CN211957712U

CN211957712U - Laminate polymer battery module

Info

Publication number: CN211957712U
Application number: CN201922399888.1U
Authority: CN
Inventors: 张雄军; 李佛; 周浩; 姚德林; 杨新林; 赵成; 吴首雄; 朱佐鑫; 李龙; 蒋旺
Original assignee: Hunan Dianjiangjun New Energy Co ltd
Current assignee: Hunan Dianjiangjun New Energy Co ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-11-17
Anticipated expiration: 2029-12-27

Abstract

The utility model discloses a soft package battery module, which comprises an electric core, a bracket and a fixed plate, wherein the electric core is fixedly arranged in a space formed by the bracket and the fixed plate; the battery cell comprises a plurality of battery cell units arranged in parallel, each battery cell unit comprises a battery cell body and a battery cell lug, and a buffer layer for buffering pressing force between the battery cell bodies is arranged between every two adjacent battery cell bodies; the fixed plate comprises a side fixed plate, the side fixed plate comprises a group of U-shaped fixed plates which are matched with each other, and the U-shaped fixed plates are fixedly connected through an adjustable fastening device for adjusting pressing force between the cell bodies. The utility model discloses in place the buffer layer between two adjacent electric core bodies, in battery recycling use, the buffer layer can allow to have certain inflation space between the electric core body, prevents to cause the constraining force sharply-increased of pre-compaction fixed knot structure because of the inflation of electric core body, leads to the obvious decline of battery performance.

Description

Laminate polymer battery module

Technical Field

The utility model belongs to the new forms of energy field especially relates to a battery module.

Background

With the rapid development of electric bicycles and the requirement and planning of new energy development by the state, in new energy application, a lithium ion battery is mostly adopted as an electric energy storage device, and the lithium ion battery can have practical value at the present stage. Because the soft package battery has the characteristics of the soft package battery, the soft package lithium ion battery module generally adopts a stacking mode to form the module, certain force is applied to the stacked battery in the module to compress the battery, and the soft package lithium ion battery module is mainly used for restraining the battery. If the pressure is too small, the battery is easily damaged when the battery vibrates with the vehicle body; too large may negatively impact the life of the battery. Further, a large pressure causes a large capacity fade rate due to the loss of circulating lithium ions. In addition, excessive stack pressure can also lead to local deformation of the diaphragm and chemical degradation. In addition, the thickness of lithium batteries increases by about 1.2% when the battery capacity varies from 0-100%. From these research results, the external pressure of the lithium battery has a significant influence on the performance of the battery. Therefore, when the soft package lithium ion battery module structure is designed, the proper pressure applied to the battery must be considered.

There are generally two approaches to the grouping of pouch cells. The method is characterized in that fixing supports and single battery cells are arranged alternately, a frame of each fixing support is designed to be fastened with a stress mechanism, a certain number of repeating units and end sealing plates are arranged to form a module, and the module is mounted in a power battery box to form a battery PACK. The other method is to arrange a certain number of single battery cells in order in a groove-shaped battery box, wherein the battery box is provided with a cover plate, and battery tabs penetrate out of the cover plate and are connected in parallel or in series, but the operation of putting the arranged single battery cells into the battery box in the assembly process is difficult.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome not enough and the defect mentioned in the above background art, provide a laminate polymer battery module that piles up pressure suitable, easily assembly. In order to solve the technical problem, the utility model provides a technical scheme does:

a soft package battery module comprises an electric core, a bracket and a fixed plate, wherein the electric core is fixedly arranged in a space formed by the bracket and the fixed plate; the battery core comprises a plurality of battery core units arranged in parallel (sequentially staggered in the thickness direction of the battery), each battery core unit comprises a battery core body and a battery core lug, and a buffer layer for buffering pressing force between the battery core bodies is arranged between every two adjacent battery core bodies; the fixed plate comprises a side fixed plate, the side fixed plate comprises a group of U-shaped fixed plates which are matched with each other, and the U-shaped fixed plates are fixedly connected through an adjustable fastening device for adjusting pressing force between the cell bodies.

In the above soft package battery module, preferably, the buffer layer is an elastic cotton layer with an elastic deformation of 30-50%, and the thickness of the elastic cotton layer is 0.5-1.5 mm. The thickness and the elastic cotton layer can ensure the play of the function of the buffer layer.

In the above-mentioned laminate polymer battery module, preferably, be equipped with the division board in the clearance between electric core and the U-shaped fixed plate. The division board can effectively protect the damage to the battery cell in the assembling process.

Among the above-mentioned laminate polymer battery module, preferred, a set of the U-shaped fixed plate is including the big U fixed plate and the little U fixed plate of mutually supporting, the bottom of big U fixed plate is equipped with the fixed ear to the inside extension of big U fixed plate, the fixed plate still includes the bottom plate, the bottom plate passes through fixed ear with the connection can be dismantled to the side fixed plate.

Among the above-mentioned laminate polymer battery module, preferably, adjustable fastener includes fastening nut and pressure riveting screw, the pressure riveting screw set firmly in on one of them U-shaped fixed plate of side fixed plate, the corresponding fixed opening that is used for the pressure riveting screw to pass that is equipped with on another U-shaped fixed plate, the adjustable soon of fastening nut position is located on the pressure riveting screw.

In the above-mentioned laminate polymer battery module, preferably, be equipped with the buckle on the lateral wall of support, set up on the fixed plate be used for with buckle matched with draw-in groove. The buckle and the clamping groove fixing support and the fixing plate are more easily assembled and disassembled integrally.

Among the above-mentioned laminate polymer battery module, preferably, set up a plurality of through-holes that are used for electric core utmost point ear to pass on the support, the both sides downwardly extending of through-hole is equipped with and is used for making things convenient for electric core utmost point ear to insert a pair of guide wall of through-hole, the guide wall slope sets up, and is a pair of clearance between the guide wall is big end down's wedge. The utility model provides a support through-hole department downwardly extending is equipped with the guide wall, utilizes the utility model discloses a when support group equipment electric core, the back has been arranged to a plurality of electric cores, because the existence of guide wall, during all electric core utmost point ears can once only insert the through-hole, simplifies the assembling process of electric core greatly, simplifies electric core group technology, reduces the equipment degree of difficulty.

In the pouch battery module, preferably, the inclination angle θ of the guide wall is 10 to 30 °. The size of the angle is related to the top edge sealing width of the battery cell and the thickness of the battery cell, and various factors are considered comprehensively, so that the optimal angle is determined to be 10-30 degrees.

In the above-mentioned laminate polymer battery module, preferably, the guide wall is the wedge that big end down is little, and adjacent a pair of the outer wall of guide wall sets up vertically downwards. The arrangement mode can ensure that the gap between the adjacent pair of guide walls is regular and square, and the battery cell tabs can conveniently penetrate through the through holes and then be fixed between the battery cell and the support. If the filling foam is directly inserted into the regular square, the regular square is beneficial to the disassembly and the assembly of the foam, the shape of the adopted foam is more regular, and the processing and the manufacture of the foam are also beneficial.

In the utility model, firstly, the cell units and the buffer layer are arranged to obtain the cell, the bottom plate is arranged in the large U-shaped fixed plate, and the isolation plate is arranged; then, the battery cell is placed in a large U fixing plate, and the large U fixing plate plays a role in prepressing, fixing and protecting the battery cell; installing the support on the top of the battery cell to make the support restrain the battery cell from the top of the battery cell; and finally, installing a small U-shaped fixing plate, and adjusting pre-compression force between the large U-shaped fixing plate and the small U-shaped fixing plate through an adjustable fastening device to realize omnibearing fixing of the battery cell. The fixing mode of the battery cell has the advantages of convenience in assembly and fixation and the like.

Compared with the prior art, the utility model has the advantages of:

1. the utility model discloses in place the buffer layer between two adjacent electric core bodies, in battery recycling use, the buffer layer can allow to have certain inflation space between the electric core body, prevents to cause the constraining force sharply-increased of pre-compaction fixed knot structure because of the inflation of electric core body, leads to the obvious decline of battery performance.

2. The utility model discloses well adoption a set of U-shaped fixed plate of mutually supporting is as the side fixed plate, through adjustable fastener rigid coupling between a set of U-shaped fixed plate, can conveniently realize the regulation of fixed plate to electric core packing force. The fixing form is matched with the buffer layer, and the effect is better.

3. The utility model provides a laminate polymer battery module simple structure, easily production is favorable to extensive popularization and application.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a pouch battery module in an embodiment.

Fig. 2 is a partially exploded view of fig. 1 (not shown with a wiring harness).

Fig. 3 is a schematic structural diagram of a cell unit in the embodiment.

Fig. 4 is a schematic structural view of a large U-shaped fixing plate in the embodiment.

FIG. 5 is a top view of the bracket of the embodiment.

Fig. 6 is a cross-sectional view taken along plane a-a of fig. 5.

FIG. 7 is a side view of the stent in the example.

Illustration of the drawings:

1. a support; 21. a side fixing plate; 211. a large U-shaped fixing plate; 212. a small U-shaped fixing plate; 213. fixing the ear; 22. a base plate; 3. a cell unit; 31. a cell body; 32. a battery core tab; 4. a buffer layer; 5. an adjustable fastening device; 51. fastening a nut; 52. pressing and riveting the screw; 6. a separator plate; 7. buckling; 8. a card slot; 9. a through hole; 10. a guide wall; s1, outer wall.

Detailed Description

To facilitate understanding of the present invention, the present invention will be described more fully and specifically with reference to the accompanying drawings and preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below.

Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.

Example (b):

as shown in fig. 1 to 4, the soft package battery module of this embodiment includes a battery cell, a bracket 1 and a fixing plate, where the battery cell is fixedly disposed in a space formed by the bracket 1 and the fixing plate; the battery cell comprises a plurality of battery cell units 3 arranged in parallel, each battery cell unit 3 comprises a battery cell body 31 and a battery cell lug 32, and a buffer layer 4 for buffering pressing force between the battery cell bodies 31 is arranged between every two adjacent battery cell bodies 31; the fixed plate includes side fixed plate 21, and side fixed plate 21 includes a set of U-shaped fixed plate of mutually supporting, through the adjustable fastener 5 rigid coupling that is used for adjusting the packing force between the electric core body 31 between a set of U-shaped fixed plate.

In this embodiment, the cushion layer 4 is an elastic cotton layer having an elastic deformation amount of 30 to 50% (any of the above ranges), and the thickness of the elastic cotton layer is 0.5 to 1.5mm (any of the above ranges, preferably 1 mm).

In this embodiment, a separation plate 6 is disposed in a gap between the battery cell and the U-shaped fixing plate.

In this embodiment, a set of U-shaped fixed plate includes big U fixed plate 211 and little U fixed plate 212 that mutually support, and the bottom of big U fixed plate 211 is equipped with the fixed ear 213 to the inside extension of big U fixed plate 211, and the fixed plate still includes bottom plate 22, and bottom plate 22 passes through fixed ear 213 and can dismantle with side fixed plate 21 and be connected.

In this embodiment, the adjustable fastening device 5 includes a fastening nut 51 and a rivet pressing screw 52, the rivet pressing screw 52 is fixedly disposed on one of the U-shaped fixing plates of the side fixing plate 21, a fixing opening for the rivet pressing screw 52 to pass through is correspondingly disposed on the other U-shaped fixing plate, and the fastening nut 51 is rotatably disposed on the rivet pressing screw 52 in an adjustable position.

In this embodiment, be equipped with buckle 7 on the lateral wall of support 1, set up on the fixed plate and be used for with buckle 7 matched with draw-in groove 8.

As shown in fig. 5 to 7, in this embodiment, the support 1 is provided with a plurality of through holes 9 for the battery cell tabs 32 to pass through, two sides of each through hole 9 extend downward to be provided with a pair of guide walls 10 for facilitating the battery cell tabs 32 to be inserted into the through holes 9, the guide walls 10 are arranged in an inclined manner, and a gap between the pair of guide walls 10 is a wedge shape with a small top and a large bottom.

In the present embodiment, the guide wall 10 is inclined at an angle θ of 10 to 30 ° (any of the above ranges).

In this embodiment, the guide walls 10 are wedge-shaped with a large top and a small bottom, and the outer walls S1 of an adjacent pair of guide walls 10 are disposed vertically downward.

When the support in this embodiment is utilized to assemble the laminate polymer battery module, the battery cells are arranged as required, and then the battery cell tabs 32 of all the battery cells are aligned to the gaps between the corresponding pair of guide walls 10 and pass through the gaps, so that the current collecting sheet on the support 1 and the battery cell tabs 32 of the adjacent battery cells are connected, and the assembly process is easier.

Claims

1. The soft package battery module is characterized by comprising an electric core, a support (1) and a fixing plate, wherein the electric core is fixedly arranged in a space formed by the support (1) and the fixing plate; the battery core comprises a plurality of battery core units (3) which are arranged in parallel, each battery core unit (3) comprises a battery core body (31) and a battery core lug (32), and a buffer layer (4) for buffering pressing force between the battery core bodies (31) is arranged between every two adjacent battery core bodies (31); the fixing plate comprises a side fixing plate (21), the side fixing plate (21) comprises a group of U-shaped fixing plates which are matched with each other, and the U-shaped fixing plates are fixedly connected through an adjustable fastening device (5) for adjusting pressing force between the cell bodies (31).

2. The laminate battery module according to claim 1, wherein the buffer layer (4) is an elastic cotton layer with elastic deformation of 30-50%, and the thickness of the elastic cotton layer is 0.5-1.5 mm.

3. The laminate battery module according to claim 1 or 2, characterized in that a separation plate (6) is arranged in the gap between the battery core and the U-shaped fixing plate.

4. The laminate battery module as claimed in claim 1 or 2, wherein one set of the U-shaped fixing plates comprises a large U fixing plate (211) and a small U fixing plate (212) which are matched with each other, the bottom of the large U fixing plate (211) is provided with a fixing lug (213) which extends towards the inside of the large U fixing plate (211), the fixing plate further comprises a bottom plate (22), and the bottom plate (22) is detachably connected with the side fixing plate (21) through the fixing lug (213).

5. The soft-package battery module according to claim 1 or 2, wherein the adjustable fastening device (5) comprises a fastening nut (51) and a rivet pressing screw (52), the rivet pressing screw (52) is fixedly arranged on one U-shaped fixing plate of the side fixing plates (21), a fixing opening for the rivet pressing screw (52) to pass through is correspondingly arranged on the other U-shaped fixing plate, and the fastening nut (51) is screwed on the rivet pressing screw (52) in an adjustable position.

6. The soft package battery module according to claim 1 or 2, wherein a buckle (7) is arranged on the side wall of the bracket (1), and a clamping groove (8) matched with the buckle (7) is formed in the fixing plate.

7. The soft package battery module according to claim 1 or 2, wherein the support (1) is provided with a plurality of through holes (9) for the cell tabs (32) to pass through, two sides of each through hole (9) extend downwards to form a pair of guide walls (10) for facilitating the insertion of the cell tabs (32) into the through holes (9), the guide walls (10) are arranged in an inclined manner, and a gap between the pair of guide walls (10) is in a wedge shape with a small top and a large bottom.

8. The pouch battery module according to claim 7, wherein the guide wall (10) has an inclination angle θ of 10-30 °.

9. The pouch battery module according to claim 7, wherein the guide walls (10) are wedge-shaped with a large top and a small bottom, and the outer walls (S1) of an adjacent pair of the guide walls (10) are vertically downwardly disposed.