CN210778781U

CN210778781U - Battery module

Info

Publication number: CN210778781U
Application number: CN201920695354.0U
Authority: CN
Inventors: 娄豫皖; 许玉林; 王爱淑; 巩金瑞
Original assignee: Suzhou Ankao Energy Co Ltd
Current assignee: Suzhou Ankao Energy Co Ltd
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2020-06-16
Anticipated expiration: 2029-05-15

Abstract

The application discloses battery module, including battery holder, parallel network and series connection piece, wherein the series connection piece is the PTC material, and the circular film of parallel network and the battery holder upper battery cartridge hole annular inner flange hollow ring structure between for pressing from both sides the circular film of locating the series connection piece and battery holder, the lower arch of circular film downwards pass in proper order behind the centre bore of conducting pad and the centre bore of annular inner flange with the free positive terminal welded fastening of downside battery. This kind of battery module of this application can cut off the high temperature trouble battery monomer in it in series connection and parallelly connected direction simultaneously in the use, and the security is high.

Description

Battery module

Technical Field

The application relates to the field of batteries, in particular to a battery module.

Background

The development of the electric automobile is an important way for improving the competitiveness of the automobile industry in China, ensuring the energy safety and developing low-carbon economy, and is a core means for promoting the transformation and upgrading of the automobile manufacturing industry in China and creating China from the transition of the manufacturing in China. In recent years, with the rapid development of electric automobiles, the market of power lithium ion batteries is increasingly in demand. Throughout the development trend of electric vehicles, in order to improve the cruising ability of electric vehicles, the capacity and energy density of power batteries need to be continuously improved, and meanwhile, the safety performance of the batteries needs to be ensured.

Because the capacity of a single battery is limited, a plurality of battery cells are generally connected in series and in parallel to form a battery module for use. In a large-capacity battery module, once a certain battery (single body) is overcurrent or overheated to cause battery combustion, if corresponding power-off protection measures are not taken, the temperature of other batteries around an abnormal battery is likely to be increased rapidly, and finally, the whole module is caused to be in thermal runaway and combusted, even an explosion accident is caused, so that great economic loss is caused, and casualties can be caused in severe cases.

In order to prevent the potential safety hazard, in the prior art, low-melting-point metal is usually adopted at the serial connection position or the parallel connection position of the batteries, when the batteries are subjected to overcurrent, the temperature of the batteries and the ambient temperature of the batteries are sharply increased, and when the temperature reaches the melting point of the metal, a connection circuit between the batteries is cut off, so that the current cutoff protection effect is achieved. However, the above technical solutions can only perform the power-off protection function on the premise of the over-current when the battery is powered on, and cannot perform the effective prevention and protection function before the battery is powered on.

In response to the above-mentioned shortcomings, PTC is beginning to be used as an overcurrent or overheat protection element instead of the conventional low-melting-point metal material. Usually, a PTC (positive temperature Coefficient) overcurrent protection element is connected in series between the positive post and the positive cap inside the battery cell, and once a certain battery is subjected to overcurrent, the PTC element is automatically turned off to perform an overcurrent protection function. In the prior art, an external PTC overcurrent protection element is also adopted, the PTC is arranged at one end of the single battery, and when the battery is in overcurrent, a connecting circuit of the two modules in the serial direction is cut off. However, in both of the above solutions, the fixed direction circuit connection between some batteries and the surrounding batteries in the battery module can only be cut off.

Disclosure of Invention

The purpose of the application is: in view of the above problems, a battery module capable of simultaneously cutting off high-temperature faulty battery cells in the series and parallel directions is proposed.

The technical scheme of the application is as follows:

a battery module, comprising:

the battery support is made of insulating materials and provided with a plurality of battery inserting holes which are communicated up and down and are parallel to each other, a circle of annular inner flange which protrudes inwards in the radial direction is integrally arranged at the hole wall of each battery inserting hole, each battery inserting hole is divided into an upper hole section and a lower hole section which are positioned at two axial sides of the battery inserting hole by the annular inner flange, and a channel which is sunken downwards from the upper end surface of the battery support and radially communicates the two upper hole sections is formed between the upper hole sections of any two adjacent battery inserting holes;

the connecting plates comprise a circular bottom plate with a lower bulge and a plurality of elastic claws which are integrally connected to the outer edge of the circular bottom plate and are arranged around the circular bottom plate at intervals, the connecting plates are embedded in the upper hole section, the circular bottom plate is vertically abutted against the annular inner flange, and the lower bulge downwards penetrates through the central hole of the annular inner flange and extends into the lower hole section; and

the parallel network is composed of a plurality of conducting pads arranged at intervals and a plurality of conducting strips integrally connected among the conducting pads, the conducting pads and the conducting strips are respectively embedded in the upper hole sections and the channels, and the conducting pads are in conductive contact with the circular bottom plate;

a plurality of battery monomers are uniformly arranged on the upper side and the lower side of the battery bracket, wherein the positive end of the lower battery monomer is inserted into the lower hole section and is welded and fixed with the lower bulge, the negative end of the upper battery monomer is inserted into the upper hole section and is circumferentially surrounded by the plurality of elastic claws on the serial connection piece, and the elastic claws are radially clamped between the battery monomers and the hole wall of the upper hole section;

the series connection piece is made of PTC materials, the conducting pad is of a hollow circular ring structure clamped between the circular bottom piece and the annular inner flange, and the lower protrusion penetrates through a center hole of the conducting pad and a center hole of the annular inner flange downwards in sequence and then is welded and fixed with the positive electrode end of the lower battery monomer.

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

the battery support is of an integral injection molding structure.

The battery inserting holes are distributed on the battery bracket in a matrix shape.

The series connection piece is made of PPTC materials.

The parallel network is made of PTC materials.

The parallel network is made of PPTC materials.

The inner surface and the outer surface of the serial sheet are respectively compounded with a metal conducting layer, and the metal conducting layer on the inner surface of the serial sheet is isolated from the metal conducting layer on the outer surface of the serial sheet.

The application has the advantages that:

1. this kind of battery module's series connection piece adopts the PTC material, leads to its high temperature when certain battery monomer of module because of the trouble, and the series connection piece temperature that contacts with it rises thereupon and the resistance sharply increases to cut off this trouble battery monomer and adjacent battery monomer's series connection and parallel connection simultaneously, make this trouble battery monomer from the complete electrical isolation in the battery module, play overheat protection's effect. If the fault removal temperature of the single battery is recovered to be normal, the temperature of the series connection piece is reduced to recover the conductive capability, and the single battery is connected into the battery module newly.

2. The conducting pads of the parallel network are of hollow circular ring structures and are vertically clamped between the circular bottom plates of the serial connection plates and the annular inner flanges, and the circular bottom plates of the circular serial connection plates are welded and fixed with the positive terminals of the battery monomers at the lower side, so that the position of the parallel network is tightly fixed, the parallel network and the serial connection plates are not required to be welded, and the assembly of the module is simplified.

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 an 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 perspective view of a tandem sheet in an embodiment of the present application;

FIG. 4 is a cross-sectional view of a series of plates in an embodiment of the present application;

FIG. 5 is a perspective view of a parallel networking embodiment of the present application;

wherein: 1-battery bracket, 2-battery monomer, 3-series sheet, 4-parallel networking;

101-battery mounting holes, 101 a-upper hole section, 101 b-lower hole section, 102-annular inner flange, 103-channel, 301-circular bottom plate, 301 a-lower protrusion, 302-elastic claw, 401-conductive pad and 402-conductive strip.

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 an embodiment of such a battery module of the present application, which also includes a battery holder 1, battery cells 2, a series sheet 3, and a parallel net 4, as in some conventional battery modules. Wherein:

the battery bracket 1 (or called battery clamp) is integrally formed by injection molding and is made of non-conductive insulating materials. The battery holder 1 is provided with a plurality of vertically penetrating battery insertion holes 101. A ring of annular inner flanges 102 protruding radially inwards are integrally arranged on the wall of the battery insertion hole 101. The annular inner flange 102 divides the battery insertion holes 101 into an upper hole section 101a and a lower hole section 101b located at two axial sides (i.e., upper and lower sides) of the battery insertion holes, and a channel 103 recessed downward from the upper end surface of the battery holder 1 and radially communicating the two upper hole sections 101a is formed between the upper hole sections 101a of any two adjacent battery insertion holes.

The serial connection pieces 3 are provided in plurality, each serial connection piece 3 comprises a circular bottom piece 301 with a lower bulge 301a and a plurality of elastic claws 302 integrally connected to the outer edge of the circular bottom piece 301, and the elastic claws 302 are arranged at intervals around the circular bottom piece 301. The serial piece 3 is embedded in the upper hole section 101a, the circular bottom piece 301 is vertically abutted with the annular inner flange 102, and the lower protrusion 301a downwards penetrates through the central hole of the annular inner flange 102 and extends into the lower hole section 201 b.

The interconnection network 4 is composed of a plurality of conductive pads 401 arranged at intervals and a plurality of conductive strips 402 integrally connected between the conductive pads, the conductive pads 401 and the conductive strips 402 are respectively embedded in the upper hole section 101a and the channel 103, the conductive pads 401 are embedded in the upper hole section 101a, and the conductive strips 402 are embedded in the channel 103. And conductive pad 401 is in conductive contact with circular backsheet 301. In the conventional structure, the conductive pad 401 is further welded to the circular bottom plate 301, but the embodiment does not need to weld the two, which will be described in detail below.

A plurality of battery cells 2 are disposed on both upper and lower sides of the battery holder 1, and for convenience of illustration, only the battery cells on the lower side are shown in fig. 1 and 2, and the battery cells on the upper side are omitted. Wherein, the positive terminal (upper end) of the lower battery cell 2 is inserted into the lower hole section 101b and is welded and fixed with the lower protrusion 301a, so as to realize the conductive connection between the positive terminal of the lower battery cell 2 and the series connection piece 3. The negative end of the upper battery monomer is inserted into the upper hole section 101a and is circumferentially surrounded by the plurality of elastic claws 302 on the serial connection piece 3, and the elastic claws 302 are radially clamped between the battery monomer 2 and the hole wall of the upper hole section 101a, so that the conductive connection between the negative end of the upper battery monomer and the serial connection piece 3 is realized.

By last, upside battery monomer negative pole end and downside battery monomer positive terminal all with the series connection piece 3 conductive connection, so realized the free series connection of upper and lower battery through series connection piece 3, and parallel network 4 and each series connection piece conductive contact to through parallel network 4 realized the parallel connection of each battery monomer negative pole end of upside and the parallel connection of each battery monomer positive terminal of downside.

The key improvement of this embodiment is that the above-mentioned serial sheet 3 is made of PTC material (positive temperature coefficient thermal sensitive material), and the conducting pad 401 of the network 4 is a hollow circular ring structure (non-traditional solid sheet structure) sandwiched between the circular bottom sheet 301 and the annular inner flange 102, and the lower protrusion 301a passes through the central hole of the conducting pad 401 and the central hole of the annular inner flange 102 in sequence downwards and then is welded and fixed with the positive terminal of the lower battery cell 1.

It can be seen that the conducting pad 401 of the parallel net 4 is in a hollow circular structure and is vertically clamped between the circular bottom plate 301 of the serial sheet 3 and the annular inner flange 102, and the circular bottom plate 301 of the circular serial sheet 3 is welded and fixed with the positive end of the lower battery cell 2, so that the position of the parallel net 4 is tightly fixed without welding the parallel net 4 and the serial sheet 3.

In practical application, if a certain single battery 2 has an excessively high temperature due to a fault, the temperature of the series connection piece 3 made of the PTC material in contact with the certain single battery 2 increases, and the resistance value of the high-temperature series connection piece 3 increases sharply, so that the series connection and the parallel connection between the faulty single battery 2 and the adjacent single battery are cut off, the faulty single battery is electrically isolated from the battery module, and an overheat protection effect is achieved. If the fault removal temperature of the single battery 2 is recovered to be normal, the temperature of the series connection piece 3 is reduced to recover the conductive capability, and the single battery 2 is connected to the battery module newly.

The battery insertion holes 101 are distributed on the battery support 1 in a matrix shape, and the battery cells 2 on the upper side and the lower side of the battery support 1 are respectively arranged in a matrix shape under the limit of the battery insertion holes 101.

More preferably, the serial sheet 3 is made of PPTC (Polymeric Positive temperature coefficient) material.

In order to improve the elastic deformation capability of the serial sheet 3, metal conductive layers with certain thicknesses, such as copper, nickel, silver, gold and the like, can be respectively compounded on the inner surface and the outer surface of the serial sheet 3, and the metal conductive layers on the inner surface and the outer surface are ensured to be mutually isolated.

Of course, the parallel network 4 can also be made of PTC, preferably PPTC.

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. A battery module, comprising:

the battery support comprises a battery support (1) made of insulating materials, wherein a plurality of battery inserting holes (101) which are through up and down and are parallel to each other are formed in the battery support (1), a circle of annular inner flange (102) which protrudes inwards in the radial direction is integrally arranged at the hole wall of each battery inserting hole (101), the battery inserting holes (101) are divided into an upper hole section (101a) and a lower hole section (101b) which are located on two axial sides by the annular inner flange (102), and a channel (103) which is sunken downwards from the upper end surface of the battery support (1) and radially communicates the two upper hole sections (101a) is formed between the upper hole sections (101a) of any two adjacent battery inserting holes;

the connecting plates (3) comprise a circular bottom plate (301) with a lower protrusion (301a) and a plurality of elastic claws (302) which are integrally connected to the outer edge of the circular bottom plate (301) and are arranged around the circular bottom plate (301) at intervals, the connecting plates (3) are embedded in the upper hole section (101a), the circular bottom plate (301) is vertically abutted with the annular inner flange (102), and the lower protrusion (301a) downwards penetrates through the central hole of the annular inner flange (102) and extends into the lower hole section (101 b); and

a parallel network (4), wherein the parallel network (4) is composed of a plurality of conducting pads (401) arranged at intervals and a plurality of conducting strips (402) integrally connected between the conducting pads, the conducting pads (401) and the conducting strips (402) are respectively embedded in the upper hole section (101a) and the channel (103), and the conducting pads (401) are in conductive contact with the circular bottom plate (301);

a plurality of battery monomers (2) are uniformly arranged on the upper side and the lower side of the battery support (1), wherein the positive end of the battery monomer (2) on the lower side is inserted into the lower hole section (101b) and is welded and fixed with the lower bulge (301a), the negative end of the battery monomer (2) on the upper side is inserted into the upper hole section (101a) and is circumferentially surrounded by the plurality of elastic claws (302) on the serial piece (3), and the elastic claws (302) are radially clamped between the battery monomer (2) and the hole wall of the upper hole section (101 a);

the battery is characterized in that the serial sheet (3) is made of PTC materials, the conducting pad (401) is of a hollow circular ring structure clamped between the circular bottom sheet (301) and the annular inner flange (102), and the lower protrusion (301a) penetrates through a center hole of the conducting pad (401) and a center hole of the annular inner flange (102) downwards in sequence and then is welded and fixed with the positive end of the lower battery monomer (2).

2. The battery module according to claim 1, wherein the battery holder (1) is of a unitary injection-molded construction.

3. The battery module according to claim 1, wherein the battery receiving openings (101) are distributed in a matrix pattern on the battery holder (1).

4. The battery module according to claim 1, wherein the series connection piece (3) is made of PPTC.

5. The battery module according to claim 1, wherein the parallel network (4) is of PTC material.

6. The battery module according to claim 5, wherein the parallel network (4) is made of PPTC.

7. The battery module according to claim 1, wherein the inner surface and the outer surface of the serial sheet (3) are compounded with a metal conductive layer, and the metal conductive layer on the inner surface of the serial sheet (3) is isolated from the metal conductive layer on the outer surface of the serial sheet (3).