 800 is slidably connected to the end plate body 110, the floating connection assembly 800 can move with the electrical component 700 in the direction away from the battery cell 510. At this time, the lower part of the electrical component 700 is separated from the first plate surface 111 and moves with the upper part of the electrical component 700, that is, the electrical component 700 as a whole moves with the first area 111a of the end plate body 110.

[0060] In the battery module provided by the embodiment of the present application, a part of the electrical component 700 is connected to the first area 111a of the first plate surface 111, and the other part is connected to the second area 111b of the first plate surface 111 through the floating connection assembly 800. When the battery cell 510 disposed on the side of the end plate body 110 close to the second plate surface 112 is in an expanded state, the first area 111a of the end plate body 110 moves in a direction away from the battery cell 510 relative to the second area 111b. At this time, the floating connection assembly 800 slidably connected to the end plate body 110 also moves in a direction away from the battery cell 510 to reduce the constraint of the second area 111b of the end plate body 110 on the electrical component 700, so that the electrical component 700 as a whole can move with the first area 111a and maintain a relatively straight state, which helps to improve the problem of damage of the electrical component 700 due to the bending of the end plate body 110, so as to ensure the safety of the battery module.

[0061] Regarding the connection method between the floating connection assembly 800 and the end plate body 110, in some embodiments, as Figure 6 , Figure 6 Shown Figure 4 The end plate body 110 is a partial cutaway diagram of the AA section. Figure 6 A floating space 113 is provided in the X1 direction in the first direction; the first direction is parallel to the thickness direction of the end plate body 110; the floating connection assembly 800 is at least partially disposed in the floating space 113 so that the floating connection assembly 800 can move along the first direction.

[0062] Exemplarily, the floating space 113 may be located within the end plate body 110; or, the floating space 113 may penetrate along the first direction to one side surface (the first surface 111 or the second surface 112) of the end plate body 110; or, the floating space 113 may penetrate along the first direction to both side surfaces of the end plate body 110.

[0063] Figure 6 The battery cell 510 is shown in an unexpanded state, at which time the end plate body 110 is not deformed and the floating connection assembly 800 is not moved. Figure 7 , Figure 7 FIG. 5 shows a case where the battery cell 510 is in an expanded state, the end plate body 110 is deformed, and the floating connection assembly 800 moves along the first direction. Figure 6 By comparison, it can be seen that when the end plate body 110 is deformed, the floating space 113 can provide movement space for the floating connection assembly 800 , so that the floating connection assembly 800 can move along the first direction relative to the end plate body 110 .

[0064] like Figure 6In some embodiments, the first plate surface 111 is provided with a floating opening 114 , the floating opening 114 is communicated with the floating space 113 , and the floating connection assembly 800 can pass through the floating opening 114 along the first direction.

[0065] Illustratively, when not moving, the floating connection assembly 800 may be completely located in the floating space 113 and not extend out of the first plate surface 111 ; alternatively, the floating connection assembly 800 may be partially located in the floating space 113 and partially extend out of the first plate surface 111 through the floating opening 114 .

[0066] It should be noted that if the floating connection assembly 800 cannot pass through the floating opening 114, then the size of the floating space 113 along the first direction needs to be no less than the sum of the size of the floating connection assembly 800 itself along the first direction and its maximum moving distance, which will impose certain limitations on the thickness design of the end plate body 110 and the size design of the floating connection assembly 800.

[0067] If the floating connection assembly 800 can extend out of the first plate surface 111 through the floating opening 114, it is sufficient to ensure that the size of the floating space 113 along the first direction is greater than the maximum moving distance of the floating connection assembly 800. This helps to make the structural design of the end plate body 110 and the floating connection assembly 800 more flexible.

[0068] Combination Figure 3 To further explain, the electrical component 700 is connected to the first board surface 111. When the electrical component 700 is connected to the floating connection assembly 800, if the floating connection assembly 800 moves toward the second board surface 112 without restriction, the distance between the floating connection assembly 800 and the electrical component 700 will increase, and it is possible that after the electrical component 700 is attached to the first board surface 111, the electrical component 700 still cannot be reliably connected to the floating connection assembly 800. Even if the floating space 113 passes through the second board surface 112, the floating connection assembly 800 may also escape from the floating space 113 or collide with the battery cell 510 inside the battery module, causing adverse effects on the battery cell 510.

[0069] Therefore, in order to avoid the above situation, in some embodiments, Figure 6 The inner wall of the floating space 113 and / or the floating connection assembly 800 is provided with a limiting structure, and the limiting structure is used to limit the floating connection assembly 800 from passing through the second plate surface 112.

[0070] Exemplarily, the limiting structure may be a protrusion provided on the inner wall of the floating space 113 and protruding toward the floating connection assembly 800; or, a protrusion provided on the floating connection assembly 800 and protruding toward the inner wall of the floating space 113; or, the limiting structure may include a groove provided on the floating connection assembly 800, and a protrusion provided on the inner wall of the floating space 113 and extending into the groove.

[0071] The battery module of this embodiment is provided with a limiting structure to limit the floating connection assembly 800 from passing through the second plate surface 112, thereby preventing the floating connection assembly 800 from causing adverse effects on other components of the battery module during the movement along the first direction.

[0072] like Figure 4 In some embodiments, the floating connection assembly 800 includes a floating seat 810 located in the floating space 113, and the shape of the radial cross-section of the floating seat 810 matches the shape of the radial cross-section of the floating space 113. Figure 6 , the floating space 113 is along the second direction (such as Figure 6 A limiting groove 115 is provided on the inner wall (in the Y1 direction), and the groove wall of the limiting groove 115 close to the second plate surface 112 is defined as a first groove wall 1151; the floating seat 810 is connected with an elastic claw 820 capable of extending and contracting along the second direction; the floating connection component 800 has a stopping state of stopping movement toward the second plate surface 112, and when the floating connection component 800 is in the stopping state, the elastic claw 820 abuts against the first groove wall 1151.

[0073] Exemplarily, the floating seat 810 may be made of insulating material, such as plastic.

[0074] Exemplarily, the floating seat 810 and the elastic claw 820 may both be made of elastic material.

[0075] Exemplarily, one, two or more limiting grooves 115 may be provided around the axis (parallel to the first direction) of the floating space 113 .

[0076] In this embodiment, the floating space 113 can limit the radial movement of the floating connection assembly 800, ensuring that the floating connection assembly 800 can only move along the first direction, and preventing the portion of the electrical component 700 connected to the end plate body 110 through the floating connection assembly 800 from sliding on the first plate surface 111. The connection reliability between the electrical component 700 and the end plate body 110 is guaranteed to a certain extent.

[0077] Since the shape of the radial cross section of the floating space 113 matches the shape of the radial cross section of the floating seat 810, the gap between the inner wall of the floating space 113 and the floating seat 810 is small. In order to set a limiting structure between the two, an elastic claw 820 that can stretch and shrink along the second direction is connected to the floating seat 810. During the process of inserting the floating seat 810 into the floating space 113 along the first direction, the elastic claw 820 can shrink to avoid hindering the movement of the floating seat 810. After the floating seat 810 is inserted to the preset position, the elastic claw 820 can stretch so that the elastic claw 820 at least partially extends into the limiting groove 115. During the process of the floating connection assembly 800 moving toward the second plate surface 112, the elastic claw 820 in the limiting groove 115 constantly approaches the first groove wall 1151. After the floating connection assembly 800 moves to the preset position, the elastic claw 820 abuts against the first groove wall 1151 to prevent the floating connection assembly 800 from continuing to move, thereby realizing the limiting function. At this time, the floating connection assembly 800 is in a stopped state.

[0078] like Fig. 9 , Fig. 9 The front perspective schematic diagram of the floating connection assembly 800 of the first structure is shown. In some embodiments, the elastic claw 820 includes a claw body 822 and a limiting portion 821 formed on the claw body 822 and protruding outward, and the limiting portion 821 is located in the limiting groove 115 when the elastic claw 820 is extended. Fig.10 , Fig.10 The rear perspective view of the first structure of the floating connection assembly 800 is shown. The end of the limiting portion 821 close to the second plate surface 112 is provided with a first abutting surface 8211 capable of abutting against the first groove wall 1151 .

[0079] Exemplarily, the limiting portion 821 and the claw body 822 may be fixedly connected or may be an integrally formed structure.

[0080] Illustratively, along the first direction, the size of the limiting groove 115 is larger than the size of the limiting portion 821 to ensure that the limiting portion 821 can move along the first direction within the limiting groove 115, thereby ensuring that the floating connection assembly 800 can move along the first direction.

[0081] In this embodiment, the claw body 822 can be located in the floating space 113, and the protruding limiting portion 821 extends into the limiting groove 115. When the floating connection assembly 800 is in the stopped state, the first abutting surface 8211 abuts against the first groove wall 1151 to achieve the limiting function of the floating connection assembly 800.

[0082] The elastic claw 820 extends into the limiting groove 115 through the protruding limiting portion 821 to realize the limiting function. Compared with the structure in which the limiting function is realized by the free end of the claw body 822 abutting against the first groove wall 1151, the restriction on the setting direction of the claw body 822 can be reduced, making the design of the elastic claw 820 more flexible.

[0083] Specifically, Figure 6 ,exist Figure 6 In the structure of the floating connection assembly 800 shown, the free end of the claw body 822 faces the second plate surface 112. At this time, the first abutting surface 8211 and the free end of the claw body 822 are located on the same side, and the two can be flush.

[0084] like Fig.11 , Fig.11 The partial cutaway schematic diagram of the floating connection assembly 800 of the second structure at section AA is shown. Fig.11 In the floating connection assembly 800 shown, the free end of the claw body 822 faces the first plate surface 111. At this time, the first abutting surface 8211 and the free end of the claw body 822 face oppositely.

[0085] like Figure 8 , Figure 8 The schematic diagram of the second plate surface 112 of the end plate body 110 is shown. In some embodiments, the second plate surface 112 is provided with a mounting opening 116 communicating with the floating space 113, and the floating connection assembly 800 is inserted into the floating space 113 through the mounting opening 116. Figure 6 The limiting portion 821 is provided with an inclined surface 8212 at least at one end away from the first abutting surface 8211 .

[0086] Exemplarily, the shape of the mounting opening 116 matches the shape of the radial cross section of the floating seat 810 .

[0087] The floating connection assembly 800 is inserted into the floating space 113 along the first direction through the installation opening 116 provided on the second plate surface 112. During this process, the elastic claw 820 needs to be contracted. Therefore, an inclined surface 8212 is provided on the side of the limiting portion 821 away from the first abutting surface 8211. When the limiting portion 821 passes through the installation opening 116, the inclined surface 8212 first abuts against the edge of the installation opening 116. The edge of the installation opening 116 applies a force along the second direction to the elastic claw 820 through the inclined surface 8212, so that the elastic claw 820 contracts, thereby ensuring that the floating connection assembly 800 can be smoothly inserted into the floating space 113.

[0088] At the same time, when the floating connection assembly 800 passes through the floating opening 114, the edge of the floating opening 114 will also contract the elastic claw 820 through the inclined surface 8212, so that the floating connection assembly 800 can continue to move toward the first plate surface 111, which helps to increase the moving distance of the floating connection assembly 800 and further ensure that the electrical component 700 will not be damaged due to bending of the end plate body 110.

[0089] It should also be noted that, when the floating connection assembly 800 moves toward the first plate surface 111, although the inclined surface 8212 cannot abut against the groove wall of the limiting groove 115, the floating connection assembly 800 can only escape from the floating space 113 after the elastic claw 820 is completely contracted and deformed, and the force required to drive the elastic claw 820 to completely deform is much greater than the driving force on the electrical component 700 when the end plate body 110 is deformed. Therefore, the provision of the elastic claw 820 can also play a certain limiting role in the process of the floating connection assembly 800 moving toward the first plate surface 111.

[0090] like Fig.12 , Fig.12 A front perspective schematic diagram of a second structure of a floating connection assembly 800 is shown. Fig.12 In the illustrated floating connection assembly 800, the inclined surface 8212 is on the same side as the free end of the claw body 822, and the inclined surface 8212 extends along the first direction to the free end of the claw body 822. Fig.13 , Fig.13 The second structure of the floating connection assembly 800 is shown in a back perspective view. The first contact surface 8211 of the limiting portion 821 away from the inclined surface 8212 faces the portion where the claw body 822 is connected to the floating seat 810 .

[0091] like Fig.14 , Fig.14 The partial cutaway schematic diagram of the floating connection assembly 800 of the third structure at section AA is shown. In some embodiments, the limiting portion 821 includes a first sub-portion 8213 and a second sub-portion 8214, wherein one end of the first sub-portion 8213 close to the second plate surface 112 is connected to the free end of the claw body 822, and one end of the first sub-portion 8213 close to the first plate surface 111 is suspended, and the second sub-portion 8214 is formed on a side of the first sub-portion 8213 away from the claw body 822 and close to the first plate surface 111; the first abutting surface 8211 is provided on the first sub-portion 8213, and the inclined surface 8212 is provided on the second sub-portion 8214.

[0092] In this embodiment, the second sub-portion 8214 forms an elastic structure similar to the claw body 822. When the floating connection assembly 800 moves to the second plate surface 112 to a preset position, the first abutting surface 8211 located at the connection between the first sub-portion 8213 and the free end of the claw body 822 abuts against the first groove wall 1151, so that the floating connection assembly 800 is in a stopped state.

[0093] In some embodiments, the side wall of the limiting groove 115 close to the first plate surface 111 is a second groove wall 1152 , and a second abutting surface 8215 is further provided at one end of the first sub-portion 8213 facing the second plate surface 112 , and the second abutting surface 8215 can abut against the second groove wall 1152 .

[0094] When the floating connection assembly 800 moves toward the first plate surface 111, the second abutting surface 8215 will gradually approach the second groove wall 1152. When the second abutting surface 8215 abuts against the second groove wall 1152, a force will be generated to prevent the floating connection assembly 800 from continuing to move toward the first plate surface 111. If the force driving the floating connection assembly 800 to move (i.e., the driving force on the electrical component 700 when the end plate body 110 is deformed) is greater than the force, the first sub-portion 8213 and / or the claw body 822 will bend and deform. The floating connection assembly 800 can escape from the floating space 113 only after the claw body 822 and the first sub-section 8213 are completely contracted and deformed, and the force required to drive the claw body 822 and the first sub-section 8213 to completely deform is much greater than the driving force on the electrical component 700 when the end plate body 110 is deformed. Therefore, the provision of the claw body 822 and the first sub-section 8213 can play a certain limiting role in the process of the floating connection assembly 800 moving toward the first plate surface 111.

[0095] like Fig.15 , Fig.15 The third structure of the floating connection assembly 800 is shown in a front perspective view. The inclined surface 8212 disposed on the second sub-section 8214 is on the same side as the free end of the first sub-section 8213 , and the inclined surface 8212 can extend to a position flush with the free end of the first sub-section 8213 .

[0096] like Fig.16 , Fig.16 The third structure of the floating connection assembly 800 is shown in a back perspective view. The second sub-portion 8214 may also be provided with an inclined surface 8212 on one side thereof facing the first abutting surface 8211 .

[0097] like Figure 6 In some embodiments, a fastener 830 is fixedly connected to a side of the floating seat 810 away from the battery cell 510 , and the electrical component 700 is connected to the floating seat 810 via the fastener 830 .

[0098] For example, the fastener 830 may be a nut or a bolt.

[0099] Exemplarily, the fastener 830 may be fixedly connected to the floating seat 810 by bonding, snapping, or hot-melt connection.

[0100] Exemplarily, the shape of the radial cross section of the floating seat 810 is non-circular, so as to ensure that when the electrical component 700 is installed by the fastener 830 , the fastener 830 and the floating seat 810 will not rotate in the floating space 113 .

[0101] The fastener 830 is a nut as an example for description. When installing the electrical component 700, a bolt is passed through the electrical component 700 and is threadedly connected with the threaded hole of the nut. When the bolt is tightened, the electrical component 700 and the floating seat 810 are connected.

[0102] like Figure 5 In some embodiments, the end plate assembly 100 further includes a first connecting member 130 , and the electrical component 700 is fixedly connected to the first region 111 a via the first connecting member 130 .

[0103] Exemplarily, the first connecting member 130 and the fastening member 830 have the same or similar structures.

[0104] The electrical component 700 is fixedly connected to the first area 111a of the end plate body 110 via the first connecting member 130, so that the relative position between the electrical component 700 and the first area 111a remains unchanged, thereby further improving the connection reliability between the electrical component 700 and the end plate body 110 and preventing the electrical component 700 from falling off the end plate body 110.

[0105] like Figure 4 In some embodiments, the midline of the first connector 130 along the height direction of the battery cell (eg Figure 4 The dotted line in FIG. 8 is the middle line of the floating connection assembly 800 along the height direction of the battery cell (eg Figure 4 The dotted lines in the figure overlap.

[0106] When the first connector 130 moves along with the first region 111a in a direction away from the battery cell 510, since the first connector 130 and the floating connection assembly 800 are distributed in a straight line along the height direction of the battery cell, the force applied by the first connector 130 to the electrical component 700 and the force applied by the electrical component 700 to the floating connection assembly 800 are also located on the same straight line, which enables the floating connection assembly 800 to move more smoothly in a direction away from the battery cell 510 under the pull of the electrical component 700, further reducing the risk of bending and deformation of the electrical component 700.

[0107] Based on the same inventive concept and in combination with the description of the battery modules of the above embodiments, this embodiment provides a battery pack having the corresponding technical effects of the battery modules of the above embodiments, which will not be described in detail herein.

[0108] like Figure 5 The present embodiment provides a battery pack, including a lower housing 900 and a battery module as described in the above embodiments, wherein the bottom wall 117 of the end plate body 110 is fixedly connected to the lower housing 900, and the end plate body 110 is provided with a plurality of holes 117a and 117b of the battery pack. Figure 5 The second region 111b is located between the first region 111a and the bottom wall 117 (in the Z1 direction).

[0109] Exemplarily, the lower shell 900 may be fixedly connected to the bottom wall 117 of the end plate body 110 by welding, adhesive connection, snap connection or fastener connection.

[0110] according to Figure 5 The structure and direction shown are further explained. The lower shell 900 is located below the battery cell 510. When the battery cell 510 is in an expanded state, the lower shell 900 will constrain the end plate body 110 through the bottom wall 117 of the end plate body 110, so that the part of the end plate body 110 close to the lower shell 900 is not easy to deform, while the part relatively far away from the lower shell 900 is easier to deform (i.e., moves in the direction away from the battery cell 510), that is, the second area 111b is closer to the bottom wall 117 than the first area 111a.

[0111] In some embodiments, the bottom wall 117 is glued and fixed to the lower shell 900 .

[0112] In order to simplify the connection process between the lower shell 900 and the end plate body 110 , in this embodiment, an adhesive process is selected to achieve a fixed connection between the lower shell 900 and the bottom wall 117 of the end plate body 110 .

[0113] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0114] The various embodiments in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0115] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present application, and to enable those of ordinary skill in the art to understand the present application and thus design various embodiments with various modifications suitable for specific purposes.

[0116] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0117] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0118] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A battery module, characterized in that: include: An end plate assembly, comprising an end plate body and a floating connection assembly, wherein the end plate body comprises a first plate surface and a second plate surface opposite to each other, and the floating connection assembly is slidably connected to the end plate body; an electrical component, a portion of which is connected to a first area of ​​the first panel surface, and another portion of which is connected to a second area of ​​the first panel surface through the floating connection assembly; A battery cell is arranged on a side close to the second plate surface, and the battery cell has an expanded state. When the battery cell is in the expanded state, the first area of ​​the end plate body moves in a direction away from the battery cell relative to the second area, and the floating connection assembly moves in a direction away from the battery cell relative to the end plate body, so that the electrical component as a whole moves with the first area of ​​the end plate body.

2. The battery module according to claim 1, characterized in that: The end plate body is provided with a floating space along a first direction; the first direction is parallel to the thickness direction of the end plate body; the floating connection assembly is at least partially arranged in the floating space so that the floating connection assembly can move along the first direction.

3. The battery module according to claim 2, characterized in that: The first plate surface is provided with a floating opening, the floating opening is communicated with the floating space, and the floating connection assembly can pass through the floating opening along the first direction.

4. The battery module according to claim 2, characterized in that: The inner wall of the floating space and / or the floating connection assembly is provided with a limiting structure, and the limiting structure is used to limit the floating connection assembly from passing out of the second plate surface.

5. The battery module according to claim 4, characterized in that: The floating connection assembly comprises a floating seat located in the floating space, and the shape of the radial cross section of the floating seat matches the shape of the radial cross section of the floating space; The inner wall of the floating space along the second direction is provided with a limiting groove, and the groove wall of the limiting groove close to the second plate surface is defined as a first groove wall; the floating seat is connected with an elastic claw capable of extending and contracting along the second direction; The floating connection assembly has a stopping state in which it stops moving toward the second plate surface. When the floating connection assembly is in the stopping state, the elastic claw abuts against the first groove wall.

6. The battery module according to claim 5, characterized in that: The elastic claw includes a claw body, and a limiting portion formed on the claw body and protruding outward, and the limiting portion is located in the limiting groove when the elastic claw is extended; the limiting portion is provided with a first abutting surface that can abut against the first groove wall at one end close to the second plate surface.

7. The battery module according to claim 6, characterized in that: The free end of the claw body faces the first plate surface or the second plate surface.

8. The battery module according to claim 6, characterized in that: The second plate surface is provided with a mounting opening communicated with the floating space, and the floating connection assembly is inserted into the floating space through the mounting opening; the limiting portion is provided with an inclined surface at least at one end away from the first abutting surface.

9. The battery module according to claim 5, characterized in that: A fastener is fixedly connected to a side of the floating seat away from the battery core, and the electrical component is connected to the floating seat via the fastener.

10. The battery module according to claim 1, characterized in that: The end plate assembly further includes a first connecting member, and the electrical component is fixedly connected to the first region via the first connecting member.

11. The battery module according to claim 10, characterized in that: A midline of the first connecting member along the height direction of the battery cell coincides with a midline of the floating connection assembly along the height direction of the battery cell.

12. A battery pack, characterized in that: It comprises a battery module and a lower shell as described in any one of claims 1 to 11, wherein the bottom wall of the end plate body is fixedly connected to the lower shell, and along the height direction of the end plate body, the second area is located between the first area and the bottom wall.

13. The battery pack according to claim 12, characterized in that: The bottom wall is glued and fixed to the lower shell.

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