Battery elastic sheet and battery module comprising same

Abstract

The utility model discloses a battery elastic sheet and a battery module comprising the same, and relates to the technical field of battery structures. The battery elastic sheet comprises a base disc, a touch disc and a plurality of elastic pieces, the base disc is provided with a first through hole penetrating through the base disc in the first direction. The touch disc and the base disc are arranged at an interval along the first direction; the elastic pieces are located in the first through holes, one ends of the elastic pieces are annularly arranged on the inner ring side of the base disc in the circumferential direction, and the other ends of the elastic pieces are connected with the outer circumferential side of the touch disc. By adopting the technology provided by the utility model, the current transmission efficiency can be effectively improved, and the subsequent disassembly operation of the battery is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery structure technical field, concretely relates to a battery spring piece and the battery module containing it. BACKGROUND

[0002] The electric vehicle lithium battery is mainly a whole integrated product composed of lithium battery core, protection plate (BMS), shell and internal structural member, and the integration process between the components is mostly welding, such as welding fixation of the busbar and the battery core.

[0003] Among them, the contact head of the spring piece structure is in a relatively independent state, so that its contact area with the battery core is in a multi-point distribution in actual use, which leads to a small actual contact area, which may increase the contact resistance during large current transmission and affect the current transmission between the battery core and the busbar. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of battery spring piece and the battery module containing it, to solve the problem that the contact area of spring piece structure in prior art is small, which may increase the contact resistance during large current transmission.

[0005] To solve the above technical problems, the utility model adopts the technical scheme to provide a kind of battery spring piece, the battery spring piece includes: base disc, touch disc and multiple elastic pieces.

[0006] The base disc is provided with the first through hole along the first direction through the base disc;The touch disc is spaced apart from the base disc along the first direction;Multiple elastic pieces are located in the first through hole, wherein one end of multiple elastic pieces is circumferentially arranged on the inner ring side of the base disc, and the other end is connected with the outer circumferential side of the touch disc.

[0007] The technical scheme provided by the utility model compared with prior art brings the beneficial effects of:

[0008] By using the battery spring as a contact conductive element to contact the battery cell, the conduction of the power of the battery cell can be realized by replacing the welding mode to facilitate the disassembly and maintenance of the battery after the subsequent battery forming. The contact disc of the battery spring is used to contact the end side of the battery to ensure the transmission of the current. The base disc serves as a supporting structure of the battery spring and is connected to the contact disc through the elastic member to ensure that the battery spring can still maintain stable contact performance in a vibrating environment and avoid poor contact or open circuit phenomenon caused by vibration.

[0009] Compared with the current conventional spring structure which sets multiple independent contact points, the structure of the above-mentioned multiple elastic members and the contact disc can increase the connection area with the end of the battery, significantly reduce the contact resistance, and improve the current transmission efficiency, so that it is more suitable for the transmission of large current (such as more suitable for electric vehicle lithium battery scenes). The design that the multiple elastic members are respectively connected to the contact disc and the base disc enables the battery spring to have relatively better elastic buffering capacity and is not easy to deform as a whole.

[0010] In some embodiments, the elastic member is in an S-shaped bending shape. The S-shaped bending shape of the elastic member structure design enables the elastic member to uniformly distribute stress when stressed, reduces stress concentration phenomenon, and further improves the elastic buffering capacity of the battery spring.

[0011] In some embodiments, the base disc further comprises a concave ring, wherein the concave ring is located on the outer ring side of the base disc. Since the battery spring also needs to be welded to the circuit board (described below as the substrate) in some application scenarios, the concave ring added to the outer edge of the base disc can form a sunken step design to facilitate positioning during welding.

[0012] In some embodiments, the contact disc is further provided with a second through hole penetrating through the contact disc along the first direction. That is, the contact disc is arranged in a ring structure, so that it can still maintain stable contact performance in a vibrating or impacted state and realize uniform distribution of current.

[0013] In some embodiments, the base material of the base disc, the contact disc and the elastic member is an elastic conductive material to meet the comprehensive needs of the battery spring in terms of high elasticity, high conductivity and mechanical stability.

[0014] In some embodiments, the application also provides a battery module comprising a plurality of the above-mentioned battery springs, further comprising: a battery cell module and a battery cell connecting assembly.

[0015] The battery cell module comprises a battery support and a plurality of battery cells embedded in the battery support; the battery cell connecting assembly is electrically connected to the battery cell module and is provided with a substrate and a plurality of welding holes penetrating through the substrate along a first direction, wherein the battery spring is sequentially embedded in the welding hole and connected to the substrate.

[0016] With the above technical scheme, when the plurality of battery spring sheets are fixed on the substrate through the welding holes, the combination of the battery cell module and the battery cell connecting assembly is facilitated, the end portion of any battery cell in the battery cell module can be in corresponding contact with the battery spring sheet, and electrical connection between the battery cells in the battery module is realized.

[0017] The plurality of battery spring sheets are welded to the welding holes of the battery cell connecting assembly, which can improve the stability of the battery connecting assembly, so that when the battery module vibrates or falls, the elastic member of the battery spring sheet can buffer the battery cell connecting assembly and disperse stress, thereby avoiding the fracture of the connection between the base plate and the substrate. In addition, through the connection of the battery cell connecting assembly and the battery cell module, when the battery module is disassembled, the battery cell can be separated without damaging the welding position, thereby reducing the maintenance difficulty and cost of the battery module.

[0018] In some embodiments, the battery cell module includes a first battery cell module and a second battery cell module arranged at intervals along the first direction, and the battery cell connecting assembly includes a first battery cell connecting assembly, a second battery cell connecting assembly, and a third battery cell connecting assembly arranged at intervals with the first battery cell module and the second battery cell module, respectively; wherein the second battery cell connecting assembly is located between the adjacent first battery cell module and the second battery cell module.

[0019] With the above technical scheme, the first battery cell connecting assembly realizes the output of the total positive and total negative of the battery module, the second battery cell connecting assembly realizes the series connection of the first battery cell module and the second battery cell module, and the third battery cell connecting assembly realizes the horizontal flow of the battery cell, thereby realizing the series and parallel connection between the plurality of battery cells in the battery module.

[0020] Further, the battery spring sheets are symmetrically arranged on both sides of the welding hole of the second battery cell connecting assembly. Since the second battery cell connecting assembly is located between the adjacent two battery cell modules, both sides thereof are used for connecting with the end portion of the battery cell, and therefore the two surfaces in contact with the battery cell are attached with the battery spring sheets.

[0021] In some embodiments, the battery module further includes a plurality of screw rods, wherein the battery cell connecting assembly is provided with screw holes capable of cooperating with the screw rods, so that the screw rods can sequentially penetrate the battery cell module and the battery cell connecting assembly along the first direction. The fastening of the battery module by the screw rods can simplify the overall assembly process while ensuring the mechanical strength of the battery module, thereby reducing the production cost and the subsequent disassembly difficulty.

[0022] Further, the battery module includes a first end plate and a second end plate located on both sides of the battery cell module along the first direction, wherein the screw rod extends along the first end plate to the second end plate.

[0023] By adopting the technical scheme, the plurality of battery cell modules and the battery cell connecting assembly are fixed in sequence by the plurality of screws, and the plurality of battery cells are clamped and fixed by the first end plate, the second end plate and the battery support of the battery cell module to integrate into a battery module, so that the stability of the battery module is ensured, and displacement of the battery cell during use is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort, and the drawings are as follows:

[0025] Figure 1 is a perspective structural schematic view of one embodiment of the battery spring sheet provided by the present application;

[0026] Figure 2 is a top view of one embodiment of the battery spring sheet provided by the present application;

[0027] Figure 3 is a sectional view of one embodiment of the battery spring sheet provided by the present application;

[0028] Figure 4 is a perspective structural schematic view of one embodiment of the battery module provided by the present application;

[0029] Figure 5 is an exploded view of one embodiment of the battery module provided by the present application;

[0030] Figure 6 is a perspective structural schematic view of one embodiment of the battery cell connecting assembly of the battery module provided by the present application;

[0031] Figure 7 is a perspective structural schematic view of one embodiment of the third battery cell connecting assembly of the battery module provided by the present application;

[0032] Figure 8 is a side view of one embodiment of the second battery cell connecting assembly of the battery module provided by the present application;

[0033] Figure 9 is a partial sectional view of one embodiment of the second battery cell connecting assembly of the battery module provided by the present application.

[0034] In the drawings:

[0035] 1. Battery spring; 10. Base plate; 100. First through hole; 101. Concave ring; 11. Contact plate; 110. Second through hole; 12. Elastic element;

[0036] 2. Battery module; 20. Cell module; 200. Battery bracket; 201. Cell; 202. First cell module; 203. Second cell module; 21. Cell connection assembly; 210. Substrate; 211. Weld hole; 212. First cell connection assembly; 213. Second cell connection assembly; 214. Third cell connection assembly; 215. Screw hole; 216. Sampling probe; 22. Screw; 23. First end plate; 24. Second end plate. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0038] For ease of subsequent description, before describing the specific structure of the battery spring 1 and the battery module 2 containing it, this application will first combine... Figure 1 A first direction (X) is defined, which represents the thickness direction of the battery spring 1 when it is normally placed, and also the length direction of the battery module 2 when it is in normal use. It is understood that, in order to maintain a consistent reference standard, this application uses itself as the reference point to ensure that the descriptions of all structures and components are based on the same coordinate system, thereby improving the accuracy and consistency of the descriptions.

[0039] See Figures 1 to 3 As shown, Figure 1 This paper shows a three-dimensional structural schematic diagram of an embodiment of a battery spring 1 provided in this application; Figure 2 A top view of an embodiment of a battery spring 1 provided in this application is shown; Figure 3 A cross-sectional view of an embodiment of a battery spring 1 provided in this application is shown.

[0040] In some embodiments, the battery spring 1 includes: a base plate 10, a contact plate 11, and a plurality of elastic elements 12. The base plate 10 is provided with a first through hole 100 extending through the base plate 10 in a first direction; the contact plate 11 is spaced apart from the base plate 10 in the first direction; the plurality of elastic elements 12 are located in the first through hole 100, wherein one end of the plurality of elastic elements 12 is circumferentially arranged around the inner ring side of the base plate 10, and the other end is connected to the outer peripheral side of the contact plate 11.

[0041] In the embodiments of the present application, the battery spring 1 is used as a contact conductive element to contact the battery cell 201, replacing the current welding process (such as welding and fixing the battery cell 201 to the busbar) to realize the conduction of the power of the battery cell 201, and facilitating the disassembly and maintenance of the battery after the battery is formed. Among them, the contact disc 11 of the battery spring 1 is used to contact the battery end side to ensure the current transmission between the battery cell 201 and other components, and the base disc 10 is used as the supporting structure of the battery spring 1, which can be connected and integrated with other components (such as the substrate 210 described below). The elastic member 12 is arranged between the base disc 10 and the contact disc 11 to ensure that the battery spring 1 can still maintain stable contact performance in a vibrating environment, avoiding poor contact or open circuit phenomenon caused by vibration.

[0042] As shown in Figure 3 , the elastic member 12 is S-shaped and bent, so that the elastic member 12 can uniformly distribute stress when stressed, reducing stress concentration phenomenon, thereby further improving the elastic buffering capacity of the battery spring 1. As shown in Figure 1 and 2 , when the battery spring 1 is deformed, the elastic member 12 can still contact the end of the battery cell 201. Among them, the bending angle of the elastic member 12 is not limited in the present application, for example, the elastic member 12 can also be bent into a wave shape.

[0043] Compared with the current common spring structure which sets multiple independent contact points, the structure of the multiple elastic members 12 and the contact disc 11 can increase the connection area with the battery end, significantly reduce the contact resistance between the battery cell 201 and the battery spring 1, improve the current transmission efficiency, and make it more suitable for large current transmission (such as more suitable for electric vehicle lithium batteries, etc.). And the design that the multiple elastic members 12 are respectively connected to the contact disc 11 and the base disc 10 makes the battery spring 1 have relatively better elastic buffering capacity and is not easy to deform as a whole.

[0044] In some embodiments, as shown in Figure 3 , the base disc 10 further comprises a concave ring 101, wherein the concave ring 101 is located on the outer side of the base disc 10. Since the battery spring 1 also needs to be welded to the circuit board (such as the substrate 210 described below) in some application scenarios, the concave ring 101 is added to the outer edge of the base disc 10 to form a sunken step design, which facilitates positioning during welding.

[0045] In some embodiments, the contact disc 11 is further provided with a second through hole 110 penetrating the contact disc 11 in the first direction. That is, the contact disc 11 is arranged in a ring structure, so that it can still maintain stable contact performance in a vibrating or impacted state, and realize uniform distribution of current.

[0046] In some embodiments, the base plate 10, the contact plate 11 and the base material of the elastic member 12 are all made of an elastic conductive material to meet the comprehensive requirements of the battery spring 1 in high elasticity, high conductivity and mechanical stability. Exemplarily, the elastic conductive material can be copper, silver, aluminum, copper alloy and the like, wherein the copper alloy has excellent conductivity, thermal conductivity, elasticity, fatigue resistance and corrosion resistance, and is more suitable for the structure of the battery spring 1.

[0047] Referring to Figures 4 to 6 as shown, Figure 4 a perspective structural schematic view of an embodiment of a battery module 2 provided by the present application is shown; Figure 5 an exploded view of an embodiment of a battery module 2 provided by the present application is shown; Figure 6 a perspective structural schematic view of an embodiment of a cell connecting assembly 21 of a battery module 2 provided by the present application is shown.

[0048] In some embodiments, the present application further provides a battery module 2 comprising a plurality of the above-mentioned battery springs 1, and further comprising a cell module 20 and a cell connecting assembly 21.

[0049] The cell module 20 comprises a battery support 200 and a plurality of cells 201 embedded in the battery support 200; the cell connecting assembly 21 is electrically connected to the cell module 20 and is provided with a substrate 210 and a plurality of welding holes 211 penetrating through the substrate 210 in a first direction, wherein the battery spring 1 is sequentially embedded in the welding hole 211 and connected to the substrate 210.

[0050] In the embodiments of the present application, when the plurality of battery springs 1 are fixed on the substrate 210 through the welding holes 211, the cell module 20 and the cell connecting assembly 21 are combined, wherein the end of any cell 201 in the cell module 20 can be in corresponding contact with the battery spring 1, so as to realize the electrical connection between the cells 201 in the battery module 2.

[0051] Exemplarily, the plurality of battery springs 1 are welded to the welding holes 211 of the cell connecting assembly 21, which can improve the stability of the battery connecting assembly, so that when the battery module 2 is vibrated or dropped, the elastic member 12 of the battery spring 1 can buffer and disperse the stress of the cell connecting assembly 21, thereby avoiding the fracture of the connection between the base plate 10 and the substrate 210. In addition, through the connection between the cell connecting assembly 21 and the cell module 20, when the battery module is disassembled, the cells 201 can be separated without damaging the welding position, thereby reducing the difficulty and cost of the maintenance of the battery module.

[0052] In some embodiments, the battery cell module 20 includes a first battery cell module 202 and a second battery cell module 203 arranged in the first direction, and the battery cell connecting assembly 21 includes a first battery cell connecting assembly 212, a second battery cell connecting assembly 213 and a third battery cell connecting assembly 214 arranged between the first battery cell module 202 and the second battery cell module 203, respectively.

[0053] Exemplarily, as shown in Figure 4 , Figure 4 The arrow indicates the flow of current, and specifically, the first battery cell connecting assembly 212 is used to realize the output busbar of the total positive and total negative of the battery module 2, the second battery cell connecting assembly 213 is used to realize the series conduction of the first battery cell module 202 and the second battery cell module 203, and the third battery cell connecting assembly 214 is used to realize the transverse conduction of the battery cell 201, thereby realizing the series and parallel connection between the plurality of battery cells 201 in the battery module 2.

[0054] In the present application, the number of battery cell modules 20 is not limited, for example Figure 5 Two groups of battery cell modules 20 (the first battery cell module 202 and the second battery cell module 203) are shown in the embodiment, but the number of battery cell modules 20 can be adjusted according to the actual application scenario, such as adding a third group, a fourth group, etc., and the battery cell connecting assembly 21 located between the two adjacent groups of battery cell modules 20 is the second battery cell connecting assembly 213.

[0055] In some embodiments, the battery module 2 further includes a plurality of screws 22, wherein the battery cell connecting assembly 21 is provided with screw holes 215 capable of cooperating with the screws 22, so that the screws 22 can sequentially penetrate the battery cell module 20 and the battery cell connecting assembly 21 in the first direction. The fastening of the battery module 2 by the screw 22 can ensure the mechanical strength of the battery module 2 while simplifying the overall assembly process, reducing production costs and reducing the difficulty of subsequent disassembly.

[0056] Further, the battery module 2 includes a first end plate 23 and a second end plate 24 located on both sides of the battery cell module 20 in the first direction, wherein the screw 22 extends from the first end plate 23 to the second end plate 24.

[0057] In the embodiment of the present application, the plurality of battery cell modules 20 and the battery cell connecting assembly 21 are sequentially fixed by the plurality of screws 22, and the plurality of battery cells 201 are clamped and fixed by the first end plate 23 and the second end plate 24 and the battery support 200 of the battery cell module 20, so as to be integrated into the battery module 2, thereby ensuring the stability of the battery module 2 and preventing the displacement of the battery cell 201 during use.

[0058] Exemplarily, as shown in Figure 7 ,Figure 7 A perspective structural schematic diagram of an embodiment of a third cell connecting assembly 214 of a battery module 2 provided by the present application is shown. For example, the first cell module 202 and the second cell module 203 are each provided with 10 cells 201. Taking the first cell module 202 as an example, the 10 cells 201 can be divided into two groups, and the battery spring sheets 1 connected therewith are divided into five groups as shown in the figure. Figure 7 The five groups of cells 201 are selected and the other five groups of cells 201 are not selected. The third cell connecting assembly is used to guide the current of the five groups of cells 201 to the other five groups of cells 201 in the direction of the arrow as shown, so that the battery module 2 can form a U-shaped loop. Figure 7 Exemplarily, the cell connecting assembly 21 can also be provided with a sampling probe 216, which can be used in cooperation with a current detection circuit to convert the current signal into a voltage signal for measurement by detecting a resistor or a differential amplifier and the like, so as to detect the current state of the substrate 210, wherein the substrate 210 can be a circuit board.

[0059] Referring to Figures 8 to 9 as shown, Figure 8 A side view of an embodiment of a second cell connecting assembly 213 of a battery module 2 provided by the present application is shown. Figure 9 A partial cross-sectional view of an embodiment of a second cell connecting assembly 213 of a battery module 2 provided by the present application is shown.

[0060] In some embodiments, the second cell connecting assembly 213 is provided with battery spring sheets 1 symmetrically on both sides of the welding hole 211. Since the second cell connecting assembly 213 is located between two adjacent cell modules 20, both sides thereof are used to connect with the end of the cell 201, and therefore both surfaces thereof in contact with the cell 201 are provided with battery spring sheets 1.

[0061] The above only describes the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, which is based on the content of the present application specification and drawings, should be within the protection scope of the present application.

Claims

1. A battery spring, characterized in that, include: Base plate, the base plate having a first through hole extending through the base plate in a first direction; A contact plate, wherein the contact plate is spaced apart from the base plate along the first direction; Multiple elastic elements are located in the first through hole, wherein one end of each elastic element is circumferentially arranged around the inner ring side of the base plate, and the other end is connected to the outer peripheral side of the contact plate.

2. The battery spring according to claim 1, characterized in that, The elastic element is S-shaped.

3. The battery spring according to claim 1, characterized in that, The base disk further includes a concave ring, wherein the concave ring is located on the outer ring side of the base disk.

4. The battery spring according to claim 1, characterized in that, The contact plate is also provided with a second through hole that extends through the contact plate along the first direction.

5. The battery spring according to any one of claims 1 to 4, characterized in that, The substrates of the base plate, the contact plate, and the elastic element are made of elastic conductive material.

6. A battery module, characterized in that, The battery spring sheet includes any one of claims 1 to 5, and further includes: A battery cell module, the battery cell module including a battery bracket and a plurality of battery cells embedded in the battery bracket; A cell connection assembly is electrically connected to the cell module and has a substrate and a plurality of solder holes penetrating the substrate along a first direction, wherein the battery springs are sequentially embedded in the solder holes and connected to the substrate.

7. The battery module according to claim 6, characterized in that, The battery cell module includes a first battery cell module and a second battery cell module spaced apart along the first direction. The battery cell connection assembly includes a first battery cell connection assembly, a second battery cell connection assembly, and a third battery cell connection assembly respectively arranged alternately with the first battery cell module and the second battery cell module; wherein, the second battery cell connection assembly is located between adjacent first battery cell modules and second battery cell modules.

8. The battery module according to claim 7, characterized in that, The battery springs are symmetrically arranged on both sides of the welding hole of the second cell connection assembly.

9. The battery module according to claim 6, characterized in that, The battery module also includes multiple screws, wherein the cell connection assembly is provided with screw holes that can cooperate with the screws, so that the screws can sequentially pass through the cell module and the cell connection assembly along the first direction.

10. The battery module according to claim 9, characterized in that, The battery module includes a first end plate and a second end plate located on both sides of the cell module along the first direction, wherein the screw extends along the first end plate to the second end plate.

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