Battery module structure of battery pack

Abstract

The utility model discloses a battery module structure of a battery pack, which comprises a bracket, a battery cell arranged in the bracket, and a connecting sheet contacted with the battery cell and used for electrical conduction, the connecting sheet is provided with a tab, the connecting sheet comprises an edge connecting sheet, the edge connecting sheet is provided with a main surface and an auxiliary surface, the main surface is connected with the auxiliary surface, and an included angle is formed between the main surface and the auxiliary surface. The main surface is provided with a plurality of contact surfaces which are punched and bulged and are in contact with a battery cell electrode, the edge connecting sheets are arranged at corners of the bracket, and the tabs are arranged on the main surface or the auxiliary surface, or the main surface and the auxiliary surface are respectively provided with the tabs. Compared with the prior art, the connecting piece has the advantages that the contact surface of the connecting piece is increased through the arrangement of the main surface and the auxiliary surface of the connecting piece, so that the overcurrent capacity of the connecting piece during overcurrent is increased, heat generated during heating is dissipated, the average heat on the connecting piece is reduced, the performance of a battery cell is effectively improved, the service life of the battery cell is effectively prolonged, and the risk of thermal runaway is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery pack relates to battery module, especially the battery module structure of battery pack. BACKGROUND

[0002] The battery pack is an integrated system composed of multiple battery units (battery core), which meets the specific voltage and capacity requirements through specific configuration and connection mode to provide energy driving for portable electronic devices, wherein the multiple battery units are limited by the support, and the battery units are connected in series or parallel through a plurality of connecting pieces to form a module, and the connecting pieces are provided with a tab for electrical connection.

[0003] The patent with the authorized announcement number CN217507511U provides a wire-free welding lithium ion battery pack, which comprises a support, a cylindrical battery core, a BMS and a nickel strip, a plurality of cylindrical battery cores are installed between the two supports, the nickel strip is attached to the outer side of the support, the protruding contact surface on the nickel strip is embedded into the electrode hole to contact and weld the electrode contact point of the cylindrical battery core, the BMS is installed above the two supports, and the nickel strip is connected with the input end of the BMS.

[0004] In the patent, the part of the protruding contact surface on the nickel strip is a plane structure, and the area of the nickel strip is related to the overcurrent capacity and heat dissipation, so the heat is concentrated, the overcurrent is small, and the performance and service life of the battery unit are reduced, and the risk of thermal runaway is increased. UTILITY MODEL CONTENTS

[0005] The utility model solves the problem of small nickel strip area on the existing battery pack module, which leads to small overcurrent and heat concentration, and the technical problem to be solved by the utility model is to provide a battery module structure of a battery pack, which can improve the overcurrent capacity and disperse heat.

[0006] The technical scheme adopted by the utility model to solve the above technical problem is that the battery module structure of the battery pack comprises a support, a battery core installed in the support, and a connecting piece in contact with the battery core and used for electrical conduction, and the connecting piece is provided with a tab.

[0007] The connecting piece comprises an edge connecting piece, the edge connecting piece is provided with a main surface and a secondary surface, the main surface and the secondary surface are connected, and an included angle is formed between the main surface and the secondary surface.

[0008] A plurality of protruding contact surfaces in contact with the electrode of the battery core are arranged on the main surface, and the edge connecting piece is installed at the edge corner of the support.

[0009] The tab is arranged on the main surface or the secondary surface, or the main surface and the secondary surface are each provided with the tab.

[0010] A further preferred embodiment of this utility model is: the connecting piece further includes an intermediate connecting piece, the intermediate connecting piece is provided with the main surface, and the electrode tab is connected to the main surface.

[0011] A further preferred embodiment of this utility model is: the number of contact surfaces on the main surface of the connecting piece is even, and one contact surface is in contact with the positive or negative electrode of a battery cell, and the electrodes of the battery cell on the connecting piece are alternately distributed.

[0012] A further preferred embodiment of this utility model is: the bracket is provided with a groove for installing the main surface or the main surface and the secondary surface, and the groove for installing the main surface and the secondary surface is L-shaped.

[0013] A further preferred embodiment of this utility model is: the bracket is provided with a second groove that communicates with the first groove, and the tab of the connecting piece is located in the second groove.

[0014] A further preferred embodiment of this utility model is: the electrode tab is provided with a connecting edge that connects to the main surface or the secondary surface, and an upper edge that connects to the connecting edge.

[0015] A further preferred embodiment of this utility model is: the end face of the bracket with the second groove is the mounting surface, and a plurality of spacer ribs are protruding from the mounting surface, with the upper edge extending above the spacer ribs.

[0016] A further preferred embodiment of this utility model is: a limiting plate is provided on several of the aforementioned spacer bars, and several limiting holes are provided on the limiting plate, with the upper edge inserted into and passing through the limiting holes.

[0017] A further preferred embodiment of this utility model is as follows: the limiting plate is provided with a plurality of connecting holes, and the mounting surface is provided with connecting posts that are aligned one-to-one with the connecting holes, wherein the connecting posts are attached to the limiting plate or inserted into the connecting holes.

[0018] A further preferred embodiment of this utility model is as follows: the bracket includes a frame one and a frame two, each of the frame one and the frame two being provided with a socket for inserting a power supply core, and the frame one and the frame two being detachably connected by screws, hooks, or fasteners.

[0019] Compared with the prior art, the advantages of this embodiment are that by setting the main surface and the secondary surface of the connecting piece, the contact surface of the connecting piece is increased, which increases the current carrying capacity of the connecting piece when a large current is applied, and the heat generated during heating is distributed, which reduces the average heat on the connecting piece. This effectively improves the performance of the battery cell, extends the life of the battery cell, and reduces the risk of thermal runaway. Attached Figure Description

[0020] The utility model will be further described in detail in combination with the drawings and preferred embodiments, but the person skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments, and therefore should not be regarded as limiting the scope of the utility model, in addition, unless specifically pointed out, the drawings only schematically show the composition or structure of the described object conceptually and can contain exaggerated display, and the drawings are not necessarily drawn to scale.

[0021] Figure 1 It is the structure schematic drawing of battery module of preferred embodiment of the utility model;

[0022] Figure 2 It is the structure schematic drawing of battery module of preferred embodiment of the utility model; Figure 1 It is the enlarged schematic view of A part in the utility model;

[0023] Figure 3 It is the partial sectional view of battery module of preferred embodiment of the utility model;

[0024] Figure 4 It is one of the explosion view of battery module of preferred embodiment of the utility model;

[0025] Figure 5 It is the second explosion view of battery module of preferred embodiment of the utility model.

[0026] In the drawing: 1, support, 1a, frame body one, 1a1, connecting section, 1a2, hook buckle part, 1b, frame body two, 1b1, hook mouth, 11, groove one, 12, mounting surface, 13, groove two, 14, connecting column, 15, jack, 16, spacing rib;2, electric core;3a, edge connecting sheet, 3b, intermediate connecting sheet, 31, main surface, 32, auxiliary surface, 33, contact surface, 34, tab, 34a, edge, 34b, upper edge;4, limit plate, 41, limit hole, 42, connecting hole. DETAILED DESCRIPTION

[0027] The preferred embodiments of the utility model will be described in detail below with reference to the drawings, and the person skilled in the art will appreciate that these descriptions are only descriptive, exemplary, and should not be interpreted as limiting the protection scope of the utility model.

[0028] It should be noted that: similar reference numerals represent similar items in the following drawings, therefore, once an item is defined in one drawing, it can not be further defined and explained in the subsequent drawings.

[0029] The embodiment mainly sets forth the battery module structure of the battery pack that can improve the overcurrent capacity and disperse heat, and is as follows:

[0030] As Figures 1-5As shown, the battery module structure of the battery pack comprises a support 1 composed of a first frame body 1a and a second frame body 1b which are detachably connected, a plurality of battery cells 2 which are inserted and installed between the first frame body 1a and the second frame body 1b, a connecting sheet provided with a lug 34 and in contact with the electrode of the battery cell 2, and a limiting plate 4 which is installed on the support 1 and can limit the lug 34 of the connecting sheet. The connecting sheet is installed on the support 1, and the lug 34 is provided on the connecting sheet and penetrates through the limiting plate 4.

[0031] In this embodiment, the connecting sheet comprises a marginal connecting sheet 3a and an intermediate connecting sheet 3b. The marginal connecting sheet 3a is located at the end of a row of intermediate connecting sheets 3b, that is, the marginal connecting sheet 3a is installed at the corner of the support 1.

[0032] The marginal connecting sheet 3a and the intermediate connecting sheet 3b are both provided with a main surface 31, and a plurality of contact surfaces 33 which are punched out and in contact with the electrode of the battery cell 2 are provided on the main surface 31. The number of the contact surfaces 33 is usually even, and the electrodes of the battery cells 2 contacted by adjacent contact surfaces 33 on one marginal connecting sheet 3a or one intermediate connecting sheet 3b are different, that is, the electrodes of the battery cells 2 on the marginal connecting sheet 3a or the intermediate connecting sheet 3b are alternately distributed in positive and negative. Therefore, the heat generated when the battery cell 2 is powered is concentrated at the position between two adjacent contact surfaces 33, and the heat concentration positions on the marginal connecting sheet 3a or the intermediate connecting sheet 3b are arranged in multiple, so that the heat concentration points are dispersed, which is more conducive to heat dissipation.

[0033] The marginal connecting sheet 3a is further provided with a secondary surface 32 which is connected with the main surface 31. Since the marginal connecting sheet 3a is installed at the corner of the support 1, an included angle is formed between the main surface 31 and the secondary surface 32. The included angle can be adjusted by bending according to the angle of the corner of the support 1. Preferably, the lug 34 on the marginal connecting sheet 3a can be connected with the main surface 31 or the secondary surface 32. The lug 34 connected with the main surface 31 or the secondary surface 32 also forms an included angle with the secondary surface 32 or the main surface 31.

[0034] Or the main surface 31 and the secondary surface 32 are each connected with a lug 34. At this time, the lugs 34 connected with the main surface 31 and the secondary surface 32 on the main surface 31 and the secondary surface 32 respectively also form an included angle.

[0035] In this application, by providing the marginal connecting sheet 3a with the main surface 31 and the secondary surface 32 and increasing the contact surface 33 of the marginal connecting sheet 3a, the overcurrent capacity of the marginal connecting sheet 3a is increased when a large current overflows, and the heat generated when heating is dispersed, so that the average heat on the connecting sheet is reduced, the performance of the battery cell 2 is effectively improved, the service life of the battery cell 2 is prolonged, and the risk of thermal runaway is reduced.

[0036] As shown in the drawings, Figures 2-5As shown, the bracket 1 is provided with a groove one 11 for installing the main face 31 of the middle connecting sheet 3b or the main face 31 and the secondary face 32 of the edge connecting sheet 3a, wherein the groove one 11 for installing the main face 31 and the secondary face 32 of the edge connecting sheet 3a is in L-shaped structure, and the bracket 1 is provided with an installation surface 12, the installation surface 12 is provided with a groove two 13 for installing the tab 34, the groove two 13 is communicated with the groove one 11, and the tab 34 extends out of the groove two 13 and passes through the limiting plate 4.

[0037] In the embodiment, the limiting plate 4 is provided with a plurality of limiting holes 41, the tab 34 is provided with a connecting edge 34a connected with the main face 31 or the secondary face 32, and an upper edge 34b connected with the connecting edge 34a, the connecting edge 34a is located in the groove two 13, and the upper edge 34b extends out of the limiting hole 41 of the limiting plate 4.

[0038] In order to avoid that the distance between the limiting plate 4 and the installation surface 12 is close, so that the heat on the tab 34 of the connecting sheet is not easy to dissipate, the installation surface 12 is provided with a plurality of spacing ribs 16, the limiting plate 4 is attached to the spacing ribs 16, by the setting of the spacing ribs 16, the distance between the limiting plate 4 and the installation surface 12 is increased, so that the heat on the tab 34 of the connecting sheet is more easy to dissipate.

[0039] At the same time, in order to avoid the movement of the limiting plate 4 relative to the bracket 1, the bracket 1 is provided with a plurality of connecting columns 14, and the limiting plate 4 is provided with a plurality of connecting holes 42, the connecting holes 42 are aligned with the positions of the connecting columns 14, the connecting columns 14 are attached to the limiting plate 4 or inserted into the connecting holes 42, and the connecting columns 14 can be threadedly connected with screws.

[0040] As shown in the drawings, Figure 5 The bracket 1 is provided with a groove one 11, a groove two 13, a spacing rib 16 and a connecting column 14 on the bracket body one 1a and the bracket body two 1b, and the bracket body one 1a and the bracket body two 1b are provided with a plug hole 15, and the battery cell 2 is inserted into the plug hole 15 of the bracket body one 1a and the bracket body two 1b for installation.

[0041] The bracket body one 1a is provided with an elastic connecting section 1a1, and the connecting section 1a1 is provided with a hooking part 1a2, and the bracket body two 1b is provided with a hook 1b1 matched with the hooking part 1a2, the bracket body one 1a and the bracket body two 1b are detachably installed through the hooking matching, preferably, the bracket body one 1a and the bracket body two 1b can also be detachably installed through screw connection or hooking.

[0042] In the description of the utility model, it is necessary to explain that the terms "upper", "lower", "front", "rear", "inner", "outer" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed during use, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0043] The battery module structure of the battery pack provided by the utility model is described in detail above, the principle and implementation mode of the utility model are described by applying specific examples in this paper, and the above embodiment description is only for helping to understand the utility model and the core idea, and it should be pointed out that, for ordinary technical personnel in the technical field, some improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. A battery module structure of a battery pack, including a bracket, a battery cell installed in the bracket, and a connecting piece that contacts the battery cell and is used for electrical conduction, wherein the connecting piece is provided with tabs; Its features are, The connecting piece includes an edge connecting piece, which has a main surface and a secondary surface, the main surface and the secondary surface are connected, and the main surface and the secondary surface form an angle between them; The main surface is provided with several stamped protrusions that contact the battery cell electrodes, and the edge connecting piece is installed at the corner of the bracket. The electrode tab is disposed on the main surface or the secondary surface, or the electrode tab is disposed on both the main surface and the secondary surface.

2. The battery module structure of the battery pack according to claim 1, characterized in that, The connecting piece also includes an intermediate connecting piece, which has the main surface, and the electrode tab is connected to the main surface.

3. The battery module structure of the battery pack according to claim 2, characterized in that, The number of contact surfaces on the main surface of the connecting piece is even, and one contact surface is in contact with the positive or negative electrode of a battery cell. The electrodes of the battery cell on the connecting piece are distributed alternately for positive and negative electrodes.

4. The battery module structure of the battery pack according to claim 1 or 2, characterized in that, The bracket is provided with a groove for installing the main surface or the main surface and the secondary surface, and the groove for installing the main surface and the secondary surface is L-shaped.

5. The battery module structure of the battery pack according to claim 4, characterized in that, The bracket is provided with a second groove that connects to the first groove, and the tab of the connecting piece is located in the second groove.

6. The battery module structure of the battery pack according to claim 5, characterized in that, The electrode tab is provided with a connecting edge that connects to the main surface or the secondary surface, and an upper edge that connects to the connecting edge.

7. The battery module structure of the battery pack according to claim 6, characterized in that, The end face of the bracket with the second groove is the mounting surface, and several spacer ribs are protruding from the mounting surface, with the upper edge extending above the spacer ribs.

8. The battery module structure of the battery pack according to claim 7, characterized in that, A limiting plate is provided on several of the aforementioned spacer bars, and several limiting holes are provided on the limiting plate. The upper edge is inserted into and passes through the limiting holes.

9. The battery module structure of the battery pack according to claim 8, characterized in that, The limiting plate has several connecting holes, and the mounting surface has connecting posts that are aligned one-to-one with the connecting holes. The connecting posts are attached to the limiting plate or inserted into the connecting holes.

10. The battery module structure of the battery pack according to claim 1, characterized in that, The bracket includes a frame one and a frame two. Each of the frame one and the frame two is provided with a socket for inserting a power supply core. The frame one and the frame two are detachably connected by screws, hooks, or fasteners.

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