Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a battery cell module, a limiting piece and a binding piece, the battery cell module comprises a plurality of battery cell groups; each battery cell group comprises a first end plate, a second end plate and a plurality of battery cells clamped between the first end plate and the second end plate; the plurality of battery cells in each battery cell group are arranged along a first direction, the plurality of battery cell groups are arranged along a second direction, and the first direction is different from the second direction. And the limiting piece is connected with the plurality of battery cell groups and limits the plurality of battery cell groups. And the binding pieces are arranged between the two adjacent battery cell groups. One end of the binding piece is connected with at least one first end plate, and the other end of the binding piece is connected with at least one second end plate. According to the battery pack provided by the invention, the structural strength of the battery pack is higher by arranging the binding piece.

Description

Technical Field

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

[0002] During the use of batteries, after multiple charge and discharge cycles, irreversible chemical reactions are likely to occur. This causes the volume of the battery cells to gradually expand. Existing technologies cannot suppress the expansion of the battery cells, so the life of the battery pack depends largely on the degree of expansion of the battery cells. When the battery cells expand to the point where they may damage the structural parts in the battery pack, causing the battery pack to break, the battery pack needs to be discarded. For example, the battery cells may crack the steel straps used to bundle the batteries in the battery pack. However, even when the degree of expansion of the battery cells is high, it does not affect the normal discharge of the battery cells. Therefore, if the battery pack is discarded as soon as the battery cells swell slightly, it will undoubtedly waste the longer discharge life of the battery cells. In order to extend the service life of the battery pack, a battery pack with greater structural strength is required. Utility Model Content

[0003] The embodiment of the present application provides a battery pack to solve the problem that the structural strength of the existing battery pack is not strong enough.

[0004] The present application provides a battery pack, including:

[0005] A cell module, comprising a plurality of cell groups; each cell group comprises a first end plate, a second end plate and a plurality of cells sandwiched between the first end plate and the second end plate; the plurality of cells in each cell group are arranged along a first direction, and the plurality of cell groups are arranged along a second direction, and the first direction and the second direction are different;

[0006] A limiting member, connecting the plurality of battery cell groups and limiting the plurality of battery cell groups;

[0007] A restraining member is arranged between two adjacent groups of the battery cell groups; one end of the restraining member is connected to at least one of the first end plates, and the other end of the restraining member is connected to at least one of the second end plates.

[0008] In some embodiments, the limiting member surrounds the circumference of the battery cell module.

[0009] In some embodiments, the limiting member includes a connecting bracket and a limiting belt; the two ends of the limiting belt are respectively connected to the two ends of the connecting bracket and surround the circumference of the battery cell module; the first end plates of the multiple battery cell groups are arranged at the same end; the connecting bracket is connected to the first end plates of the multiple battery cell modules; the restraining member is connected to the connecting bracket to connect the multiple first end plates.

[0010] In some embodiments, the tie-down member includes an extension portion, a protrusion, and a first locking member;

[0011] The extension portion is arranged between two adjacent groups of battery cell groups, and one end of the extension portion is passed through the connecting bracket and is screwed to the first locking piece; the protrusion is connected to one end of the extension portion away from the connecting bracket, and the protrusion is connected to the second end plate; wherein, the first locking piece can be rotated to make the second end plate approach or move away from the first end plate.

[0012] In some embodiments, the protrusion is provided with a first strip-shaped through hole extending along the first direction, and the second end plate is provided with a matching hole at a position opposite to the first strip-shaped through hole, and the end of the first fixing member passes through the first strip-shaped through hole and the matching hole in sequence to be fixedly connected with the second end plate.

[0013] In some embodiments, the protrusion includes a first part and a second part, the first part is connected to the second part at an angle, wherein the first strip-shaped through hole is opened in the first part, and the second part abuts against the side of the second end plate away from the first end plate.

[0014] In some embodiments, the battery pack further includes a pulling assembly; the pulling assembly extends along the first direction; one end of the pulling assembly is used to pull the connecting bracket, and the other end is used to pull the limiting belt close to the second end plate.

[0015] In some embodiments, the pulling assembly includes a pulling member, a first abutment block, a second abutment block and two second locking members; the pulling member extends along the first direction; the two ends of the pulling member are respectively passed through the first abutment block and the second abutment block; the two second locking members are respectively screwed to the two ends of the pulling member; the first abutment block abuts against the side of the connecting bracket away from the first end plate; the second abutment block abuts against the side of the limiting belt away from the second end plate; wherein, the second locking member can be rotated to make the first abutment block and the second abutment block closer or farther away.

[0016] In some embodiments, a flexible member is provided between the battery core module and the pulling member; and / or

[0017] The first abutment block and the second abutment block are both provided with a third strip through hole extending along the first direction; the third strip through hole is used for a third fixing member to pass through, so that the first abutment block and the second abutment block are fixedly connected to the first end plate and the second end plate respectively through the third fixing member.

[0018] In some embodiments, the surface of the pulling member is covered with an insulating layer; and / or

[0019] The surface of the limiting belt is covered with an insulating layer; and / or

[0020] The surface of the restraining member is covered with an insulating layer; and / or

[0021] The limiting member also includes a third locking member and a connecting member; the connecting member is passed through the connecting bracket and the limiting belt and cooperates with the third locking member to connect the limiting belt and the connecting bracket; an insulating cap is provided on at least one of the first locking member, the second locking member and the third locking member.

[0022] In some embodiments, a belt-passing groove is provided on the second end plate; the limiting belt passes through the belt-passing groove.

[0023] In some embodiments, the battery pack further includes a fixing block; the fixing block is fixedly connected to the second end plate; and the fixing block at least partially blocks a notch of the belt slot.

[0024] In some embodiments, the battery pack further comprises a steel belt; at least one of the steel belts is wound around each group of battery cells.

[0025] The battery pack provided in the embodiment of the present application has a greater structural strength by providing a first end plate and a second end plate, and providing a restraining member to connect the first end plate and the second end plate. Specifically, the first end plate and the second end plate are provided at both ends of the battery cell group, so that when the battery cell expands, it will push the first end plate and the second end plate so that the first end plate and the second end plate are separated from each other. However, since the restraining member connects the first end plate and the second end plate, when the first end plate and the second end plate are separated from each other, the restraining member can prevent the first end plate and the second end plate from being separated from each other. Therefore, under the constraint of the restraining member, the first end plate and the second end plate can press against multiple battery cells and suppress the expansion of multiple battery cells. In this way, when the battery cell begins to expand, the restraining member can increase the connection strength between the first end plate and the second end plate, that is, increase the limiting strength of the battery cell group, thereby improving the structural strength of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0027] In order to more completely understand the present application and its beneficial effects, the following description will be made in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0028] Figure 1 A schematic diagram of the exploded structure of a battery pack provided in an embodiment of the present application;

[0029] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0030] Figure 3 for Figure 1 Enlarged view of part B;

[0031] Figure 4 for Figure 1 A schematic diagram of the assembly structure of the embodiment;

[0032] Figure 5 for Figure 4 Enlarged view of part C;

[0033] Figure 6 for Figure 4 A magnified view of part D in the middle;

[0034] Figure 7 for Figure 1 A schematic structural diagram of the second abutment block in the embodiment.

[0035] Description of Figure Numbers:

[0036] Label name Label name 100 Battery module 320 Limiting belt 110 Battery pack 321 The third locking piece 111 First end plate 322 Connectors 112 Second end plate 400 tray 112a Belt slot 510 Pulling piece 113 Battery Cell 520 First abutment block 200 Tie-downs 530 The second abutment block 210 Extension 531 The third strip through hole 220 convex part 531a The third fixing 221 The first strip through hole 540 Second locking piece 221a First fixing piece 600 Flexible parts 230 First lock 700 Insulation cap 310 Attach the bracket 800 Fixed block 311 The second strip through hole 900 Steel belt 311a Second fixing member 2201 Part I 2202 Part 2 DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0038] The embodiment of the present application provides a battery pack to solve the problem that the existing battery pack has insufficient structural strength. The embodiment of the present application will be described below with reference to the accompanying drawings.

[0039] refer to Figure 1 , an embodiment of the present application provides a battery pack, including a battery cell module 100, a limiter and a restraining member 200. The battery cell module 100 includes multiple battery cell groups 110, each battery cell group 110 includes a first end plate 111, a second end plate 112 and multiple battery cells 113 sandwiched between the first end plate 111 and the second end plate 112. The multiple battery cells 113 in each battery cell group 110 are arranged along a first direction, and the multiple battery cell groups 110 are arranged along a second direction, and the first direction and the second direction are set at an angle. The angle formed by the first direction and the second direction is not 0° or 180°. For example Figure 1 In the embodiment, the first direction and the second direction are approximately 90°, but other angles are also possible.

[0040] The limiting member connects the plurality of battery cell groups 110 and limits the plurality of battery cell groups 110. The limiting member is not limited to Figure 1 The connecting bracket 310 and the limiting belt 320 in the embodiment may also include Figure 1 The tray 400. Figure 1 The tray 400 in the figure can also be equipped with an upper cover (not shown in the figure), and the upper cover is buckled on the tray 400 to surround the battery module 100. Of course, the battery pack may not be provided with a tray 400 or an upper cover and other structures. Because the embodiments of the battery pack proposed in this application can also be applied to new energy vehicles. Some new energy vehicles directly use the body as the outer shell of the battery pack, so the tray 400 and / or the upper cover can be omitted. Of course, when the embodiments proposed in this application are applied to other battery fields, such as engineering machinery and other fields, a tray 400 and / or an upper cover can be provided to form an independent battery pack for easy replacement.

[0041] The restraining member 200 is disposed between two adjacent groups of battery cell groups 110, so that the gap between the battery cell groups 110 can be utilized to save the volume of the battery pack. One end of the restraining member 200 is connected to at least one first end plate 111, and the other end of the restraining member 200 is connected to at least one second end plate 112. When the battery cell 113 expands, the battery cell 113 will push the first end plate 111 and the second end plate 112, so that the first end plate 111 and the second end plate 112 are away from each other. If there is no constraint of the restraining member 200, the first end plate 111 and the second end plate 112 will directly push other structural parts (such as steel belts, trays 400 or upper covers, etc.), which may cause other structural parts to be damaged under the push of the first end plate 111 and the second end plate 112. The setting of the restraint 200 can restrain the first end plate 111 and the second end plate 112: when the battery cell 113 expands and pushes the first end plate 111 and the second end plate 112, since the two ends of the restraint 200 are respectively connected to the first end plate 111 and the second end plate 112, the first end plate 111 and the second end plate 112 will first involve the restraint 200 before pushing other structural parts, which allows the restraint 200 to restrain the first end plate 111 and the second end plate 112 in turn, preventing the first end plate 111 and the second end plate 112 from moving away from each other, thereby preventing the first end plate 111 and the second end plate 112 from pushing other structural parts, thereby improving the structural strength of the battery pack.

[0042] refer to Figure 1 and Figure 2 In some embodiments, the limiting member surrounds the periphery of the battery module 100. Since the battery cell 113 tends to expand in all directions, enclosing the periphery of the battery module 100 can more comprehensively limit the expansion of the battery cell 113 and further improve the strength of the battery pack. The limiting member can be a traditional steel strip 900, which is different from Figure 1In the embodiment shown, the steel belt 900 only surrounds the periphery of the battery cell group 110, but surrounds the periphery of the battery cell module 100. In this way, the battery cell 113 can be restricted as a whole; by arranging the steel belt around the periphery of the battery cell module and the steel belt around the periphery of the battery cell group, the structural strength of the battery pack is improved.

[0043] refer to Figure 1 and Figure 2 In some embodiments, the limiting member includes a connecting bracket 310 and a limiting belt 320. The two ends of the limiting belt 320 are respectively connected to the two ends of the connecting bracket 310, so that an annular structure is formed to enclose the circumference of the battery module 100. The first end plates 111 of multiple battery cell groups 110 are arranged at the same end, so that the second end plates 112 of multiple battery cell groups 110 are naturally distributed at the other same end. This allows the connecting bracket 310 to be connected to the first end plates 111 of multiple battery cell modules 100, and the restraining member 200 is connected to the connecting bracket 310, so that the restraining member 200 can indirectly connect to multiple first end plates 111 through the connecting bracket 310. This arrangement allows one restraining member 200 to pull multiple first end plates 111 at the same time, so as to save the number of restraining members 200 and reduce the volume of the battery pack.

[0044] refer to Figures 1 to 3In some embodiments, the restraint 200 includes an extension 210, a convex portion 220, and a first locking member 230. The extension 210 is disposed between two adjacent groups of battery cells 110, and one end of the extension 210 is passed through the connecting bracket 310 and is screwed with the first locking member 230. The convex portion 220 is connected to one end of the extension 210 away from the connecting bracket 310, and abuts against a side of the second end plate 112 away from the first end plate 111, so that when the extension 210 moves in the direction from the second end plate 112 to the first end plate 111, the convex portion 220 can pull the second end plate 112 so that the second end plate 112 approaches the first end plate 111. When the first locking member 230 rotates, it can pull the extension 210 so that the extension 210 moves in the direction from the second end plate 112 to the first end plate 111. Therefore, the first locking member 230 can be rotated to pull the extension part 210, and the convex part 220 can push the second end plate 112, so that the second end plate 112 is close to the first end plate 111; in addition, the first locking member 230 can be loosened so that the convex part 220 no longer pushes the second end plate 112, so that the second end plate 112 can be away from the first end plate 111. Such a setting can make the first end plate 111 and the second end plate 112 approach each other through the binding member 200 to apply pressure on the battery cell 113, thereby preventing the battery cell 113 from expanding. In addition, the cooperation between the first locking member 230 and the extension part 210 can amplify the torque of rotating the first locking member 230 into the force of pulling the extension part 210, so that the binding force applied by the first end plate 111 and the second end plate 112 to the battery cell 113 can more easily reach an appropriate value. The threaded fit between the first locking member 230 and one end of the extension 210 also has a self-locking effect, that is, although the extension 210 is pulled by the convex portion 220, it does not cause the first locking member 230 to rotate, so that the restraining member 200 is always locked in a preset position and is not easy to move. When the battery cell 113 expands, it will inevitably exert a greater force on the restraining member 200. At this time, due to the self-locking effect, the restraining member 200 will not move, thereby improving the restraining effect on the battery cell 113. Among them, the first locking member 230 can be a nut.

[0045] refer to Figure 3In some embodiments, the convex portion 220 is provided with a first strip through hole 221 extending along the first direction, and a matching hole is provided at a position of the second end plate 112 opposite to the first strip through hole 221, and the first strip through hole 221 is used for the first fixing member 221a to pass through, and the end of the first fixing member 221a passes through the first strip through hole 221 and the matching hole in sequence to be fixedly connected with the second end plate 112, so that the convex portion 220 is fixedly connected with the second end plate 112 through the first fixing member 221a. Specifically, the convex portion 220 may include a first portion 2201 and a second portion 2202, one end of the first portion 2201 is connected to the second portion 2202 at an angle, and the other end of the first portion 2201 extends in a direction away from the second portion 2202 and in the first direction, wherein the angle between the first portion and the second portion may be a right angle, so that the first portion 2201 and the second portion 2202 form an L-shaped convex portion 220. The first strip through hole 221 is formed in the first portion 2201, and the second portion 2202 abuts against a side of the second end plate 112 away from the first end plate 111. The first fixing member 221a may be a bolt, and the first fixing member 221a is threadedly connected to the second end plate 112.

[0046] refer to Figure 1 and Figure 2 It can be seen that when the first locking member 230 is rotated, the restraining member 200 moves in the first direction. Therefore, the position of the restraining member 200 when it stabilizes in the first direction (that is, when the tension on the restraining member 200 reaches the preset value) will fluctuate due to manufacturing tolerances (for example, the thickness of the battery in the first direction will be different, especially when multiple battery cells 113 are arranged into a battery cell group 110, the difference will be magnified due to the superposition of multiple battery cells 113). Since the first strip through hole 221 extends in the first direction, the position of the first fixing member 221a passing through the first strip through hole 221 in the first direction is adjustable, thereby overcoming the manufacturing tolerance and allowing the first fixing member 221a to pass through the protrusion 220 and the second end plate 112 normally through the first strip through hole 221, so that the protrusion 220 is fixed to the second end plate 112. In addition, Figure 1 In the embodiment shown, the first fixing member 221a can be threadedly matched with the tray 400 or the second end plate 112, depending on the actual needs of the battery pack. According to actual production needs, different battery modules may have different numbers and sizes of battery cell groups, so that the battery modules have different sizes. In the embodiment of the present application, the number and size of different battery cell groups can be matched by adjusting the size of the limiter, the first part, the pulling assembly, and the connecting bracket, so as to adapt to battery modules of various sizes and types.

[0047] refer to Figure 2In some embodiments, a second strip through hole 311 extending along the first direction is provided on the connecting bracket 310, and the second strip through hole 311 is used for the second fixing member 311a to pass through, so that the connecting bracket 310 and the first end plate 111 are fixedly connected through the second fixing member 311a. Since the connecting bracket 310 is pulled by the restraining member 200, it will also move or deform to a certain extent in the first direction. Therefore, the second strip through hole 311 makes the position where the second fixing member 311a passes through the connecting bracket 310 adjustable in the first direction, which overcomes the problem that the second fixing member 311a cannot pass through the connecting bracket 310 and the first end plate 111 at the same time due to the displacement or deformation of the connecting bracket 310. In addition, Figure 1 In the embodiment shown, the second fixing member 311a may also be threadedly matched with the first end plate 111 or the tray 400, depending on the actual needs of the battery pack. The second fixing member 311a may be a bolt.

[0048] refer to Figures 1 to 3 In some embodiments, the battery pack further includes a pulling assembly. The pulling assembly extends in a first direction, one end of the pulling assembly is used to pull the connecting bracket 310, and the other end is used to pull the limiting belt 320 close to the second end plate 112. The two ends of the pulling assembly respectively pull the connecting bracket 310 and the limiting belt 320, so that the contact positions of the two with the pulling assembly are close to each other, which actually increases the overall circumference of the connecting bracket 310 and the limiting belt 320, so that the tension on the connecting bracket 310 and the limiting belt 320 is increased, thereby increasing the restraint ability on the battery cell 113.

[0049] refer to Figures 1 to 3 In some embodiments, the pulling assembly includes a pulling member 510, a first abutting block 520, a second abutting block 530 and two second locking members 540. The pulling member 510 extends along the first direction, and the two ends of the pulling member 510 are respectively penetrated through the first abutting block 520 and the second abutting block 530. The two second locking members 540 are respectively screwed to the two ends of the pulling member 510. The first abutting block 520 abuts against the side of the connecting bracket 310 away from the first end plate 111, and the second abutting block 530 abuts against the side of the limiting belt 320 away from the second end plate 112. The second locking member 540 can be rotated to make the first abutting block 520 and the second abutting block 530 closer or farther away. Compare Figure 1 and Figure 4It can be seen that the distance between the first abutting block 520 and the second abutting block 530 is actually the distance between the two second locking members 540. When the second locking member 540 is rotated to make the second locking member 540 approach each other along the length direction of the pulling member 510, the first abutting block 520 and the second abutting block 530 will also approach each other, so that the part of the connecting bracket 310 abutted by the first abutting block 520 and the part of the limiting belt 320 abutted by the second abutting block 530 will also approach each other. In this way, the tension on the limiting belt 320 and the connecting bracket 310 is increased, and the restraining force on the battery cell 113 is increased. In addition, when the second locking members 540 are moved away from each other, space can be made for the first abutting block 520 and the second abutting block 530 to move away from each other, and the first abutting block 520 and the second abutting block 530 can move away from each other under the push of the connecting bracket 310 and the limiting belt 320 respectively. Among them, the second locking member 540 can be a nut, and the pulling member 510 can be a double-headed screw.

[0050] refer to Figure 1 and Figure 4 In some embodiments, a flexible member 600 is disposed between the battery module 100 and the pulling member 510. The flexible member 600 may be foam or soft glue. Figure 6 It can be seen that in order to reduce the volume of the battery cell 113, the pulling member 510 may be closely attached to the battery cell 113 after being installed. Therefore, the flexible member 600 can prevent the pulling member 510 from pressing the surface of the battery cell 113, thereby protecting the battery cell 113.

[0051] refer to Figure 3 and Figure 7 In some embodiments, the first abutting block 520 and the second abutting block 530 are both provided with a third strip-shaped through hole 531 extending along the first direction. The third strip-shaped through hole 531 is used for the third fixing member 531a to pass through, so that the first abutting block 520 and the second abutting block 530 are fixedly connected to the first end plate 111 and the second end plate 112 through the third fixing member 531a respectively. The first abutting block 520 and the second abutting block 530 will also move in the first direction under the push of the second locking member 540, so the installation position of the first abutting block 520 relative to the first end plate 111 and the installation position of the second abutting block 530 relative to the second end plate 112 will deviate in the first direction. The third strip through hole 531 ensures that the third fixing member 531a can pass through the first abutting block 520 and the second abutting block 530 normally, and then pass through the first end plate 111 and the second end plate 112 respectively, so that the first abutting block 520 and the first end plate 111 are fixedly connected, and the second abutting block 530 and the second end plate 112 are fixedly connected. In addition, the arrangement of the third strip through hole 531 on the first abutting block 520 can also refer to Figure 7, because the first abutting block 520 and the second abutting block 530 can be of the same structure. Wherein, the third fixing member 531a can be a bolt.

[0052] refer to Figure 1 In some embodiments, the surface of the pulling member 510 is covered with an insulating layer, which can prevent the leakage current from being conducted through the pulling member 510 and burning other cells 113 when the battery cell 113 leaks electricity accidentally, thereby improving the safety of the battery pack. The insulating layer can be an insulating sleeve mounted on the surface of the pulling member 510, or an insulating glue coated on the surface of the pulling member 510.

[0053] refer to Figure 1 In some embodiments, the surface of the limiting strip 320 is covered with an insulating layer. This can prevent the leakage current from being conducted through the limiting strip 320 when the battery cell 113 leaks electricity accidentally, thereby preventing other battery cells 113 from being burned, thereby improving the safety of the battery pack. The insulating layer can be an insulating sleeve sleeved on the surface of the limiting strip 320, or an insulating glue coated on the surface of the limiting strip 320.

[0054] refer to Figure 1 In some embodiments, the surface of the restraint 200 is covered with an insulating layer. This can prevent the leakage current from being conducted through the restraint 200 and burning other cells 113 when the battery cell 113 leaks electricity accidentally, thereby improving the safety of the battery pack. The insulating layer can be an insulating sleeve mounted on the surface of the restraint 200, or an insulating glue coated on the surface of the restraint 200.

[0055] refer to Figure 2 In some embodiments, the limiting member further includes a third locking member 321 and a connecting member 322. The connecting member 322 is inserted through the connecting bracket 310 and the limiting strip 320 and cooperates with the third locking member 321 to connect the limiting strip 320 and the connecting bracket 310. An insulating cap 700 is provided on at least one of the first locking member 230, the second locking member 540 and the third locking member 321. The provision of the insulating cap 700 can prevent the sharp or sharp part of the nut surface from producing a tip discharge phenomenon when the battery cell 113 leaks electricity, avoid the generation of arcs, improve the safety of the battery pack, and avoid micro-discharge of the battery cell 113, so as to increase the service life of the battery pack. Among them, the third locking member can be a nut, and the connecting member 322 can be a screw.

[0056] refer to Figure 4 and Figure 5 In some embodiments, a belt-passing groove 112a is provided on the second end plate 112. The limiting belt 320 passes through the belt-passing groove 112a. In this way, the belt-passing groove 112a can prevent the limiting belt 320 from moving in a direction perpendicular to the first direction and the second direction at the same time, thereby improving the stability of the limiting belt 320.

[0057] refer to Figures 3 to 5In some embodiments, the battery pack further includes a fixing block 800. The fixing block 800 is fixedly connected to the second end plate 112. The fixing block 800 at least partially blocks the slot of the belt slot 112a. In this way, the limiting belt 320 is limited in the belt slot 112a by the fixing block 800, further fixing the position of the limiting belt 320 and improving the stability of the limiting belt 320. It is worth noting that, referring to Figure 5 In fact, the limiting belt 320 and the steel belt 900 share the belt-passing groove 112 a , so that the belt-passing groove 112 a can fix the steel belt 900 and the limiting belt 320 at the same time.

[0058] refer to Figure 2 In some embodiments, the battery pack further includes a steel belt 900. The steel belt 900 may be a PET steel belt, a SUS steel belt, or a 65Mn steel belt, etc. (the limiting belt 320 may also be one of these steel belts). At least one steel belt 900 is wound around each battery cell group 110. In this way, the steel belt 900 cooperates with the limiting member and the restraining member 200 to jointly limit the expansion of the battery cell 113 and improve the structural strength of the battery pack.

[0059] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0060] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0061] The battery pack provided in the embodiment of the present application is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: include: A cell module, comprising a plurality of cell groups; each cell group comprises a first end plate, a second end plate and a plurality of cells sandwiched between the first end plate and the second end plate; the plurality of cells in each cell group are arranged along a first direction, and the plurality of cell groups are arranged along a second direction, and the first direction and the second direction are different; A limiting member, connecting the plurality of battery cell groups and limiting the plurality of battery cell groups; A restraining member is arranged between two adjacent groups of the battery cell groups; one end of the restraining member is connected to at least one of the first end plates, and the other end of the restraining member is connected to at least one of the second end plates.

2. The battery pack according to claim 1, characterized in that: The limiting member surrounds the peripheral side of the battery module.

3. The battery pack according to claim 2, characterized in that: The limiting member includes a connecting bracket and a limiting belt; the two ends of the limiting belt are respectively connected to the two ends of the connecting bracket and surround the circumference of the battery cell module; the first end plates of the multiple battery cell groups are arranged at the same end; the connecting bracket is connected to the first end plates of the multiple battery cell modules; the restraining member is connected to the connecting bracket to connect the multiple first end plates.

4. The battery pack according to claim 3, characterized in that: The tie-down member includes an extension portion, a protrusion, and a first locking member; The extension portion is arranged between two adjacent groups of battery cell groups, and one end of the extension portion is passed through the connecting bracket and is screwed to the first locking piece; the protrusion is connected to one end of the extension portion away from the connecting bracket, and the protrusion is connected to the second end plate; wherein, the first locking piece can be rotated to make the second end plate approach or move away from the first end plate.

5. The battery pack according to claim 4, characterized in that: The convex portion is provided with a first strip through hole extending along the first direction, and the second end plate is provided with a matching hole at a position opposite to the first strip through hole, and the end of the first fixing member passes through the first strip through hole and the matching hole in sequence to be fixedly connected with the second end plate.

6. The battery pack according to claim 5, characterized in that: The convex portion includes a first portion and a second portion, the first portion is connected to the second portion at an angle, wherein the first strip-shaped through hole is opened in the first portion, and the second portion abuts against a side of the second end plate away from the first end plate.

7. The battery pack according to claim 4, characterized in that: The battery pack also includes a pulling assembly; the pulling assembly extends along the first direction; one end of the pulling assembly is used to pull the connecting bracket, and the other end is used to pull the limiting belt close to the second end plate.

8. The battery pack according to claim 7, characterized in that: The pulling assembly includes a pulling member, a first abutment block, a second abutment block and at least two second locking members; the pulling member extends along the first direction; the two ends of the pulling member are respectively passed through the first abutment block and the second abutment block; the two second locking members are respectively screwed with the two ends of the pulling member; the first abutment block abuts against the side of the connecting bracket away from the first end plate; the second abutment block abuts against the side of the limiting belt away from the second end plate; wherein, the second locking member can be rotated to make the first abutment block and the second abutment block approach or move away.

9. The battery pack according to claim 8, characterized in that: A flexible member is provided between the battery core module and the pulling member; and / or The first abutment block and the second abutment block are both provided with a third strip through hole extending along the first direction; the third strip through hole is used for a third fixing member to pass through, so that the first abutment block and the second abutment block are fixedly connected to the first end plate and the second end plate respectively through the third fixing member.

10. The battery pack according to claim 8, characterized in that: The surface of the pulling member is covered with an insulating layer; and / or The surface of the limiting belt is covered with an insulating layer; and / or The surface of the restraining member is covered with an insulating layer; and / or The limiting member also includes a third locking member and a connecting member; the connecting member is passed through the connecting bracket and the limiting belt and cooperates with the third locking member to connect the limiting belt and the connecting bracket; an insulating cap is provided on at least one of the first locking member, the second locking member and the third locking member.

11. The battery pack according to any one of claims 3 to 10, characterized in that: The second end plate is provided with a belt-passing groove; the limiting belt passes through the belt-passing groove.

12. The battery pack according to claim 11, characterized in that: The battery pack also includes a fixing block; the fixing block is fixedly connected to the second end plate; the fixing block at least partially covers the notch of the belt slot.

13. The battery pack according to any one of claims 3 to 10, characterized in that: The battery pack also includes a steel belt; at least one of the steel belts is wound around each group of battery cells.

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