Battery module and battery pack

Abstract

The utility model discloses a battery module and a battery pack, the battery module is installed in the shell of the battery pack, the battery module comprises a battery cell assembly, a positive electrode lead wire electricity connecting end, a negative electrode lead wire electricity connecting end, a constraint frame body and a fixing assembly, the battery cell assembly comprises a battery cell, a positive electrode electricity connecting piece and a negative electrode electricity connecting piece, the battery cell comprises a positive output end and a negative output end, the positive electricity connecting piece is electrically connected with the positive output end, and the negative electricity connecting piece is electrically connected with the negative output end; the anode lead wire electricity connection end is electrically connected with the anode output end and is correspondingly connected with the anode electricity connection sheet; the negative electrode lead power connection end is electrically connected with the negative electrode output end and is correspondingly connected with the negative electrode power connection sheet; the restraint frame body is arranged on the peripheral side of the battery cell in a surrounding manner and comprises a first restraint side wall; the fixing assembly comprises a first fixing piece and a connecting metal plate. The connecting metal plate comprises a first connecting part and a second connecting part which are connected in a bent mode. The first connecting part is provided with a first kidney-shaped hole, and the first fixing piece penetrates through the first kidney-shaped hole.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery module and a battery pack. Background Technology

[0002] A battery pack is a battery system that combines multiple battery cells in series, parallel, or series-parallel configurations to meet specific voltage and capacity requirements. In real life, battery packs are widely used in electric vehicles, mobile devices, home energy storage systems, and other fields to provide these devices with long-lasting and stable power support, and are an important component of modern energy solutions.

[0003] However, in the existing battery pack assembly process, the positive and negative leads need to be soldered to the corresponding positive and negative lead-out connectors. The dimensions of the wires connected to the positive and negative leads need to be precisely matched to the positions of the positive and negative leads and the lead-out connectors. Otherwise, the wires may be pulled, resulting in poor contact between the leads and the cells, or the wires may be squeezed, causing the leads to move and affecting the contact area between the leads and the lead-out connectors, which will have an adverse effect on the battery pack's discharge performance. Utility Model Content

[0004] In view of this, this application provides a battery module and a battery pack. The battery module is installed in the outer shell of the battery pack. The connecting sheet metal in the battery module has a first waist hole, so that the connecting sheet metal has a certain position adjustment capability when installed on the constraint frame. The connecting sheet metal can adjust its position relative to the constraint frame according to the position of the positive and negative lead connection terminals and the positive and negative lead connection pieces, which greatly reduces the degree of pulling of the wire harness connected to the positive and negative lead connection terminals, thereby solving the above-mentioned technical problems.

[0005] The first aspect of this application provides a battery module, which includes a cell assembly, a positive electrode lead connection terminal, a negative electrode lead connection terminal, a constraint frame, and a fixing component. The cell assembly includes a cell, a positive electrode connecting piece, and a negative electrode connecting piece. The cell includes a positive electrode output terminal and a negative electrode output terminal. The positive electrode connecting piece is electrically connected to the positive electrode output terminal, and the negative electrode connecting piece is electrically connected to the negative electrode output terminal. The positive electrode lead connection terminal is electrically connected to the positive electrode output terminal and correspondingly connected to the positive electrode connecting piece. The negative electrode lead connection terminal is electrically connected to the negative electrode connecting piece. The battery module has a positive terminal and a corresponding negative terminal connecting piece; a constraint frame surrounds the periphery of the battery cell, and the constraint frame includes a first constraint sidewall; the fixing assembly includes a first fixing member and a connecting sheet metal, and the connecting sheet metal includes a first connecting part and a second connecting part that are bent and connected; the first connecting part has a first waist hole that extends along the height direction of the battery module, and the first fixing member passes through the first waist hole to connect the first connecting part to the first constraint sidewall, and the positive terminal connecting piece and the negative terminal connecting piece are disposed on the second connecting part.

[0006] The design of the first waist hole in the sheet metal can absorb dimensional errors generated during battery pack assembly and processing to a certain extent. This effectively avoids deformation and relative stress between the lead wire terminals and the connecting pieces when connecting them. In this way, the electrical connection between the connecting pieces, lead wire terminals, and battery cells is guaranteed, as well as the flatness between the contact surfaces of the connecting pieces and lead wire terminals. This prevents an increase in the internal resistance of the battery module due to the reduction or deformation of the contact area between the two. The internal resistance of the battery module will not increase due to the reduction of the contact area between the two, allowing the battery pack to achieve excellent discharge performance.

[0007] A second aspect of this application provides a battery pack, which includes a housing and a battery module mentioned in the first aspect of this application, wherein the housing includes a receiving cavity and the battery module is located in the receiving cavity.

[0008] Since the main beneficial effects of the second aspect are derived from the beneficial effects of the first aspect, please refer to the beneficial effects of the first aspect for details of the beneficial effects of the second aspect, and will not be repeated here. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of an overall structure of the battery pack in this application;

[0011] Figure 2 for Figure 1 Exploded view of the battery pack;

[0012] Figure 3 for Figure 2 Further exploded view of the battery pack;

[0013] Figure 4 for Figure 3 An exploded view of the structure from another perspective;

[0014] Figure 5 for Figure 2 A diagram illustrating the independent structure of the battery module in its assembled state;

[0015] Figure 6 for Figure 5 Independent structural diagrams of the central fixing component, the first connecting plate, and related structures in the assembled state;

[0016] Figure 7 for Figure 5 Independent structural diagrams of the central constraint frame and related structures in the assembled state;

[0017] Figure 8 for Figure 7 A diagram illustrating the independent structure of the connecting sheet metal.

[0018] Figure 9 for Figure 7 A schematic diagram of the independent structure of the second connecting plate in the middle;

[0019] Figure 10 for Figure 7 A schematic diagram of the independent structure of the first connecting plate.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1000 - Battery pack, 1 - Battery module, 100 - Cell assembly, 120 - Positive electrode connecting piece, 130 - Negative electrode connecting piece, 140 - Connecting wire, 200 - Positive lead connecting terminal, 300 - Negative lead connecting terminal, 400 - Constraint frame, 410 - First connecting plate, 411 - First constraint sidewall, 412 - Second waist hole, 413 - First connecting main board, 414 - First support edge, 415 - First abutting protrusion, 416 - Mounting connection part, 420 - Second connecting plate, 421 - Second constraint sidewall, 422 - Second connecting wire Connect to motherboard, 424-connection slot, 425-second abutment protrusion, 426-through hole, 500-fixing component, 510-first fixing component, 520-connecting sheet metal, 521-first connecting part, 5211-first waist hole, 522-second connecting part, 530-second fixing component, 540-third fixing component, 550-positive electrode insulating component, 560-negative electrode insulating component, 600-fourth fixing component, 700-protection plate, 800-insulating isolation component, 2-outer shell, 21-receiving cavity, 22-covering part, 23-main shell part, 3-pad layer;

[0022] X - length direction, Y - width direction, Z - height direction. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0024] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains. The terms “an,” “a,” or “the,” as used herein, do not indicate a limitation of quantity, but are merely used to indicate the presence of at least one. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] The following will refer to the appendices in the embodiments of this application. Figures 1-10 The technical solutions in the embodiments of this application are clearly and completely described. It should be noted that the length direction X, width direction Y and height direction Z marked in each figure are all marked with reference to the length direction X, width direction Y and height direction Z of the battery pack 1000 (or battery module 1). The directions of each figure are kept consistent to facilitate the reader's reference and understanding.

[0027] Please refer to this first. Figure 1 and Figure 2 This application provides a battery pack 1000, which includes a housing 2 and a battery module 1. The housing 2 includes a receiving cavity 21, and the battery module 1 is located in the receiving cavity 21. Figure 2 As can be seen, in some embodiments, the outer shell 2 includes a cover portion 22 and a main shell portion 23. The main shell portion 23 forms a receiving cavity 21. After the cover portion 22 covers and connects to the main shell portion 23, the cover portion 22 makes the receiving cavity 21 independent of the external space of the main shell portion 23, so that the battery module 1 placed inside the receiving cavity 21 can be covered by the outer shell 2. Thus, the outer shell 2 protects the battery module 1 and reduces the damage of the external environment to the battery module 1.

[0028] For reference Figures 2 to 4In some embodiments, the battery pack 1000 further includes a padding layer 3, which is sandwiched between the constraint frame 400 and the outer shell 2. The padding layer 3 can be made of materials with cushioning properties such as foam cotton, elastic adhesive layer, and sponge. In this way, when the outer shell 2 of the battery pack 1000 is impacted, the padding layer 3 can absorb part or all of the impact force, greatly reducing the impact force on the battery module 1, ensuring the structural stability of the battery module 1, and maintaining the performance of the battery module 1 to a certain extent.

[0029] Please continue to refer to this. Figure 2 , Figure 3 and Figure 6 In some embodiments, the battery module 1 includes a cell assembly 100, a positive electrode lead connection terminal 200, a negative electrode lead connection terminal 300, a constraint frame 400, and a fixing assembly 500. The cell assembly 100 includes a cell, a positive electrode connecting piece 120, and a negative electrode connecting piece 130. The cell includes a positive electrode output terminal (not shown) and a negative electrode output terminal (not shown). The positive electrode connecting piece 120 is electrically connected to the positive electrode output terminal (not shown), and the negative electrode connecting piece 130 is electrically connected to... The negative output terminal (not shown in the figure) is connected; the positive lead connection terminal 200 is electrically connected to the positive output terminal (not shown in the figure) and correspondingly connected to the positive connecting piece 120; the negative lead connection terminal 300 is electrically connected to the negative output terminal (not shown in the figure) and correspondingly connected to the negative connecting piece 130; the constraint frame 400 surrounds the periphery of the battery cell, and the constraint frame 400 includes a first constraint sidewall 411; the fixing component 500 includes a first fixing member 510 and a connecting sheet metal 520, such as... Figure 8 As shown, the connecting sheet metal 520 includes a first connecting part 521 and a second connecting part 522 that are bent and connected; the first connecting part 521 has a first waist hole 5211, which extends along the height direction Z of the battery module 1, and the first fixing member 510 passes through the first waist hole 5211 to connect the first connecting part 521 to the first constraint sidewall 411. The positive electrode connecting piece and the negative electrode connecting piece 130 are disposed on the second connecting part 522.

[0030] First, it's important to understand that the cell assembly 100 provides the electrical energy required for the battery pack 1000 to operate. The positive output terminal (not shown in the figure) of the cell assembly 100 is electrically connected to the negative terminal connector 130. Then, the positive lead connection terminal 200 of the battery module 1 is electrically connected to the positive terminal connector 120, and the negative lead connection terminal 300 is electrically connected to the negative terminal connector 130. Thus, by correspondingly connecting the positive lead connection terminal 200 and the negative lead connection terminal 300, the battery pack 1000 can be connected to the electrical device. It provides the electrical energy required for the operation of electrical equipment. Generally, the position of the connecting piece and the lead wire connection terminal in the height direction Z of the battery module 1 is not limited, as long as the lead wire connection terminal is electrically connected to the cell assembly 100 through the connecting piece. In addition, in order to reduce the limiting effect of the wiring port of the battery pack 1000 (i.e. the plug-in port of the electrical equipment connector) on the position of the lead wire connection terminal and the connecting piece in the battery module 1, the lead wire connection terminal and the wiring port are usually connected to the connecting wire 140. The current through the connecting piece and the lead wire connection terminal can be transmitted to the electrical equipment through the connecting wire 140.

[0031] In other embodiments, the constraint frame 400 is used to enclose the battery cell assembly 100, forming a circumferential constraint on the battery cell assembly 100, thereby ensuring that the individual battery cells in the battery cell assembly 100 do not separate and ensuring the integrity of the battery cell assembly 100 in the receiving cavity 21; the connecting sheet metal 520 is connected to the constraint frame 400 through the first fastener 510, thereby forming an effective surface required for connecting and fixing the connecting piece and the lead wire connecting end, so as to form a constraint effect on the lead wire connecting end and the connecting piece, and prevent the lead wire connecting end and the connecting piece from moving freely in the receiving cavity 21. The connecting sheet metal 520 includes a first connecting part 521 and a second connecting part 522 that are connected together. The first connecting part 521 is used to connect to the first constraint sidewall 411 so that the connecting sheet metal 520 can be fixedly connected to the constraint frame 400. The second connecting part 522 is used to form an effective surface for connecting the connecting piece and the lead wire connecting end.

[0032] In existing battery pack 1000 products, to ensure stable connection of the connecting pieces and lead wire terminals, they are typically fixed to the constraint frame 400. This keeps their positions within the receiving cavity 21 fixed, reducing the risk of electrical conduction between the connecting pieces / lead wire terminals and other metal components due to significant movement, or poor contact caused by loosening, which could affect the discharge performance of the battery pack 1000. However, during actual manufacturing, the connecting pieces / lead wire terminals may shift slightly from their intended connection positions due to heat fusion during welding, increasing the distance between the lead wire terminals and the battery pack 1000 wiring ports. Furthermore, if the length of the connecting wire 140 is insufficient to fill the distance caused by the increased spacing, the connecting wire 140 used to connect the lead wire connection terminal and the battery pack 1000 terminal will be stretched due to the increased spacing. On the one hand, the lead wire connection terminal will be stretched, causing relative movement between the lead wire connection terminal and the connecting piece, which may reduce the contact area between the lead wire connection terminal and the connecting piece, resulting in an increase in the internal resistance of the battery pack 1000. On the other hand, after the connecting wire 140 is stretched and forced to lengthen, the connection strength between the connecting wire 140 and the battery pack 1000 terminal and the lead wire connection terminal will decrease, resulting in poor contact between the lead wire connection terminal and the battery pack 1000 terminal, which seriously affects the discharge effect of the battery pack 1000.

[0033] It should also be understood that the length of the connecting wire 140 should not be too long. If the length of the connecting wire 140 is too long, the total volume of the assembled battery module 1 may be greater than the volume of the receiving cavity 21 due to the connecting wire 140. The connecting wire 140 may protrude from the outside of the main shell 23. During the assembly of the battery pack 1000, when the cover 22 is closed on the main shell 23, the connecting wire 140 may be squeezed and moved into the receiving cavity 21 by the cover 22. The connecting wire 140 may move in conjunction with the lead wire connection terminal, which may also cause the lead wire connection terminal to move relative to the connecting piece, resulting in a reduction in the contact area between the two. Therefore, the connecting wire 140 needs to be of moderate length, neither too long nor too short.

[0034] In the above embodiments, specifically, due to the bending connection of the first connecting portion 521 and the second connecting portion 522 in the connecting sheet metal 520, after the connecting sheet metal 520 is connected to the constraint frame 400, the first connecting portion 521 will not interfere with other components connected to the second connecting portion 522. The first connecting portion 521 in the connecting sheet metal 520 forms an action platform, allowing the connecting piece and lead wire connection end to connect to the action surface of the connection platform to constrain the position of the connecting piece and lead wire connection end in the receiving cavity 21. The second connecting portion 522 forms a connection platform, enabling the connecting sheet metal 520 to be fixed to the constraint frame 400, thereby achieving the effect of fixing the connecting piece and lead wire connection end to the constraint frame 400.

[0035] Since the first connecting part 521 is provided with a first waist hole 5211 extending along the height direction Z of the battery module 1, when the first fixing member 510 passes through the first waist hole 5211 to connect the constraint frame 400 and the connecting sheet metal 520, the position of the first fixing member 510 relative to the first waist hole 5211 can be adjusted to adjust the distance between the connecting piece and the lead wire connecting end connected to the second connecting part 522 and the surface of the battery module 1. Thus, the distance between the lead wire connecting end and the wiring port of the battery pack 1000 is adjusted, which can reduce or offset the pulling amplitude of the connecting line 140 and reduce the relative movement of the connecting piece and the lead wire connecting end due to the pulling of the connecting line 140. Thus, the contact area between the connecting piece and the lead wire connecting end is guaranteed.

[0036] In summary, the design of the first waist hole 5211 in the connecting sheet metal 520 can absorb dimensional errors generated during the assembly and processing of the battery pack 1000 to a certain extent. This effectively avoids deformation and relative stress between the lead wire connection terminal and the connecting piece when connecting them. Thus, it ensures the electrical connection effect between the connecting piece, the lead wire connection terminal and the battery cell, and also ensures the flatness between the contact surfaces of the connecting piece and the lead wire connection terminal. This prevents the internal resistance of the battery module 1 from increasing due to the reduction or deformation of the contact area between the two. The internal resistance of the battery module 1 will not increase due to the reduction of the contact area between the two, allowing the battery pack 1000 to achieve excellent discharge performance.

[0037] It should also be noted that, in the above embodiments, although the connecting sheet metal 520 needs to be fixed to the constraint frame 400, the fixing effect between the connecting sheet metal 520 and the constraint frame 400 can be permanent or immediate. Specifically, if the first fixing member 510 is a screw, the fixing effect between the connecting sheet metal 520 and the constraint frame 400 can be released by disassembling the first fixing member 510. In some embodiments, the connecting sheet metal 520 and the constraint frame 400 are connected by welding, so the fixing effect between the connecting sheet metal 520 and the constraint frame 400 can be permanent. However, it should be understood that when the first fixing member 510 is used to connect the constraint frame 400 and the connecting sheet metal 520, the position of the first fixing member 510 relative to the first waist hole 5211 can be adjusted to reduce the tensile force on the connecting line 140, and then the relevant connection work can be carried out.

[0038] For reference Figure 3 and Figure 4 In some embodiments, the connecting piece is bent, with part of the connecting piece connected to the cell assembly 100 and part extending out of the space occupied by the cell assembly 100. Along the height direction Z of the battery module 1, the part connecting to the cell assembly 100 and the part extending out of the space occupied by the cell assembly 100 are offset. The connecting piece is bent to create a height difference between the two parts. Thus, when the battery module 1 is vibrated, the connecting piece extending out of the cell assembly 100 can move freely a certain distance relative to the connecting piece connected to the cell assembly 100. Therefore, the connecting piece connected to the cell assembly 100 will not be pulled away from the battery module 1, ensuring the electrical connection between the cell assembly 100 and the connecting piece.

[0039] Please refer to Figures 3 to 6 In some embodiments, the fixing component 500 further includes a plurality of second fixing members 530, a plurality of third fixing members 540, a positive electrode insulator 550 and a negative electrode insulator 560, and the second connecting portion 522 has a first connecting position and a second connecting position, with the positive electrode insulator 550 disposed at the first connecting position and the negative electrode insulator 560 disposed at the second connecting position.

[0040] One end of the positive electrode insulating member 550 is connected to the positive electrode connecting piece 120 through the second fixing member 530 and the positive electrode lead connecting terminal 200, and the other end is connected to the second connecting part 522 through the third fixing member 540. One end of the negative electrode insulating member 560 is connected to the negative electrode connecting piece 130 through the second fixing member 530 and the negative electrode lead connecting terminal 300, and the other end is connected to the second connecting part 522 through the third fixing member 540. The second fixing member 530 and the third fixing member 540 are spaced apart.

[0041] It should be understood that since the connecting sheet metal 520 is a metal part, in order to avoid internal short circuits in the battery module 1, the positive electrode connecting piece 120 and the negative electrode connecting piece 130 should be insulated from each other. Therefore, the setting of the positive electrode insulator 550 and the negative electrode insulator 560 can meet this requirement and ensure the discharge performance of the battery module 1.

[0042] Specifically, in the above embodiments, an insulating component is sandwiched between the connecting sheet metal 520 and its corresponding connecting piece to insulate the connecting piece from the connecting sheet metal 520, thereby achieving an insulated connection between the connecting piece and the connecting sheet metal.

[0043] Furthermore, the positive electrode insulator 550 and the negative electrode insulator 560 can be elastic components, plastic components, etc. When the positive electrode insulator 550 and the negative electrode insulator 560 are elastic components, if the length of the connecting wire 140 is too long, the insulation component can be compressed to increase the distance between the lead wire connection terminal and the battery pack 1000 connection port, so that the insulation component can absorb a certain amount of excess length of the connecting wire 140 to a certain extent.

[0044] In some other embodiments, an insulating structural component can be used instead of the connecting sheet metal 520. In this way, it is not necessary to set the above-mentioned positive electrode insulating component 550 and negative electrode insulating component 560, and the insulating connection between the positive electrode connecting piece 120 and the negative electrode connecting piece 130 can also be achieved.

[0045] In some embodiments, the constraint frame 400 may also be configured as an insulating material to prevent the current output from the cell assembly 100 from flowing to the outer casing 2, thereby preventing leakage of the battery pack 1000.

[0046] Please refer to this as well. Figure 6 , Figure 7 and Figure 9 In some embodiments, the constraint frame 400 includes a first connecting plate 410 and a second connecting plate 420 connected adjacent to each other, and a first constraint sidewall 411 is formed on the first connecting plate 410; the first connecting plate 410 has a second waist hole 412, which extends along the width direction Y of the battery module 1; the battery module 1 also includes a fourth fixing member 600, which connects the first connecting plate 410 and the second connecting plate 420 through the second waist hole 412.

[0047] The second waist hole 412 allows for a certain degree of relative movement between the first connecting plate 410 and the second connecting plate 420. Thus, when assembling the constraint frame 400, the relative position of the fourth fixing member 600 in the second waist hole 412 can be adjusted to change the internal space of the constraint frame 400. In this way, when there is a certain difference between the internal space and the volume of the battery cell assembly 100, the second waist hole 412 can absorb this difference, allowing the constraint frame 400 to fit the battery cell assembly 100.

[0048] In addition, when the battery module 1 is in operation, the cell assembly 100 may expand due to heat. Therefore, the connection strength between the first connecting plate 410 and the second connecting plate 420 can be adjusted by adjusting the fourth fixing member 600. When the cell assembly 100 expands due to heat, the first connecting plate 410 and the second connecting plate 420 can move relative to each other to absorb the excess volume brought out by the expansion of the cell.

[0049] Please continue to refer to this. Figure 9 In some embodiments, the first connecting plate 410 includes a first connecting main board 413 and a first supporting edge 414. The first supporting edge 414 is bent and connected to the end of the first connecting main board 413, and the first supporting edge 414 extends along the length direction X of the battery module 1. The first connecting main board 413 is located on the periphery of the battery module 1, and the first supporting edge 414 is located on the bottom or top side of the battery module 1. Thus, the first supporting edge 414 can provide a certain support to the bottom of the cell assembly 100, thereby further enhancing the constraint effect of the constraint frame 400 on the cell assembly 100. In this way, when the battery module 1 is transported separately, the integrity of the battery module 1 can be better guaranteed, and the cell assembly 100 will not detach from the bottom of the constraint frame 400 due to gravity. Moreover, when the battery pack 1000 is bumped, the cell assembly 100 is less likely to detach from the constraint frame 400.

[0050] In some embodiments, to avoid interference between the first support edge 414 and the connection between the cell assembly 100 and the connecting piece, the first connecting motherboard 413 does not provide the first support edge 414 on the top of the cell assembly 100. Of course, such interference can also be avoided by modifying the size of the first support edge 414, depending on the specific needs of the product.

[0051] In other embodiments, the second connecting plate 420 includes a second connecting main plate 422 and a second support edge (not shown in the figure). The second support edge (not shown in the figure) is bent and connected to the end of the second connecting main plate 422, and the second support edge (not shown in the figure) extends along the length direction X of the battery module 1. The second connecting main plate 422 is located on the periphery of the battery module 1, and the second support edge (not shown in the figure) is located on the bottom side and / or top side of the battery module 1.

[0052] Thus, the supporting edge can provide some support to the bottom of the cell assembly 100, thereby further enhancing the constraint effect of the constraint frame 400 on the cell assembly 100. In this way, the integrity of the battery module 1 can be better guaranteed when the battery module 1 is transported separately, and the cell assembly 100 is less likely to detach from the constraint frame 400 when the battery pack 1000 is bumped.

[0053] The structure of the second support edge (not shown in the figure) can be specifically referred to the first support edge in other drawings, and will not be described in the drawings or further textual descriptions.

[0054] It should be noted that the "bottom side" mentioned above can refer to the bottom side of the battery module 1 in its normal position. If the battery module 1 is placed upside down, then the "bottom side" of the battery module 1 in its normal position becomes the "top side" in this case. This needs to be determined according to the specific situation.

[0055] For reference Figure 3 and Figure 4 In some embodiments, the battery module 1 further includes an insulating spacer 800 located between the constraint frame 400 and the battery cell.

[0056] Generally, since the battery cell assembly 100 generates heat during operation, in order to ensure the heat dissipation effect of the battery cell assembly 100, the constraint frame 400 is mostly made of metal with good constraint capacity. Therefore, the insulating separator 800 can further ensure the insulation between the battery cell assembly 100 and the constraint frame 400, thereby preventing leakage of the battery pack 1000 during use.

[0057] For reference Figure 5In some embodiments, the battery module 1 further includes a protection board 700 and cable ties (not shown in the figure). The protection board 700 is disposed on top of the cell assembly 100 and is electrically connected to the cell, the positive electrode connecting piece 120 or the negative electrode connecting piece 130. It should be understood that the protection board 700 is provided with a protection circuit that can monitor the discharge status of the cell. When the cell discharge is abnormal, the protection board 700 can promptly detect and control the power supply between the cell and external devices to prevent the battery module 1 from being damaged or failing due to abnormal discharge of the cell assembly 100.

[0058] The second connecting plate 420 is also provided with a connecting slot 424, and the protection plate 700 is provided with a connecting through hole (not shown in the figure). The cable tie (not shown in the figure) passes through the connecting slot 424 and the connecting through hole (not shown in the figure) to bind and connect the protection plate 700 and the second connecting plate 420. In this way, by reinforcing the distance between the protection plate 700 and the constraint frame 400, the constraint effect that the cell assembly 100 can be subjected to is increased, further ensuring the structural stability of the battery module 1. Thus, the electrical connection stability between the protection plate 700 and the cell, the positive electrode connection 120 or the negative electrode connection piece 130 is guaranteed, so that the protection plate 700 can monitor the discharge status of the cell in real time.

[0059] In some other embodiments, the surface of the protective plate 700 is provided with studs, and the cable ties strengthen the connection between the second connecting plate 420 and the protective plate 700 by binding the studs and the second connecting plate 420.

[0060] Please refer to Figure 9 In some embodiments, the first connecting plate 410 on the constraint frame 400 includes a first abutting protrusion 415 and a mounting connection 416. Along the height direction Z of the battery module 1, the mounting connection 416 is sequentially connected to the first abutting protrusion 415. The first abutting protrusion 415 protrudes in a direction away from the battery cell and abuts against the inner wall of the receiving cavity 21. The mounting connection 416 and the inner wall of the receiving cavity 21 are separated to form a placement space.

[0061] The positive electrode insulating member 550 of the fixing assembly 500 is disposed at the first connection position in the second connection portion 522, and the negative electrode insulating member 560 of the fixing assembly 500 is connected to the second connection position in the second connection portion 522. One end of the positive electrode insulating member 550 is connected to the positive electrode lead connection terminal 200 and the positive electrode connecting piece 120 through the second fixing member 530 in the fixing assembly 500, and the other end is connected to the second connection portion 522 through the third fixing member 540 in the fixing assembly 500. One end of the negative electrode insulating member 560 is connected to the negative electrode lead connection terminal 300 and the negative electrode connecting piece 130 through the second fixing member 530, and the other end is connected to the second connection portion 522 through the third fixing member 540. The second fixing member 530 is spaced apart from the third fixing member 540, and the second fixing member 530, the third fixing member 540, the positive electrode insulating member 550 and the negative electrode insulating member 560 are located in the placement space.

[0062] Specifically, the first abutting protrusion 415 abuts against the inner wall of the receiving cavity 21, and the mounting connection part 416 is used to connect other connecting plates to form a constraint frame 400. When the battery module 1 is placed in the receiving cavity 21, the first abutting protrusion 415 abuts against the receiving cavity 21 to reduce the impact that the cell assembly 100 can be subjected to. Thus, when the battery pack 1000 is subjected to external impact, the first abutting protrusion 415 can, to a certain extent, ensure that the cell assembly 100 is not damaged by external impact, thereby extending the service life of the battery pack 1000.

[0063] Furthermore, due to the protrusion of the first abutment protrusion 415, a placement space can be formed between the mounting connection part 416 and the inner wall of the receiving cavity 21. In this way, the positive electrode insulator 550, negative electrode insulator 560, second fixing part 530, third fixing part 540, positive electrode lead connection terminal 200, negative electrode lead connection terminal 300, positive electrode connecting piece 120, and negative electrode connecting piece 130 in the fixing assembly 500 can all be located in this control space. Thus, the space occupied by the battery module 1 in the receiving cavity 21 can be optimized, making the structure of the battery module 1 more compact. It can also ensure that the aforementioned components are not subjected to external force when the battery pack 1000 is subjected to external impact, thereby ensuring the connection stability between the components and their own structural stability.

[0064] For reference Figure 5 and Figure 10In some embodiments, the second connecting plate 420 in the constraint frame 400 is formed with a second constraint sidewall 421, and the first constraint sidewall 411 is adjacent to and intersects with the second constraint sidewall 421; the second connecting plate 420 includes a second abutting protrusion 425, which protrudes in a direction away from the battery cell and abuts against the inner wall of the receiving cavity 21. In this way, the second abutting protrusion 425 can absorb the impact of external forces on the battery pack 1000, reduce the external forces that the battery cell assembly 100 can be subjected to, and avoid damage to the battery cell assembly 100.

[0065] For reference Figure 10 In some embodiments, the second abutting protrusion 425 is provided with a through hole 426. On the one hand, the through hole 426 can reduce the weight of the second connecting plate 420 and reduce the material consumption of the second connecting plate 420, thereby reducing the production cost of the second connecting plate 420. On the other hand, if the second abutting protrusion 425 needs to be sprayed with an anti-oxidation coating or other coatings (such as color-differentiation layers), the coating powder can enter the internal space of the second abutting protrusion 425 through the through hole 426, thereby completing the overall spraying operation of the second connecting plate 420. In this way, it is ensured that the surface of the second connecting plate 420 can be fully coated with a coating, thus completing the protection operation of the second connecting plate 420 itself.

[0066] For reference Figure 5 , Figure 10 In some embodiments, the second connecting plate 420 includes a plurality of second abutting protrusions 425, which are spaced apart along the extending direction of the second connecting plate 420. In this way, the plurality of second abutting protrusions 425 can absorb the impact of external forces on the battery pack 1000 to a greater extent, further reducing the impact that the cell assembly 100 may be subjected to. In addition, the arrangement of the plurality of second abutting protrusions 425 can make the impact force more evenly distributed on the surface of the second connecting plate 420, avoiding deformation of a single second abutting protrusion 425 due to excessive external force, which would affect the protective function of the second connecting plate 420 during the subsequent use of the battery pack 1000.

[0067] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0068] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0069] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery module, characterized in that, include: A battery cell assembly includes a battery cell, a positive electrode connecting piece, and a negative electrode connecting piece. The battery cell includes a positive output terminal and a negative output terminal. The positive electrode connecting piece is electrically connected to the positive output terminal, and the negative electrode connecting piece is electrically connected to the negative output terminal. The positive lead connection terminal is electrically connected to the positive output terminal and is correspondingly connected to the positive connecting piece. The negative lead connection terminal is electrically connected to the negative output terminal and is correspondingly connected to the negative connection piece. A constraint frame is disposed around the periphery of the battery cell, the constraint frame including a first constraint sidewall; and The fixing component includes a first fixing member and a connecting sheet metal. The connecting sheet metal includes a first connecting part and a second connecting part that are bent and connected. The first connecting part has a first waist hole that extends along the height direction of the battery module. The first fixing member passes through the first waist hole to connect the first connecting part to the first constraint sidewall. The positive electrode connecting piece and the negative electrode connecting piece are disposed on the second connecting part.

2. The battery module as described in claim 1, characterized in that, The fixing component further includes a plurality of second fixing members, a plurality of third fixing members, a positive electrode insulating member and a negative electrode insulating member, the second connecting part having a first connecting position and a second connecting position, the positive electrode insulating member being disposed at the first connecting position and the negative electrode insulating member being disposed at the second connecting position; One end of the positive electrode insulating member is connected to the positive electrode connecting piece via the second fixing member and the positive electrode lead connecting terminal, and the other end is connected to the second connecting part via the third fixing member. One end of the negative electrode insulating member is connected to the negative electrode connecting piece via the second fixing member and the negative electrode lead connecting terminal, and the other end is connected to the second connecting part via the third fixing member, wherein the second fixing member and the third fixing member are spaced apart.

3. The battery module as described in claim 1, characterized in that, The constraint frame includes a first connecting plate and a second connecting plate connected adjacent to each other, and the first constraint sidewall is formed in the first connecting plate; the first connecting plate has a second waist hole, and the second waist hole extends along the width direction of the battery module. The battery module also includes a fourth fixing member, which connects the first connecting plate and the second connecting plate through the second waist hole.

4. The battery module as described in claim 3, characterized in that, The first connecting plate includes a first connecting main board and a first supporting edge. The first supporting edge is bent and connected to the end of the first connecting main board, and the first supporting edge extends along the length direction of the battery module. The first connecting main board is located on the periphery of the battery module, and the first supporting edge is located on the bottom side of the battery module. And / or, the second connecting plate includes a second connecting main board and a second supporting edge, the second supporting edge being bent and connected to the end of the second connecting main board, and the second supporting edge extending along the length direction of the battery module, wherein the second connecting main board is located on the periphery of the battery module, and the second supporting edge is located on the bottom side and / or top side of the battery module.

5. The battery module as described in claim 3, characterized in that, The battery module also includes a protection board and cable ties. The protection board is disposed on top of the battery cell assembly and is electrically connected to the battery cell, the positive electrode connecting piece, or the negative electrode connecting piece. The second connecting plate is also provided with a connecting slot, and the protective plate is provided with a connecting through hole. The cable tie passes through the connecting slot and the connecting through hole to tie and connect the protective plate and the second connecting plate.

6. The battery module as described in any one of claims 1 to 5, characterized in that, The battery module also includes an insulating separator located between the constraint frame and the battery cell.

7. A battery pack, characterized in that, include: The housing, including the receiving cavity; and The battery module as described in any one of claims 1 to 6, wherein the battery module is located in the receiving cavity.

8. The battery pack as described in claim 7, characterized in that, The first connecting plate on the constraint frame includes a first abutting protrusion and a mounting connecting part. Along the height direction of the battery module, the mounting connecting part is sequentially connected to the first abutting protrusion. The first abutting protrusion protrudes in a direction away from the battery cell and abuts against the inner wall of the receiving cavity. The mounting connecting part and the inner wall of the receiving cavity are separated to form a placement space. The positive electrode insulating member of the fixing assembly is disposed at the first connection position in the second connection part, and the negative electrode insulating member of the fixing assembly is connected to the second connection position in the second connection part. One end of the positive electrode insulating member is connected to the positive electrode lead connection terminal and the positive electrode connecting piece through the second fixing member of the fixing assembly, and the other end is connected to the second connection part through the third fixing member of the fixing assembly. One end of the negative electrode insulating member is connected to the negative electrode lead connection terminal and the negative electrode connecting piece through the second fixing member, and the other end is connected to the second connection part through the third fixing member. The second fixing member is spaced apart from the third fixing member, and the second fixing member, the third fixing member, the positive electrode insulating member and the negative electrode insulating member are located in the placement space.

9. The battery pack as described in claim 7 or 8, characterized in that, The second connecting plate in the constraint frame has a second constraint sidewall, and the first constraint sidewall and the second constraint sidewall are adjacent to and intersect each other; The second connecting plate includes a second abutting protrusion, which protrudes in a direction away from the battery cell and abuts against the inner wall of the receiving cavity.

10. The battery pack as claimed in claim 9, characterized in that, The battery pack also includes a padding layer sandwiched between the constraint frame and the outer shell; And / or, the second abutting protrusion has a through hole; and / or, the second connecting plate includes a plurality of second abutting protrusions, which are spaced apart along the extending direction of the second connecting plate.

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