Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, and the battery module comprises two end plate assemblies which are arranged at an interval along a first direction; the middle plate is connected between the two end plate assemblies, the middle plate comprises a separation part and a connection part which are linearly distributed in the same plane in the first direction, and the middle plate is in insertion fit with the corresponding end plate assembly at least through the connection part; a light blocking structure protruding out of the plate face of the connecting part is arranged on at least one side plate face of the separating part. According to the battery module and the battery pack provided by the invention, the separation part and the connection part of the middle plate are linearly arranged in the same plane, so that the middle plate has relatively high appearance precision, an assembly gap between the middle plate and the end plate assembly is reduced, and the welding quality of the middle plate and the end plate assembly is further ensured. According to the battery module, the light blocking structure is arranged on the plate face of at least one side of the separation part, during welding, even if laser penetrates through the assembly gap, shielding can be conducted through the light blocking structure, and the problem that devices in the battery module are damaged due to laser irradiation during welding is avoided.

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] For an existing battery module (such as a square shell battery module), it includes an existing end plate and an existing middle plate connected to each other. Generally, the existing middle plate is inserted into the socket on the existing end plate, and the existing end plate and the existing middle plate are fixedly connected by welding.

[0003] However, in the related art, the existing middle plate is formed by stamping and bending metal profiles, which will have a certain degree of rebound deformation after forming. The existing middle plate after deformation has low matching accuracy with the jack, and a large gap may appear between the two, which will have an adverse effect on the subsequent welding process and the overall safety of the battery module. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a battery module and a battery pack.

[0005] Based on the above-mentioned purpose, the first aspect of the present application provides a battery module, including: two end plate assemblies, which are arranged at intervals along a first direction; a middle plate, connected between the two end plate assemblies, the middle plate includes a partition part and a connecting part distributed in a straight line along the first direction and in the same plane, and the middle plate is plugged and matched with the corresponding end plate assembly at least through the connecting part; at least one side surface of the partition part has a light-blocking structure protruding from the surface of the connecting part.

[0006] Optionally, the end plate assembly includes an end plate body, the end plate body is provided with a connecting through hole, the connecting through hole includes a plug-in hole section and a guide hole section, the connecting portion is plugged into and cooperates with the end plate body through the plug-in hole section, and the partition portion extends into the guide hole section; the light blocking structure is at least partially located in the guide hole section.

[0007] Optionally, a guide groove is provided at a position of the end plate body located at the guide hole section, and the guide groove corresponds to at least one side plate surface of the partition.

[0008] Optionally, the guide groove and the light blocking structure are located on the same side of the partition.

[0009] Optionally, the end plate body includes a first sub-plate body and a second sub-plate body that are independent and linearly spaced apart along a second direction, the first sub-plate body and the second sub-plate body are fixedly connected, an insertion space is defined between the first sub-plate body and the second sub-plate body, and the connecting portion is plugged into and matched with the end plate body through the insertion space; the second direction intersects with the first direction.

[0010] Optionally, the mutually adjacent side walls of the first sub-board body and the second sub-board body are spaced apart as a whole to define a gap extending from the upper end to the lower end of the end plate body between the first sub-board body and the second sub-board body, and the gap is constructed as the insertion space.

[0011] Optionally, the middle parts of the mutually adjacent side walls of the first sub-board body and the second sub-board body are spaced apart to define a through hole between the first sub-board body and the second sub-board body, and the through hole is configured as the insertion space.

[0012] Optionally, the partition is located outside the insertion space.

[0013] Optionally, along the first direction, the connecting portion is inserted into the plug-in space through an opening on one side of the plug-in space, and in the plug-in space, a welding space is formed between an end of the connecting portion and the opening on the other side of the plug-in space.

[0014] Optionally, a welding groove is provided at a position where the first sub-plate is located in the welding space and / or a position where the second sub-plate is located in the welding space.

[0015] Optionally, the light blocking structure includes a light blocking sheet, and the light blocking sheet is fixed on the plate surface of the partition.

[0016] Optionally, in the partition portion, at least a portion adjacent to the connecting portion has a thickness greater than a thickness of the connecting portion to form a step surface, and the light blocking structure includes the step surface.

[0017] Based on the same inventive concept, the second aspect of the present application also provides a battery pack, comprising the battery module as described in the first aspect.

[0018] From the above description, it can be seen that the battery module and battery pack provided by the present application have the partition and connection parts of the middle plate arranged in a straight line, which enables the middle plate to be formed by stamping and cutting, which helps to ensure that the middle plate has a high shape accuracy, so as to reduce the assembly gap between the middle plate and the end plate assembly, thereby ensuring the welding quality of the middle plate and the end plate assembly. At the same time, a light-blocking structure is provided on at least one side of the partition. During welding, even if the laser passes through the assembly gap, it can be shielded by the light-blocking structure, avoiding the problem of damage to the internal components of the battery module due to laser irradiation during welding, thereby ensuring the overall safety of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 A three-dimensional schematic diagram of a first structure of a battery module according to an embodiment of the present application;

[0021] Figure 2 A three-dimensional schematic diagram of a first structure of a module frame of a battery module according to an embodiment of the present application;

[0022] Figure 3 An exploded schematic diagram of a first structure of a battery module according to an embodiment of the present application;

[0023] Figure 4 A schematic cross-sectional top view of a first structure of a module frame of a battery module according to an embodiment of the present application;

[0024] Figure 5 for Figure 4 A magnified schematic diagram of the first structure in part A;

[0025] Figure 6 for Figure 4 An enlarged schematic diagram of the second structure in part A;

[0026] Figure 7 for Figure 4 A magnified schematic diagram of the third structure in part A;

[0027] Figure 8 for Figure 4 A magnified schematic diagram of the fourth structure in part A;

[0028] Fig. 9 for Figure 4 An enlarged schematic diagram of the fifth structure in part A;

[0029] Fig.10 for Figure 4 A magnified schematic diagram of the sixth structure in part A;

[0030] Fig.11 A three-dimensional schematic diagram of a second structure of a battery module according to an embodiment of the present application;

[0031] Fig.12 A three-dimensional schematic diagram of a second structure of a module frame of a battery module according to an embodiment of the present application;

[0032] Fig.13An exploded schematic diagram of a second structure of a battery module according to an embodiment of the present application;

[0033] Fig.14 A schematic diagram of a first structure of a plug-in space of a battery module according to an embodiment of the present application;

[0034] Fig.15 A schematic diagram of a second structure of the plug-in space of the battery module of an embodiment of the present application;

[0035] Fig.16 A schematic cross-sectional top view of a second structure of a module frame of a battery module according to an embodiment of the present application;

[0036] Fig.17 for Fig.16 The enlarged schematic diagram of the first structure in part B before welding;

[0037] Fig.18 for Fig.16 The enlarged schematic diagram of the first structure in part B after welding;

[0038] Fig.19 for Fig.16 A magnified schematic diagram of the second structure in part B.

[0039] Schematic diagram of an embodiment of the present application.

[0040] Description of reference numerals:

[0041] 100, end plate assembly; 110, end plate body; 111, connecting through hole; 1111, plug hole section; 1112, guide hole section; 112, first sub-plate body; 113, second sub-plate body; 114, plug space; 120, output pole base;

[0042] 200, middle plate; 210, partition; 211, first plate surface; 212, second plate surface; 220, connection portion;

[0043] 300, light blocking structure; 400, side panel; 500, module cover;

[0044] 600, battery cell group; 610, battery cell;

[0045] 700, module bar; 710, electrode output terminal; 800, assembly gap;

[0046] 900, welding space; 910, welding groove;

[0047] 1000. Welding fixing parts. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] The applicant has found that the reason why the existing middle plate rebounds and deforms is that it is subjected to large stress during the stamping and bending process, resulting in deformation. After forming, the stress in the existing middle plate will be partially released, so there will be a certain degree of rebound. In other words, the rebound deformation of the existing middle plate after forming is caused by the stamping and bending process.

[0054] After the existing middle plate rebounds and deforms, its shape accuracy decreases. When plugging into the socket on the existing end plate, the shape of the existing middle plate and the shape of the socket may not match, which causes a large gap between the part of the existing middle plate located in the socket and the hole wall of the socket. The existing middle plate and the existing end plate are usually welded by laser self-fusion. When a large gap appears in the socket, the laser can easily penetrate the gap and enter the existing battery module, which has an adverse effect on the battery cells in the existing battery module.

[0055] In order to avoid the above problems, the present application embodiment provides a battery module, such as Figure 1 , Figure 1 A three-dimensional schematic diagram of a battery module is shown. The battery module includes: two end plate assemblies 100, along a first direction (such as Figure 1 Exemplarily, the battery module further comprises two side plates 400, and the two side plates 400 and the two end plate assemblies 100 together form a circumferential frame of the battery module. A module upper cover 500 is also arranged above the circumferential frame.

[0056] like Figure 2 , Figure 2 A three-dimensional schematic diagram of a module frame of a battery module is shown. The module frame includes the above-mentioned circumferential frame and a middle plate 200, and the middle plate 200 is located in the circumferential frame. Exemplarily, the middle plate 200 can be parallel to the side plate 400.

[0057] like Figure 3 , Figure 3 An exploded schematic diagram of a battery module is shown. Exemplarily, two battery cell groups 600 may be provided in the module frame, and the battery cell groups 600 are located between the middle plate 200 and the side plate 400. Each battery cell group 600 includes a plurality of battery cells 610 arranged along a first direction. A module bar 700 (or busbar) is also provided above the battery cell group 600, and the module bar 700 has an electrode output terminal 710 (including a positive output terminal and a negative output terminal) extending outside the module frame.

[0058] like Figure 4 , Figure 4 The schematic diagram of the cross section of the module frame from top view is shown. The middle plate 200 is connected between the two end plate assemblies 100. Specifically, Figure 5 , Figure 5 Shown Figure 4 The enlarged schematic diagram of the first structure of the middle A part. The middle plate 200 includes a partition 210 and a connection part 220 distributed in a straight line along a first direction and in the same plane. The middle plate 200 is plugged and matched with the corresponding end plate assembly 100 at least through the connection part 220; at least one side of the partition 210 has a light blocking structure 300 protruding from the surface of the connection part 220.

[0059] For example, the partition portion 210 and the connection portion 220 may be located in the same vertical plane, and the plane intersects the two end plate assemblies 100 .

[0060] For example, Figure 3 , connecting parts 220 are provided at both ends of the partition part 210 along the first direction. The two connecting parts 220 are plugged and matched with the corresponding end plate assemblies 100 respectively.

[0061] For example, Figure 3 The partition 210 is located between the two battery cell groups 600 to isolate the two battery cell groups 600 .

[0062] Since the partition portion 210 and the connecting portion 220 included in the middle plate 200 are distributed in a straight line in the same plane, the middle plate 200 can be formed by stamping and cutting using a straight plate profile (such as a 5-series aluminum profile). Since the middle plate 200 formed by stamping and cutting has not been bent, it will not produce rebound deformation after forming, which can ensure that it has a high shape accuracy. After the connecting portion 220 and the end plate assembly 100 are plugged in and matched, since the shape accuracy of the connecting portion 220 of the middle plate 200 is high, the connecting portion 220 and the end plate assembly 100 can achieve a high assembly accuracy. In other words, the assembly gap 800 between the connecting portion 220 and the end plate assembly 100 is small.

[0063] During laser self-melting welding, on the one hand, it is easy to ensure that the connection portion 220 and the end plate assembly 100 are reliably connected, and on the other hand, it is not easy for the laser to pass through the small assembly gap 800 and enter the battery module. Figure 5 Taking the direction in as an example, the right side of the connecting portion 220 is the partition 210. In other words, the right side of the connecting portion 220 is close to the inside of the battery module; correspondingly, the left side of the connecting portion 220 is close to the outside of the battery module. The light-blocking structure 300 provided on the plate surface of the partition 210 is close to the inside of the battery module relative to the connecting portion 220. During welding, even if a laser passes through the assembly gap 800 from the outside of the battery module, it will be blocked by the light-blocking structure 300, which can further reduce the probability of the laser entering the interior of the battery module, and help to further improve the phenomenon that the battery cell 610 is adversely affected by the welding process.

[0064] In the battery module provided in this embodiment, the partition 210 and the connection part 220 of the middle plate 200 are arranged in a straight line in the same plane, so that the middle plate 200 can be formed by stamping and cutting, which helps to ensure that the middle plate 200 has a high shape accuracy, so as to reduce the assembly gap 800 between the middle plate 200 and the end plate assembly 100, thereby ensuring the welding quality of the middle plate 200 and the end plate assembly 100. At the same time, a light blocking structure 300 is provided on at least one side plate 400 of the partition 210. During welding, even if the laser passes through the assembly gap 800, it can be shielded by the light blocking structure 300, thereby avoiding the problem of damage to the internal components of the battery module due to laser irradiation during welding.

[0065] like Figure 5, the partition 210 includes a first plate surface 211 and a second plate surface 212 opposite to each other. The light blocking structure 300 can be arranged on the first plate surface 211. It can be understood that when assembling the middle plate 200 and the end plate assembly 100, the side of the connecting portion 220 close to the second plate surface 212 can be made to fit with the end plate assembly 100. At this time, the assembly gap 800 is located on the side of the connecting portion 220 close to the first plate surface 211, and the light blocking structure 300 on the first plate surface 211 can more reliably block the laser passing through the assembly gap 800.

[0066] like Figure 6 , Figure 6 The enlarged schematic diagram of the second structure of part A is shown. The light-blocking structure 300 can also be set on the second plate surface 212. It can be understood that when assembling the middle plate 200 and the end plate assembly 100, the side of the connecting portion 220 close to the first plate surface 211 can be made to fit with the end plate assembly 100. At this time, the assembly gap 800 is located on the side of the connecting portion 220 close to the second plate surface 212, and the light-blocking structure 300 on the second plate surface 211 can more reliably block the laser passing through the assembly gap 800.

[0067] like Figure 7 , Figure 7 The enlarged schematic diagram of the third structure of part A is shown. The first plate surface 211 and the second plate surface 212 may both be provided with a light blocking structure 300. Regardless of whether the assembly gap 800 is located on the side of the connecting portion 220 close to the first plate surface 211 or on the side of the connecting portion 220 close to the second plate surface 212, the laser passing through the assembly gap 800 can be shielded by the light blocking structure 300 on the same side.

[0068] like Figure 5 In some embodiments, the end plate assembly 100 includes an end plate body 110, and the end plate body 110 is provided with a connecting through hole 111, and the connecting through hole 111 includes a plug-in hole section 1111 and a guide hole section 1112, the connecting portion 220 is plugged into the end plate body 110 through the plug-in hole section 1111, and the partition portion 210 extends into the guide hole section 1112; the light blocking structure 300 is at least partially located in the guide hole section 1112.

[0069] For example, Figure 3 The end plate assembly 100 further includes an output pole base 120, which can be connected to the top of the end plate body 110 and is used to support the electrode output end 710 of the battery module. Generally, the output pole base 120 can be made of an insulating material (such as plastic).

[0070] It should be noted that along the thickness direction of the middle plate 200 (eg Figure 5), the size of the guide hole segment 1112 is larger than the size of the plug-in hole segment 1111, so that the guide hole segment 1112 can accommodate the light blocking structure 300.

[0071] It should also be noted that, since the connection part 220 is plugged into the plug hole section 1111, it can be understood that the cross-sectional shape and size of the plug hole section 1111 match the cross-sectional shape and size of the connection part 220. In combination with the above content, since the middle plate 200 formed by stamping and cutting has a high shape accuracy, the interference amount between the connection part 220 and the plug hole section 1111 can be designed to be 0.1 to 0.3 mm. After the connection part 220 is inserted into the plug hole section 1111, the actual assembly gap 800 formed between the two can reach a level of less than 0.2 mm.

[0072] The light blocking structure 300 is at least partially located in the guide hole section 1112, which does not occupy the internal space of the battery module, thereby at least to some extent improving the problem of crowded device arrangement caused by the reduction of the internal space of the battery module due to the provision of the light blocking structure 300.

[0073] In some embodiments, the end plate body 110 may be made of 6 series aluminum profiles, and the middle plate 200 may be made of 5 series aluminum profiles.

[0074] In combination with the above content, it can be known that the end plate body 110 and the middle plate 200 can be fixedly connected by laser self-melting welding. The applicant has found that if the end plate body 110 and the middle plate 200 are both made of 6 series aluminum profiles, welding cracks may occur when the two are laser self-melting welded, resulting in low welding reliability. However, if the end plate body 110 is made of 6 series aluminum profiles and the middle plate 200 is made of 5 series aluminum profiles, the number of welding cracks that occur when the two are laser self-melting welded can be effectively reduced, which helps to improve welding reliability.

[0075] like Figure 5 As shown, in some embodiments, a guide groove is provided at the position of the guide hole section 1112 of the end plate body 110 , and the guide groove corresponds to at least one side plate surface of the partition 210 .

[0076] Since a guide groove is provided in the guide hole section 1112, the hole wall in the guide hole section 1112 along the thickness direction of the middle plate 200 is an inclined surface. After the connecting part 220 enters the guide hole section 1112, the side wall can guide the connecting part 220, so that the connecting part 220 is aligned with the plug-in hole section 1111, so that the connecting part 220 can enter the plug-in hole section 1111 more smoothly, which helps to reduce the difficulty of assembly.

[0077] like Figure 5In some embodiments, the guide groove and the light blocking structure 300 are located on the same side of the partition 210 .

[0078] Combination Figure 5 It can be known that on the side where the guide groove is provided, the gap between the hole wall of the guide hole section 1112 and the plate surface of the partition 210 is larger; during welding, the probability of the laser passing through the connecting through hole 111 from this side is higher. On the side where the guide groove is not provided, the hole wall of the guide hole section 1112 can fit the plate surface of the partition 210; during welding, the probability of the laser passing through the connecting through hole 111 from this side is lower. Therefore, by providing the light-blocking structure 300 at the guide groove, the light-blocking structure 300 can more reliably block the laser passing through the connecting through hole 111. At the same time, it can also avoid the interference between the light-blocking structure 300 and the hole wall of the guide hole section 1112, which hinders the connection part 220 from being inserted into the plug-in hole section 1111. Ensuring that the depth of the connection part 220 inserted into the plug-in hole section 1111 meets the process requirements helps to ensure the welding quality.

[0079] Regarding the specific formation method of the light blocking structure 300, as shown in FIG. Figure 7 In some embodiments, the light blocking structure 300 includes a light blocking sheet, which is fixed on the plate surface of the partition 210 .

[0080] Exemplarily, the light blocking sheet may be an aluminum sheet.

[0081] Exemplarily, the light shielding sheet may be connected to the partition 210 by welding, plugging, bonding, or fastener connection.

[0082] The light blocking structure 300 is formed on the plate surface of the partition 210 by connecting the light blocking sheet to the partition 210 of the middle plate 200. In this way, the thickness of the connecting portion 220 and the partition 210 of the middle plate 200 can be the same. The position of the light blocking structure 300 on the partition 210 can be flexibly adjusted according to the actual situation at the assembly site, so that the light blocking structure 300 can more reliably block the laser passing through the plug hole section 1111.

[0083] In addition to being formed in the above manner, the light blocking structure 300 can also be realized by forming a thickness difference between the connecting portion 220 and the partitioning portion 210. Specifically, Figure 8 , Figure 8 Shown Figure 4 An enlarged schematic diagram of the fourth structure of the portion A in the middle. In some embodiments, in the partition 210, at least the thickness of the portion adjacent to the connection portion 220 is greater than the thickness of the connection portion 220 to form a step surface, and the light shielding structure 300 includes the step surface.

[0084] Exemplarily, the thickness of the partition 210 is uniform; or, in the partition 210 , the thickness of a portion adjacent to the connection portion 220 is greater than the thickness of other portions.

[0085] For example, the thickness of the connecting portion 220 may be reduced by thinning the connecting portion 220 to form a stepped surface.

[0086] like Figure 8 The size and thickness of the plug-in hole section 1111 match the size of the connecting portion 220. Therefore, when the laser passes through the plug-in hole section 1111, it will be blocked by the step surface between the connecting portion 220 and the partition portion 210 to prevent the laser from entering the interior of the battery module.

[0087] By forming a step surface between the connecting portion 220 and the partition 210 to form the light shielding structure 300, it is possible to save the process of adding structural parts to the partition 210. In other words, when the middle plate 200 is formed, the light shielding structure 300 has been formed, which helps to simplify the assembly process of the battery module and reduce the difficulty of assembly.

[0088] like Figure 8 , the step surface may be formed only on the second plate surface 212 of the partition 210 .

[0089] like Fig. 9 , Fig. 9 Shown Figure 4 FIG. 1 is an enlarged schematic diagram of the fifth structure of part A. The step surface may be formed only on the first plate surface 211 of the partition 210 .

[0090] like Fig.10 , Fig.10 Shown Figure 4 The enlarged schematic diagram of the sixth structure of the portion A in the figure. The first plate surface 211 and the second plate surface 212 of the partition 210 may be formed with step surfaces at the same time.

[0091] It should be noted that the light blocking structure 300 may include a light blocking sheet; or the light blocking structure 300 may include a step surface; or the light blocking structure 300 may include both a light blocking sheet and a step surface.

[0092] The applicant has found that when the opening size of the connecting through hole 111 is close to the cross-sectional size of the connecting portion 220 , it will be difficult for the connecting portion 220 to align with the opening of the connecting through hole 111 , making it difficult to plug and match the middle plate 200 with the end plate body 110 .

[0093] In order to solve the above problems, Fig.11 , Fig.11 Another perspective schematic diagram of the battery module is shown. In some embodiments, the end plate body 110 includes a second direction (such as Fig.11The first sub-board body 112 and the second sub-board body 113 are independently distributed in a straight line (in the Y direction), the first sub-board body 112 and the second sub-board body 113 are fixedly connected, and a plug-in space 114 is defined between the first sub-board body 112 and the second sub-board body 113. The connecting portion 220 is plugged and matched with the end plate body 110 through the plug-in space 114; the second direction intersects with the first direction.

[0094] Exemplarily, the first sub-board body 112 and the second sub-board body 113 can be directly connected, that is, the first sub-board body 112 and the second sub-board body 113 are directly contacted and connected; or, the first sub-board body 112 and the second sub-board body 113 can also be indirectly connected, that is, the first sub-board body 112 and the second sub-board body 113 are connected through other structural parts, for example, indirectly connected through the middle plate 200.

[0095] Exemplarily, the second direction is perpendicular to the first direction.

[0096] like Fig.12 , Fig.12 The three-dimensional schematic diagram of the module frame of the battery module of this embodiment is shown. The first sub-board body 112 and the second sub-board body 113 are spliced ​​to form the end plate body 110 of the straight plate structure. The first sub-board body 112 is connected to one of the side plates 400 of the battery module, and the second sub-board body 113 is connected to the other side plate 400 of the battery module.

[0097] like Fig.13 , Fig.13 The exploded schematic diagram of the battery module of this embodiment is shown. When the middle plate 200 and the end plate body 110 are assembled, the first sub-plate body 112 and the second sub-plate body 113 can be firstly arranged along the second direction (such as Fig.13 The middle plate 200 is connected to the first sub-plate body 112 and the second sub-plate body 113 to maintain a large spacing distance, and a part of the connecting portion 220 of the middle plate 200 is inserted into the gap between the first sub-plate body 112 and the second sub-plate body 113, and the part of the connecting portion 220 can be aligned with the insertion space 114 between the first sub-plate body 112 and the second sub-plate body 113. Afterwards, the first sub-plate body 112 and the second sub-plate body 113 are moved closer to each other along the second direction until the insertion space 114 is defined between the two; at this time, at least a part of the connecting portion 220 is located in the insertion space 114. Finally, the connecting portion 220 of the middle plate 200 is welded to the first sub-plate body 112 and the second sub-plate body 113 respectively, and it is ensured that the insertion depth meets the process requirements.

[0098] In this embodiment, since the first sub-board body 112 and the second sub-board body 113 are independent structures before being fixedly connected, the spacing between the first sub-board body 112 and the second sub-board body 113 can be temporarily increased to facilitate the insertion of the connecting portion 220 of the middle plate 200 therebetween. Afterwards, the first sub-board body 112 and the second sub-board body 113 are fixedly connected to form the end plate body 110, and the plug-in fit between the end plate body 110 and the middle plate 200 can be completed.

[0099] For the structure of the plug-in space 114, specifically, Fig.14 , Fig.14 A schematic diagram of a first structure of the plug-in space 114 is shown. In some embodiments, the side walls of the first sub-board body 112 and the second sub-board body 113 that are close to each other are spaced apart as a whole to define a gap extending from the upper end to the lower end of the end plate body 110 between the first sub-board body 112 and the second sub-board body 113, and the gap is configured as the plug-in space 114.

[0100] Exemplarily, the surfaces of the side walls of the first sub-board body 112 and the second sub-board body 113 that are close to each other may be planes.

[0101] Exemplarily, the first sub-board body 112 and / or the second sub-board body 113 may be attached to the board surface of the connecting portion 220 .

[0102] Exemplarily, the first sub-board body 112 and the second sub-board body 113 may be fixedly connected via the connecting portion 220 , that is, the first sub-board body 112 and the second sub-board body 113 are fixedly connected to the connecting portion 220 , respectively.

[0103] In this embodiment, since the gap extends from the upper end to the lower end of the end plate body 110, that is, the size of the plug-in space 114 along the vertical direction is large, the connecting portion 220 of the middle plate 200 can be more easily inserted into the plug-in space 114. At the same time, the first sub-plate body 112 and the second sub-plate body 113 can be simultaneously attached to the plate surface of the connecting portion 220, which helps to further reduce the assembly gap 800 and improve the welding quality.

[0104] The plug-in space 114 may also have other structures besides the above structures. Fig.15 , Fig.15 A schematic diagram showing a second structure of the plug-in space 114 is shown. In some embodiments, the middle portions of the adjacent side walls of the first sub-board body 112 and the second sub-board body 113 are spaced apart to define a through hole between the first sub-board body 112 and the second sub-board body 113 , and the through hole is configured as the plug-in space 114 .

[0105] Exemplarily, at least one of the side walls of the first sub-board body 112 and the second sub-board body 113 that are close to each other is provided with a groove on the surface, and the groove can be used to define a through hole.

[0106] Exemplarily, the first sub-board body 112 and the second sub-board body 113 may be directly contacted and connected.

[0107] according to Fig.15 The structure and direction of the display are further explained, the side walls of the first sub-plate body 112 and the second sub-plate body 113 close to each other can directly contact each other at the position close to the upper end and the lower end, and the through hole is formed between the upper end and the lower end. When the connecting part 220 is inserted between the first sub-plate body 112 and the second sub-plate body 113, the connecting part 220 can be more easily positioned in the vertical direction through the limitation of the through hole, further ensuring that the relative position between the middle plate 200 and the end plate body 110 in the vertical direction can meet the process requirements.

[0108] In combination with the above content, if laser self-melting welding is used between the end plate body 110 and the middle plate 200, then in order to improve the welding quality, it is necessary to limit the materials of the end plate body 110 and the middle plate 200. However, the applicant has found that if laser wire welding is used, then even if the end plate body 110 and the middle plate 200 are both made of 6 series aluminum profiles, a high welding quality can be achieved.

[0109] like Fig.16 , Fig.16 The top view of another structure of the battery module is shown. The overall relative position between the middle plate 200 and the end plate body 110 remains unchanged. In order to improve the welding quality of the laser wire welding, it is necessary to increase the contact area between the connecting portion 220 and the end plate body 110. Specifically, Fig.17 , Fig.17 Shown Fig.16 The enlarged schematic diagram of the portion B before laser wire welding. In some embodiments, the partition 210 is located outside the insertion space 114 .

[0110] In this embodiment, along the second direction, the overlapping parts of the middle plate 200 and the end plate body 110 are all connecting parts 220, so that after the middle plate 200 and the end plate body 110 are plugged in, the length of the part with a smaller gap between the two is longer, which can further reduce the probability of the laser passing through the plug-in space 114, and help to ensure the welding quality between the middle plate 200 and the end plate body 110.

[0111] Exemplarily, the light-shielding structure 300 on the plate surface of the partition 210 is located outside the plug-in space 114 and close to the end plate body 110. The light-shielding structure 300 close to the end plate body 110 can shorten the propagation distance of the laser passing through the plug-in space 114 inside the battery module, further reduce the risk of the laser passing through the plug-in space 114 causing adverse effects on the devices inside the battery module, and improve the reliability of the light-shielding structure 300 shielding the plug-in space 114.

[0112] like Fig.17 In some embodiments, along the first direction, the connection portion 220 is inserted into the insertion space 114 through an opening on one side of the insertion space 114 , and in the insertion space 114 , a welding space 900 is formed between an end of the connection portion 220 and an opening on the other side of the insertion space 114 .

[0113] Exemplarily, along the first direction, the length of the connecting portion 220 is smaller than the thickness of the end plate body 110 .

[0114] by Fig.17 Taking the direction in as an example, the connecting part 220 is inserted into the plug-in space 114 through the opening on the right side of the plug-in space 114, and a welding space 900 is formed between the end of the connecting part 220 and the left side opening of the plug-in space 114, that is, the first sub-board body 112, the second sub-board body 113 and the end of the connecting part 220 form the welding space 900, and the opening of the welding space 900 faces the left side, that is, the outside of the battery module.

[0115] like Fig.18 , Fig.18 Shown Fig.16 The enlarged schematic diagram of the portion B after laser wire welding. During welding, the welding wire (e.g., 5 series aluminum welding wire) enters the welding space 900 and is melted by laser irradiation to form a welding fixing portion 1000, so as to achieve a fixed connection between the first sub-plate body 112, the second sub-plate body 113 and the connecting portion 220.

[0116] like Fig.19 , Fig.19 Shown Fig.16 FIG. 1 is an enlarged schematic diagram of another structure of part B. In some embodiments, the first sub-plate 112 is located at the welding space 900 and / or the second sub-plate 113 is located at the welding space 900 and is provided with a welding groove 910 .

[0117] Providing the welding groove 910 can increase the opening size of the welding space 900, making it easier for the welding wire to enter the welding space 900, and helping to form a more reliable welding fixing portion 1000 to ensure welding quality.

[0118] 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.

[0119] A battery pack includes the battery modules according to the above embodiments.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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: Two end plate assemblies are spaced apart along a first direction; A middle plate is connected between the two end plate assemblies, and the middle plate includes a partition portion and a connection portion which are linearly distributed along a first direction and in the same plane, and the middle plate is plugged and matched with the corresponding end plate assembly at least through the connection portion; at least one side surface of the partition portion has a light-blocking structure protruding from the surface of the connection portion.

2. The battery module according to claim 1, characterized in that: The end plate assembly comprises an end plate body, the end plate body is provided with a connecting through hole, the connecting through hole comprises a plug hole section and a guide hole section, the connecting portion is plugged and matched with the end plate body through the plug hole section, and the partition extends into the guide hole section; The light blocking structure is at least partially located in the guide hole segment.

3. The battery module according to claim 2, characterized in that: The end plate body is provided with a guide groove at a position located at the guide hole section, and the guide groove at least corresponds to a side plate surface of the partition.

4. The battery module according to claim 3, characterized in that: The guide groove and the light blocking structure are located on the same side of the partition.

5. The battery module according to claim 2, characterized in that: The end plate body includes a first sub-plate body and a second sub-plate body that are independent and linearly spaced apart along a second direction, the first sub-plate body and the second sub-plate body are fixedly connected, an insertion space is defined between the first sub-plate body and the second sub-plate body, and the connecting portion is plugged into and matched with the end plate body through the insertion space; the second direction intersects with the first direction.

6. The battery module according to claim 5, characterized in that: The side walls of the first sub-board body and the second sub-board body that are close to each other are spaced apart as a whole to define a gap extending from the upper end to the lower end of the end plate body between the first sub-board body and the second sub-board body, and the gap is configured as the insertion space.

7. The battery module according to claim 5, characterized in that: The middle parts of the mutually adjacent side walls of the first sub-board body and the second sub-board body are spaced apart to define a through hole between the first sub-board body and the second sub-board body, and the through hole is configured as the plug-in space.

8. The battery module according to claim 5, characterized in that: The partition is located outside the insertion space.

9. The battery module according to claim 5, characterized in that: Along the first direction, the connection portion is inserted into the insertion space through one side opening of the insertion space, and in the insertion space, a welding space is formed between an end of the connection portion and the other side opening of the insertion space.

10. The battery module according to claim 9, characterized in that: A welding groove is provided at a position where the first sub-plate is located in the welding space and / or a position where the second sub-plate is located in the welding space.

11. The battery module according to claim 1, characterized in that: The light blocking structure comprises a light blocking sheet, and the light blocking sheet is fixed on the plate surface of the partition.

12. The battery module according to claim 1, characterized in that: In the partition portion, at least a portion adjacent to the connection portion has a thickness greater than a thickness of the connection portion to form a step surface, and the light blocking structure includes the step surface.

13. A battery pack, characterized in that: Comprising a battery module as claimed in any one of claims 1 to 12.

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