CN210897447U

CN210897447U - Manifold sheet and battery module with same

Info

Publication number: CN210897447U
Application number: CN201921096046.2U
Authority: CN
Inventors: 殷玉婷; 关云来; 顾江娜; 李相哲; 许玉林; 王爱淑
Original assignee: Suzhou Ankao Energy Co Ltd
Current assignee: Suzhou Ankao Energy Co Ltd
Priority date: 2019-07-12
Filing date: 2019-07-12
Publication date: 2020-06-30
Anticipated expiration: 2029-07-12

Abstract

The application discloses converge piece and dispose battery module of this converge piece, the area of overflowing of each part is positive correlation with overflowing the size on the converge piece. The problem of each electric core difference in temperature in the battery module has been solved because of the piece that converges self temperature homogeneity is poor to this application.

Description

Manifold sheet and battery module with same

Technical Field

The present invention relates to a bus bar and a battery module equipped with the same.

Background

In a battery pack formed of cylindrical battery modules, it is necessary to connect the small battery modules in the module with bus bars.

Joule heat is generated by the current flowing through the bus bar, and the temperature of the bus bar rises. Due to the structural limitation of the bus bar, the uneven current distribution on the bus bar may cause uneven temperature distribution on the bus bar. Because the battery core lug connection in confluence piece and the module, the inhomogeneous temperature can influence the temperature field of battery to also make the temperature of battery inhomogeneous.

Disclosure of Invention

The purpose of the application is: in view of the above problems, a bus bar and a battery module with the bus bar are provided to solve the problem of increasing the temperature difference between each battery cell in the battery module due to the poor temperature uniformity of the bus bar.

The technical scheme of the application is as follows:

the flow area and the flow size of each part on the bus sheet are positively correlated.

On the basis of the technical scheme, the application also comprises the following preferable scheme:

the bus bar includes:

a collector section, and

the flow guide sections are integrally connected to the side edges of the flow collecting sections and are arranged in an isolated mode;

the current collecting section and the current guiding section are respectively provided with at least two electric core welding parts used for connecting the positive pole/negative pole of the electric core, and the sectional area of the current guiding section is smaller than that of the current collecting section.

The current-collecting section comprises at least two current-collecting sections which are sequentially arranged along the direction far away from the current-collecting section, each current-collecting section is provided with two electric core welding parts, and the sectional area of each current-collecting section is sequentially reduced along the direction far away from the current-collecting section.

The drainage sections are symmetrically arranged on the left side and the right side of the flow collecting section.

The bus bar sheet has a uniform thickness dimension.

A battery module comprising a first battery module and a second battery module, said first and second battery modules each comprising:

a battery support which is provided with a plurality of battery cell inserting holes distributed in a matrix shape in a run-through manner, and

a plurality of battery cores which are distributed in a matrix shape;

the positive end of the battery cell in the first battery module is inserted into the battery cell insertion hole, the negative end of the battery cell in the second battery module is inserted into the battery cell insertion hole, a battery support in the first battery module and the side part of the battery support in the second battery module are attached to and arranged with the same bus bar with the structure, the bus bar is welded and fixed with the positive end of each battery cell in the first battery module, and the bus bar is welded and fixed with the negative end of each battery cell in the second battery module;

the battery cell is a cylindrical lithium ion battery cell.

The application has the advantages that:

1. the current passing area difference of each part on the bus bar is designed, so that the current passing area of each part is positively correlated with the current passing size, the current passing (cross section) area of the part on the bus bar where large current flows is large, and the current passing (cross section) area of the part on the bus bar where small current flows is small. Thereby make the homogeneity of calorific capacity and temperature everywhere of confluence piece high, solved because of the poor great problem of each electric core difference in temperature among the battery module of the homogeneity of piece self temperature of confluence.

2. According to the battery pack, the flow area difference of each part on the bus bar is designed, the bus bar is not of a complete sheet structure any more, the material consumption of the bus bar is reduced, the weight and the cost of the bus bar are reduced, and therefore the energy density of the battery pack is increased.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a self-assembly view of a battery module according to an embodiment of the present application;

fig. 2 is an exploded view of a battery module according to an embodiment of the present application;

fig. 3 is a front view of a battery module according to an embodiment of the present application;

FIG. 4 is a perspective view of a bus bar in an embodiment of the present application;

FIG. 5 is a front view of a bus bar in an embodiment of the present application;

wherein: 100-bus bar sheet, 200-battery core, 300-battery support, 101-current collecting section, 102-current guiding section, 102 a-current guiding section, 1012-battery core welding part, 301-battery core inserting hole, and L1, L2 and L3 respectively represent the length size of the corresponding part.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and the words used to indicate orientation, top, bottom, left, right, etc. are used solely to describe the illustrated structure in connection with the accompanying figures.

One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.

Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any sequence in the figures and examples is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

Fig. 1 to 5 show a preferred embodiment of such a battery module of the present application, which also includes a plurality of battery modules, only two of which are shown, a first battery module a and a second battery module b, as in the conventional battery module. The first battery module a and the second battery module b respectively include a plastic battery support 300 and a plurality of lithium ion batteries 200 (or called battery cells) with cylindrical structures, wherein the battery support 300 is provided with a plurality of battery cell insertion holes 301 distributed in a matrix shape, each battery cell 200 in each battery module is also distributed in a matrix shape, and one end of each battery cell is inserted into the battery cell insertion hole 301 of the battery support 300. Specifically, the method comprises the following steps: the positive electrode end of the battery cell 200 in the first battery module a is inserted into the cell insertion hole 201, and the negative electrode end of the battery cell 200 in the second battery module b is inserted into the cell insertion hole 201. The battery support 300 of the first battery module a and the battery support 300 of the second battery module b are arranged closely, and the side parts of the two battery supports are attached to and arranged on the same bus bar 100, the bus bar 100 is welded and fixed with the positive end of each battery cell 200 in the first battery module a, and the bus bar 100 is welded and fixed with the negative end of each battery cell 200 in the second battery module a, so that the two battery modules are connected in series.

The key improvement of this embodiment is that the overcurrent area of each part on the bus bar 100 is positively correlated with the overcurrent magnitude, that is, the larger the current flowing through a part on the bus bar 100 is, the larger the overcurrent area of the part is; the smaller the current flowing through a certain portion of the bus bar 100, the smaller the flow area of the portion.

Further, the manifold block 100 includes a manifold block 101 and a plurality of (6 in the figure) flow guide segments 102, each flow guide segment 102 is integrally connected to a side of the manifold block 101, and the flow guide segments 102 are arranged in a spaced manner from each other. The 6 flow guiding segments 102 are divided into two groups of 3 flow guiding segments, and the two groups of flow guiding segments 102 are symmetrically arranged on the left side and the right side of the collecting segment 101. The 3 drainage segments 102 on the left side are welded to the battery cell 200 of the first module a, and the 3 drainage segments 102 on the right side are welded to the battery cell 200 of the second module b. In operation, current flows from the left side current-conducting segment 102 to the middle current-collecting segment 101, and then from the current-collecting segment 101 to the right side current-conducting segment 102.

Because the current flowing through the left and right current-guiding segments 102 is smaller than the current flowing through the current-collecting segment 101, in order to ensure the uniformity of heat generation at various positions on the bus bar 100, the sectional area (i.e., the flow area) of the current-collecting segment 101 of the present embodiment is smaller than the sectional area (i.e., the flow area) of the current-collecting segment 101 of the current-collecting segment 102.

In order to facilitate the welding of the bus bar 100 to each battery cell 200, in the present embodiment, a plurality of cell welding portions 1012 for connecting the positive electrode/negative electrode of the battery cell 200 are respectively provided on the current collecting segment 101 and the current guiding segment 102.

The flow guiding segment 102 comprises two flow guiding segments 102a arranged in sequence along the direction away from the current collecting segment 101, each flow guiding segment 102a is provided with two cell welding parts 1012 (two adjacent flow guiding segments 102a share the same cell welding part 1012), and the cross-sectional area of each flow guiding segment 102a is reduced in sequence along the direction away from the current collecting segment 101.

The bus bar 100 in this embodiment has a uniform thickness dimension, i.e., the thickness of the bus bar is uniform throughout. Therefore, different flow areas can be obtained only by correspondingly and differently setting the section lengths of the parts.

Ideally, the current of each cell is the same. According to Q ═ I²Rt and

q is calorific value, I is current, R is resistance, t is time, L is material length, S is material cross-sectional area, sigma is material conductivity, if the temperature on the confluence sheet is to be kept uniform, the unit on the confluence sheet needs to be keptWith uniform volumetric heating, i.e.

Then

Referring to fig. 5, it is assumed that the current of each cell 200 is the same, I. Then the current of the collector segment 101 in the middle of the bus bar (at L1) is 9I, the current of the current leading segment 102a (at L2) near the collector segment 101 is 2I, and the current of the current leading segment 102a (at L3) far from the collector segment 101 is I, then L1: L2: L3 is 9:2: 1.

The above embodiments are only for illustrating the technical concepts and features of the present application, and the purpose of the embodiments is to enable people to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.

Claims

1. The bus bar is characterized in that the flow area of each part on the bus bar (100) is positively correlated with the flow size.

2. Bus bar according to claim 1, characterized in that the bus bar (100) comprises:

a collector segment (101), and

a plurality of flow guide sections (102) which are integrally connected to the side edges of the flow collecting section and are arranged in a mutually isolated mode;

the current collecting section (101) and the current guiding section (102) are respectively provided with at least two battery cell welding parts (1012) used for connecting the positive pole/negative pole of the battery cell (200), and the sectional area of the current guiding section (102) is smaller than that of the current collecting section (101).

3. The bus bar according to claim 2, wherein the flow guiding segment (102) comprises at least two flow guiding segments (102a) arranged in sequence in a direction away from the current collecting segment (101), wherein two cell welding parts (1012) are provided on each flow guiding segment (102a), and wherein the cross-sectional area of each flow guiding segment (102a) decreases in sequence in the direction away from the current collecting segment (101).

4. A bus bar according to claim 2 or 3, characterized in that the flow-directing segments (102) are symmetrically arranged on the left and right sides of the manifold segment (101).

5. The bus bar of claim 1, wherein the bus bar has a uniform thickness dimension.

6. A battery module comprising a first battery module (a) and a second battery module (b) each comprising:

a battery bracket (300) which is provided with a plurality of electric core inserting holes (301) distributed in a matrix shape in a run-through way, and

a plurality of battery cores (200) which are only distributed in a matrix shape;

the positive end of the battery cell (200) in the first battery module (a) is inserted into the battery cell insertion hole (301), the negative end of the battery cell (200) in the second battery module (b) is inserted into the battery cell insertion hole (301), the battery support (300) in the first battery module (a) and the side part of the battery support (300) in the second battery module (b) are attached to each other to form the same bus bar (100), the bus bar (100) is welded and fixed with the positive end of each battery cell (200) in the first battery module (a), and the bus bar (100) is welded and fixed with the negative end of each battery cell (200) in the second battery module (b);

-the bus bar (100) is according to any of claims 1 to 5.

7. The battery module according to claim 6, characterized in that the battery cells (200) are cylindrical lithium ion cells.