CN215496824U - Novel battery monomer and battery module thereof - Google Patents

Abstract

A novel battery monomer comprises a battery shell, a plurality of layers of positive plates, diaphragms and negative plates which are circularly and alternately stacked, wherein the diaphragms are arranged between the adjacent positive plates and the adjacent negative plates, at least one side edge of a positive current collector extends outwards to exceed the edges of a positive active material layer and the diaphragms, and the edge of the negative current collector and the edge of a negative active material layer on the same side edge are shorter than the edge of the diaphragms but not shorter than the edge of the positive active material layer; the positive current collector extends to be connected with a battery shell body or an end cover adjacent to the positive current collector or extends to be connected with a first heat conductor, and the first heat conductor is connected with the battery shell body or the end cover adjacent to the first heat conductor; the extending part of the positive current collector and the first heat conductor are sealed in the battery shell; the battery shell body or the end cover connected with the positive current collector or the first heat conductor is used as a positive heat radiating surface of the battery, and the first heat conductor is made of heat conducting materials and conducts heat on the positive current collector to the battery shell body or the end cover.

Description

Novel battery monomer and battery module thereof

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a novel battery monomer and a battery module thereof.

Background

In order to alleviate global environmental and resource problems associated with conventional fuel-powered vehicles, the electric vehicle industry is being vigorously developed in various countries throughout the world. The lithium ion power battery is a key component of the electric automobile, and directly influences and restricts the dynamic property, the economical efficiency, the reliability and the safety of the electric automobile. The lithium ion power battery has high requirement on the working temperature, the temperature of 20-50 ℃ is the optimal working temperature, the heat dissipation is required to be rapid in summer, and the battery can be ensured to work stably and efficiently only by requiring rapid heating in winter.

At present, the main materials for forming the lithium ion power battery are manganese compounds, cobalt compounds, ternary compounds and lithium iron phosphate compounds, which are all materials with poor heat conductivity and belong to inorganic salts of poor heat conductors. Due to the defects of the existing battery structure, the heat of the battery with large thickness is difficult to be transmitted and guided from the inside, and the severe problems that the heat can not be quickly and uniformly radiated in summer and can not be quickly and uniformly heated in winter exist, so that the electric vehicle can not be used in high-heat and high-cold areas, a complex and expensive heat radiation and heating system needs to be installed, excessive energy is consumed, the service life of the battery is influenced, even thermal runaway is caused, and the safety of vehicles and personnel is seriously threatened. Therefore, how to quickly and effectively dissipate and heat the lithium ion power battery becomes a technical problem to be solved urgently.

At present, a power battery heat dissipation system commonly adopted by an electric automobile mainly takes away heat from the surface of a power battery monomer in a liquid cooling or air cooling mode. However, the inside of the battery cell is usually a composite structure formed by circularly and alternately overlapping three layers of components, namely the anode, the diaphragm and the cathode, and the diaphragm has poor thermal conductivity, so that when the surface of the battery cell dissipates heat, the surface of the battery dissipates heat faster than the inside of the battery, a large temperature gradient is generated inside the battery cell, the temperature of the battery cell is uneven, the attenuation and reduction rates of all parts of the battery cell are inconsistent, the service life of the battery cell is seriously affected, and the surface contact heat dissipation efficiency is low.

The existing common heat dissipation means are as follows: chinese patent application for application number 201910949761.4 discloses a soft packet of power battery package of electric automobile based on utmost point ear heat dissipation, characterized by: the soft package power battery pack comprises a closable shell, wherein at least two rows of soft package power battery packs are arranged in the shell, and each row of battery pack is provided with a plurality of layers of soft package power battery monomers; two are provided with a plurality of layers of liquid cooling pipeline between the group battery, the liquid cooling pipeline is including setting up the inlet tube in both sides and setting up the outlet pipe in the centre, soft packet of power battery monomer has anodal ear and negative pole ear, anodal ear and negative pole ear are closely laminated through the surface of heat conduction silica gel with the liquid cooling pipeline.

Or, furthermore, each row of battery pack has 2n layers of single batteries, the liquid cooling pipeline has n layers, a liquid cooling pipeline is arranged between every two layers of single batteries, and the anode lug and the cathode lug of each single battery are arranged on the upper/lower surfaces of the corresponding liquid cooling pipeline.

This technique sets up heat conduction silica gel between two battery cells outside the battery promptly, and the surface through heat conduction silica gel and liquid cooling pipeline closely laminates the heat that produces the battery and discharges, and it can strengthen the free radiating effect of battery, has improved the temperature uniformity between the battery monomer simultaneously. However, because the battery pack or the battery pack is a combination of a certain number of battery monomers which are densely packed, the volume of the battery pack or the battery pack is greatly increased due to the dense heat-conducting silica gel and the liquid cooling pipeline, the precious battery pack or the precious battery pack is occupied, and the grouping rate of the battery pack or the battery pack and the energy density of a unit volume of a battery system are obviously reduced.

Therefore, the heat dissipation of the existing battery cell generally dissipates heat from two side surfaces of the battery cell, and the heat in the middle of the battery cannot be timely conducted out, so that the temperature of each part of the battery is uneven.

Secondly, since the activity of lithium ions depends on the ambient temperature, the higher the temperature is, the higher the activity of lithium ions is, and vice versa.

When the temperature is reduced, the activity of lithium ions is reduced, the electrolyte in the battery becomes more solidified, so that the resistance of the lithium ions in the electrolyte is higher, a plurality of lithium ions cannot flow from the negative electrode to the positive electrode, the current output by the battery is reduced, and the endurance mileage of the pure electric vehicle is reduced. Particularly in northern areas of China, cold weather can directly cause serious shrinkage of the endurance of the pure electric vehicle.

For the problem of poor endurance in low-temperature environment, the current mode that the car enterprises use more is through installing PTC heating system additional, namely install PTC heating plate additional in battery package periphery, and the heat transfer of heated air makes the battery rise temperature. Some automobiles are also provided with a diesel oil heating system on the basis of the PTC heating system to heat liquid in pipelines around the battery pack.

However, in the technical means for improving the low-temperature performance by externally heating the battery, because the battery is large in size, slow in heat transfer from outside to inside, and temperature step difference exists between the inside and the outside of the battery, even if the temperature of the outer surface of the battery is very high, the temperature inside the battery is still very low, so that the temperature of the battery is not balanced, and the low-temperature performance cannot be effectively improved.

In summary, the current lithium battery has three technical problems to be solved urgently: the heat dissipation problem of battery package: the heat in the battery can not be led out in time, and the battery pack can not effectively dissipate heat.

The second step is as follows: low-temperature state battery performance is low: the low temperature environment results in poor battery endurance.

And thirdly: the structure is complicated and the energy density per unit volume is low.

Therefore, a novel battery and a battery pack, which can dissipate heat in time, have good low-temperature performance, simple structure and high unit energy density, are needed to meet the actual needs.

SUMMERY OF THE UTILITY MODEL

One of the objectives of the present invention is to provide a battery cell utilizing a current collector of a pole piece to conduct heat, which has the advantages of fast heat conduction and small volume, and can fast and effectively dissipate heat and self-heat and ensure that the battery has high energy density per unit volume.

The second objective of the present invention is to provide a battery module, which comprises a plurality of battery cells and a module housing, and has the advantages of fast heat conduction and small size, and can fast and effectively dissipate heat and self-heat, and ensure that the battery module has high energy density per unit volume.

The technical scheme for realizing the first purpose of the utility model has three types, which are respectively as follows:

the first technical scheme is as follows:

the utility model provides a novel battery monomer, contains battery case, end cover, a plurality of layers positive plate, diaphragm and the negative pole piece that pile up in turn in circulation, positive plate, diaphragm and negative pole piece seal in battery case, positive plate contains the anodal mass flow body and covers the anodal active material layer on its one side or both sides face, the negative pole piece contains the negative pole mass flow body and covers the negative pole active material layer on its one side or both sides face, has diaphragm, its characterized in that between adjacent positive plate and the negative pole piece: at least one side edge of the positive electrode current collector extends outwards to exceed the edges of the positive electrode active material layer and the diaphragm, and the edge of the negative electrode current collector and the edge of the negative electrode active material layer on the same side edge are shorter than the edge of the diaphragm but not shorter than the edge of the positive electrode active material layer; the positive current collector extends to be connected with a battery shell body or an end cover adjacent to the positive current collector or extends to be connected with a first heat conductor, and the first heat conductor is connected with the battery shell body or the end cover adjacent to the first heat conductor; the extension part of the positive current collector and the first heat conductor are sealed in the battery; the battery shell body or the end cover connected with the positive current collector or the first heat conductor is used as a positive heat radiating surface of the battery, the first heat conductor is made of a heat conducting material, and heat on each positive current collector is conducted to the battery shell body or the end cover in the same shortest heat conducting distance.

Second technical scheme

The utility model provides a novel battery monomer, contains battery case, end cover, a plurality of layers positive plate, diaphragm and the negative pole piece that pile up in turn in circulation, positive plate, diaphragm and negative pole piece seal in battery case, positive plate contains the anodal mass flow body and covers the anodal active material layer on its one side or both sides face, the negative pole piece contains the negative pole mass flow body and covers the negative pole active material layer on its one side or both sides face, has diaphragm, its characterized in that between adjacent positive plate and the negative pole piece: at least one side edge of the negative current collector extends outwards to exceed the edges of the negative active material layer and the diaphragm, and the edge of the positive current collector and the edge of the positive active material layer on the same side edge are shorter than the edge of the diaphragm and do not exceed the edge of the negative active material layer; the negative current collector extends to be connected with a battery shell body or an end cover adjacent to the negative current collector or extends to be connected with a second heat conductor, and the second heat conductor is connected with the battery shell body or the end cover adjacent to the second heat conductor; the extension part of the negative current collector and the second heat conductor are sealed in the battery shell; the battery shell body or the end cover connected with the negative current collector or the second heat conductor is used as a negative heat dissipation surface of the battery; the second heat conductor is made of heat conducting materials and conducts heat on each negative current collector to the shell body or the end cover of the battery shell in the same shortest heat conducting distance.

Third technical means

On the basis of the first scheme, at least one side edge of the negative electrode current collector extends outwards and exceeds the edges of the negative electrode active material layer and the diaphragm, and the edge of the positive electrode current collector and the edge of the positive electrode active material layer on the same side edge are shorter than the edge of the diaphragm and do not exceed the edge of the negative electrode active material layer; the side edge of the cathode current collector and the side edge of the cathode current collector which extend outwards are respectively positioned on different side edges; the negative current collector extends to be connected with a battery shell body or an end cover adjacent to the negative current collector or extends to be connected with a second heat conductor, and the second heat conductor is in contact connection with the battery shell body or the end cover adjacent to the second heat conductor; the extension part of the negative current collector and the second heat conductor are sealed in the battery shell; the battery shell body or the end cover connected with the negative current collector or the second heat conductor is used as a negative heat dissipation surface of the battery; the second heat conductor is made of heat conducting materials and conducts heat on each negative current collector to the shell body or the end cover of the battery shell in the same shortest heat conducting distance.

In order to achieve better technical effects, the technical features of the technical scheme of the utility model can be specifically as follows:

1. further, the extending part of the positive current collector is directly or after being bent and is in direct contact connection or locking connection, fitting connection or pressing connection or welding connection or bonding connection or fastening connection with the battery shell or the end cover adjacent to the extending part.

2. Further, the extending part of the positive current collector is directly or after being bent, in direct contact connection or locking connection, attaching connection or pressing connection or welding connection or bonding connection or fastening connection with the first heat conductor.

3. Further, the extending part of the negative current collector is directly or after being bent, directly contacted with the battery shell or the end cover adjacent to the extending part of the negative current collector, or connected with the battery shell or the end cover in a locking mode, or connected in a fitting mode, or connected in a pressing mode, or connected in a welding mode, or connected in an adhesion mode, or connected in a fastening mode.

4. Further, the extending part of the negative current collector is directly or after being bent, in direct contact connection or locking connection, attaching connection or pressing connection or welding connection or bonding connection or fastening connection with the second heat conductor.

5. Further, several or all of the positive current collector extensions are fastened.

6. Further, several or all of the negative current collector extensions are fastened.

7. The first heat conductor and/or the second heat conductor is one of heat-conducting silica gel, a metal sheet or a plurality of metal sheets, a heat exchanger or a radiating fin or a fluid pipeline.

8. The thickness of the battery monomer along the stacking direction of the positive plate, the diaphragm and the negative plate is larger than the length/width of the positive current collector or the negative current collector.

Two technical solutions for achieving the purpose of the second utility model of the present invention are as follows:

a battery module comprises a plurality of battery cells and a module shell, and is characterized in that: the battery monomer be as one of three technical scheme battery monomer as the first utility model purpose, the mutual electricity is connected between the battery monomer, and all battery monomers are closely arranged each other.

A battery module comprises a plurality of battery cells and a module shell, and is characterized in that: the battery monomer be like the first utility model purpose one of three technical scheme battery monomer, a plurality of battery monomer divide into a plurality of rows, and electric connection each other and closely arrange each other between all battery monomers in each row, be closely arranged each other between row and the row.

In order to achieve better technical effect, a heat dissipation device is further arranged inside the module shell and is in contact with the positive and/or negative heat dissipation surface of the battery monomer shell.

Compared with the prior art, the technical scheme of the utility model has the beneficial effects that:

1. according to the utility model, the extending parts are arranged on the side edges of the positive current collector and the negative current collector, so that the current collector of each pole piece becomes a heat conducting part, and the heat on each current collector is conducted to the shell body or the end cover of the battery shell in the same shortest heat conducting distance, so that the heat inside the battery monomer can be directly and quickly conducted out, the heat dissipation effect of the battery monomer is greatly enhanced, the heat generated in the working process of each pole piece in the battery monomer is conducted out through the current collectors, the heat conduction is quick and uniform, and the heat dissipation effect is stable; simultaneously, thereby can carry out self-heating to battery inside through the thermal conduction of mass flow body again, make the inside rapid and even intensification of battery.

2. The temperature consistency among all areas in the single battery is improved, and the temperature difference in the single battery is obviously reduced;

3. the utility model can utilize each current collector in the battery monomer to form a heat conducting piece, and utilize the extension part of each current collector to form a heat conducting channel to be directly connected with the battery shell or be connected with the battery shell through a heat conductor for heat dissipation.

4. By utilizing the battery module consisting of the battery monomers, all the battery monomers can be mutually and tightly arranged; when the battery cells are divided into a plurality of rows, all the battery cells in each row of the battery can be mutually and tightly arranged, so that the unit volume energy density of the battery module and the battery pack is effectively improved, and the battery pack has great superiority.

5. The current collector extension part is adopted for heat conduction, so that the single battery body can conduct heat quickly and uniformly, the heat inside the battery can be conducted quickly, the quick and uniform heat dissipation and self-heating can be realized, the performance of the battery can be effectively improved, and the energy density of the single battery body per unit volume can be further improved.

6. The thickness of the battery monomer along the stacking direction of the positive plate, the diaphragm and the negative plate can be larger than the length/width of the positive current collector or the negative current collector, so that the capacity of the battery monomer is improved.

7. By adopting the battery of the technical scheme of the utility model, in the battery module consisting of the battery monomers, all the battery monomers can be densely packed to effectively improve the energy density of the battery per unit volume, and the volume of the battery pack can be obviously reduced under the condition of the same capacity requirement. The overall performance of the automobile is improved.

8. The utility model utilizes the inherent positive and negative current collectors in the single battery to dissipate heat, realizes a simple structural design while realizing a heat dissipation function, and reduces the number of parts, thereby improving the reliability of a heat dissipation management system and reducing the batch production cost.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrating the utility model by way of example and not limiting the scope of the utility model.

FIG. 1 is a schematic structural diagram of a first embodiment of a novel battery cell of the present invention

FIG. 2 is a front view of the novel battery cell shown in FIG. 1

FIG. 3 is a schematic cross-sectional view of the novel battery cell shown in FIG. 2 taken along line B-B

Wherein 100 is a battery monomer, 1 is a positive plate, 11 is a positive current collector, 111 is the edge of the positive current collector, 12 is a positive active material layer, and 121 is the edge of the positive active material layer; 2 is a negative plate, 21 is a negative current collector, 211 is a negative current collector edge, 22 is a negative active material layer, and 221 is a negative active material layer edge; 3 is a diaphragm, 31 is a diaphragm edge, 6 is a battery shell, 61 is a shell, 611 is a shell bottom, 62 is an end cover, 101 is a positive heat dissipation surface of the battery cell shell, and 102 is a negative heat dissipation surface of the battery cell shell.

FIG. 4 is a schematic structural diagram of a second embodiment of the novel battery cell of the present invention

FIG. 5 is a front view of the novel battery cell shown in FIG. 4

FIG. 6 is a schematic cross-sectional view of the novel battery cell shown in FIG. 2 taken along line B-B

Fig. 7 is a schematic structural diagram of an embodiment of a battery module formed by applying the single battery according to the first technical solution of the present invention, where 100 is the single battery, 1 is a positive plate, 11 is a positive current collector, 111 is a positive current collector edge, 12 is a positive active material layer, and 121 is a positive active material layer edge; 2 is a negative plate, 21 is a negative current collector, 211 is a negative current collector edge, 22 is a negative active material layer, and 221 is a negative active material layer edge; 3 is the diaphragm, 31 is the diaphragm edge, 4 is the first heat conductor, 5 is the second heat conductor, 6 is the battery shell, 61 is the shell casing, 62 is the end cover, 611 is the shell casing bottom. 101 is the positive heat dissipation surface of the battery cell shell, and 102 is the negative heat dissipation surface of the battery cell shell.

The specific implementation mode is as follows:

for better understanding of the technical solution of the present invention, an embodiment of the technical solution of the present invention will be described in detail below with reference to fig. 1 to 6.

The first embodiment is as follows:

as shown in fig. 1 to 3, a novel battery cell 100 includes a battery case 6, a plurality of layers of positive electrode sheets 1, a separator 3 and negative electrode sheets 2 stacked alternately in a circulating manner, the battery case 6 includes a casing 61 and an end cap 62, the positive electrode sheets 1, the separator 32 and the negative electrode sheets 2 are enclosed in the battery case 6, and the positive electrode sheet 1 includes a positive electrode current collector 11 and a positive electrode active material layer 12 covering one or two side surfaces thereof; the negative electrode sheet 2 includes a negative electrode current collector 21 and a negative electrode active material layer 22 covering one or both sides thereof, with a separator 3 between adjacent positive and negative electrode sheets 1 and 2. In the present embodiment, one side of the positive electrode current collector 11 extends outward beyond the edge 121 of the positive electrode active material layer 12 and the edge 31 of the separator 3, and the edge 211 of the negative electrode current collector 21 and the edge 221 of the negative electrode active material layer on the same side are shorter than the edge 31 of the separator 3 but not shorter than the edge 121 of the positive electrode active material layer; the positive current collector 11 extends to and is connected with the adjacent end cover 62, and the end cover 62 connected with the positive current collector 11 is used as a positive heat dissipation surface 101 of the battery;

meanwhile, in this embodiment, one side of the negative electrode current collector 21 extends outward beyond the edges of the negative electrode active material layer 22 and the separator 3, and the edge 111 of the positive electrode current collector and the edge 121 of the positive electrode active material layer on the same side are shorter than the edge 31 of the separator and do not extend beyond the edge 221 of the negative electrode active material layer 22; the negative electrode current collector 21 extends to and is connected with the inner side of the shell bottom 611 adjacent to the negative electrode current collector, and the shell bottom 611 connected with the negative electrode current collector is used as the negative electrode heat dissipation surface 102 of the battery and then dissipates heat outwards through the shell.

In this embodiment, the extending portions of the positive electrode current collector 11 and the negative electrode current collector 21 are directly connected to the housing, so as to conduct the heat on each negative electrode current collector 21 to the battery housing case 61 or the end cap 62 with the same shortest heat conduction distance.

The extension of the positive current collector and the extension of the negative current collector are enclosed in a battery case 6.

In practical application, in order to achieve a better technical effect, the side edge of the outwardly extending positive current collector and the side edge of the outwardly extending negative current collector are respectively positioned at different side edges; the positive and/or negative current collectors may also extend outward from two or more sides simultaneously.

Preferably, in this embodiment, the outwardly extending side edge of the positive electrode current collector and the outwardly extending side edge of the negative electrode current collector are opposite side edges to each other.

In this embodiment, the extending portions of the positive electrode current collector 11 and the negative electrode current collector 21 are directly connected to the end cap 62 and the bottom 611 of the casing 61 adjacent to the extending portions, respectively, in practical application, the extending portions may also be connected by a locking connection, an attaching connection, a pressing connection, a welding connection, an adhering connection, or a fastening connection.

In practical application, the extending part of the positive electrode current collector or the negative electrode current collector can be directly connected with the adjacent battery shell or end cover in a contact manner or in a locking manner, in a fitting manner or in a pressing manner or in a welding manner or in an adhesion manner or in a fastening manner after being bent.

In practical application, several or all of the positive current collector extension parts can be connected with the battery shell or the end cover after being fastened and connected.

In practical application, several or all of the negative current collector extensions may be fastened and then connected to the battery case body or the end cap.

Or a plurality of or all the extending parts of the positive current collector and the negative current collector can be respectively fastened and connected and then respectively connected with the adjacent battery shell body or the end cover.

In practical application, the current collector is adopted to extend heat conduction, so that the rapid and uniform heat conduction of the battery monomer is realized, and the thickness of the battery monomer along the stacking direction of the positive plate, the diaphragm and the negative plate can be larger than the length/width of the positive current collector or the negative current collector. In a battery module composed of battery cells, all the battery cells may be densely packed to increase the volumetric energy density of the battery.

Example two:

as shown in fig. 4-6, unlike the first embodiment, in this embodiment, the positive electrode current collector extends to connect with the first heat conductor 4, the negative electrode current collector extends to connect with the second heat conductor 5, the first heat conductor 4 is connected with the battery end cap 62 adjacent thereto, and the second heat conductor 5 is connected with the inner side of the battery case bottom 611 adjacent thereto; the extension part of the positive current collector, the extension part of the negative current collector, the first heat conductor 4 and the second heat conductor 5 are enclosed in a battery shell 6.

In this embodiment, the extending portions of the positive current collector 11 and the negative current collector 21 are respectively connected to the first heat conductor 4 and the second heat conductor 5, and the first heat conductor 4 and the second heat conductor 5 are connected to the outer shell of the battery, so as to conduct the heat on each negative current collector 21 to the battery case 61 or the end cap 62 with the same shortest heat conduction distance.

The first heat conductor and/or the second heat conductor is one of heat-conducting silica gel, a metal sheet or a plurality of metal sheets, a heat exchanger or a radiating fin or a fluid pipeline.

In practical application, in order to achieve a better technical effect, the side edge of the outwardly extending positive current collector and the side edge of the outwardly extending negative current collector are respectively positioned at different side edges;

preferably, in this embodiment, the outwardly extending positive electrode current collector and the outwardly extending negative electrode current collector are opposite side edges of each other.

In this embodiment, the positive current collector and the negative current collector extend to and directly connect with the first heat conductor and the second heat conductor in a direct contact manner, and in practical application, the positive current collector and the negative current collector can be connected in a locking connection mode, a fitting connection mode, a pressing connection mode, a welding connection mode, an adhesion connection mode or a fastening connection mode.

In practical application, the extending portion of the positive electrode current collector or the negative electrode current collector can be respectively connected with the first heat conductor and the second heat conductor in a direct contact mode or in a locking mode, in a fitting mode or in a pressing mode or in a welding mode or in an adhesion mode or in a fastening mode after being bent.

In practical application, several or all of the extending portions of the positive current collector may be connected to the first heat conductor after being fastened.

In practical application, several or all of the extending portions of the negative current collector may be connected to the second heat conductor after being fastened.

Or simultaneously, a plurality of or all the extending parts of the anode current collector and the cathode current collector are respectively fastened and connected and then are respectively connected with the first heat conductor and the second heat conductor.

The first heat conductor and the second heat conductor are in contact connection or locking connection, fit connection or pressing connection or welding connection or bonding connection or fastening connection with the battery shell or the end cover.

In practical application, the current collector extension and the heat conduction of the first heat conductor and the second heat conductor are adopted, so that the single battery body can conduct heat quickly and uniformly; the thickness of the battery cell along the stacking direction of the positive plate, the diaphragm and the negative plate can be larger than the length/width of the positive current collector or the negative current collector. In a battery module composed of battery cells, all the battery cells may be densely packed to increase the volumetric energy density of the battery.

Example three:

fig. 7 shows an embodiment of a battery module formed by applying the battery cells according to the first embodiment of the present invention, which is described in detail below with reference to fig. 7.

In fig. 7, 200 is a battery module, 201 is a battery row, 202 is a battery module housing case, and 203 is a battery module end cap. 100 is a battery cell, and 101 is a positive heat dissipation surface of a battery cell shell.

As shown in fig. 7, the battery module according to the present invention includes a plurality of battery cells 100 and a module housing 202, wherein the battery cells 100 are the battery cells according to one of the three technical solutions of the first utility model, the battery cells are electrically connected to each other, and all the battery cells 100 are closely arranged. In this embodiment, only eight battery cells are shown, and each battery module may include a greater number of battery cells in practical applications.

In this embodiment, the heat dissipation surface 101 of the battery cell housing faces the end cap 203 of the module housing, and the heat dissipation surface of the battery cell housing faces the inner side of the bottom of the module housing case 202.

Furthermore, in this embodiment, in order to better describe the arrangement of the battery modules, in this embodiment, the eight battery cells are divided into two battery rows 201, the four battery cells 100 in each row are electrically connected to each other and tightly arranged with each other, and the two battery rows 201 are also tightly arranged with each other.

In order to achieve better technical effect, a heat dissipation device can be further arranged in the module shell and is in contact with the positive and/or negative heat dissipation surface of the battery monomer shell.

By adopting the battery monomer and the battery module thereof in the technical scheme of the utility model, the rapid heat conduction and heat dissipation of the interior of the battery can be realized, the heat conduction performance of the battery and the module is good, the energy density of the battery monomer per unit volume is effectively improved, and the volumes of the battery monomer, the battery module and the battery pack are obviously reduced under the condition of the same capacity requirement.

The foregoing is a preferred embodiment of the present invention and structures and elements not specifically described herein are understood to be implemented using conventional equipment and methods known in the art.

The above embodiments and the drawings are only for assisting understanding of the technical solutions of the present invention, and are not intended to limit the technical solutions and the protection scope of the present invention. Modifications of the technical solutions disclosed in the claims and the specification by equivalent technical means, equivalent devices and the like should be considered as not exceeding the scope of the claims and the specification of the utility model.

The battery monomer and the battery module provided by the technical scheme of the utility model can be widely applied to the field needing batteries, in particular to the field needing high-capacity batteries.

Claims (22)

1. The utility model provides a novel battery monomer, contains battery case, a plurality of layers positive plate, diaphragm and the negative pole piece that pile up in turn in circulation, positive plate, diaphragm and negative pole piece seal in battery case, positive plate contains the anodal mass flow body and covers the anodal active material layer on its one side or both sides face, the negative pole piece contains the negative pole mass flow body and covers the negative pole active material layer on its one side or both sides face, has diaphragm, its characterized in that between adjacent positive plate and the negative pole piece: at least one side of the positive electrode current collector (11) extends outwards to exceed the edge (31) of the positive electrode active material layer (12) and the diaphragm, and the edge (211) of the negative electrode current collector (21) and the edge (221) of the negative electrode active material layer on the same side are shorter than the edge (31) of the diaphragm but not shorter than the edge (121) of the positive electrode active material layer (12); the positive current collector (11) extends to be connected with a battery shell body (61) or an end cover (62) adjacent to the positive current collector or extends to be connected with a first heat conductor (4), and the first heat conductor (4) is connected with the battery shell body (61) or the end cover (62) adjacent to the first heat conductor; the extension part of the positive current collector (11) and the first heat conductor (4) are sealed in the battery shell (6); the battery shell body (61) or the end cover (62) connected with the positive current collector (11) or the first heat conductor (4) is used as a positive heat radiating surface (101) of the battery, the first heat conductor (4) is made of heat conducting materials, and heat on each positive current collector (11) is conducted to the battery shell body or the end cover in the same shortest heat conducting distance.

2. The novel battery cell of claim 1, wherein: at least one side edge of the negative electrode current collector (21) extends outwards and exceeds the edges of the negative electrode active material layer (22) and the diaphragm (3), and the edge (111) of the positive electrode current collector (11) and the edge (121) of the positive electrode active material layer (12) on the same side edge are shorter than the edge (301) of the diaphragm (3) and do not exceed the edge (221) of the negative electrode active material layer (22); the positive current collector (11) and the negative current collector (21) which extend outwards are respectively positioned on different side edges; the negative electrode current collector (21) extends to be connected with a battery shell body (61) or an end cover (62) adjacent to the negative electrode current collector, or extends to be connected with a second heat conductor (5), and the second heat conductor (5) is in contact connection with the battery shell body (61) or the end cover (62) adjacent to the second heat conductor; the extension part of the negative current collector (21) and the second heat conductor (5) are sealed in the battery shell (6); a battery shell body (61) or an end cover (62) connected with the negative current collector (21) or the second heat conductor (5) is used as a negative heat dissipation surface (102) of the battery; the second heat conductor (5) is made of heat conducting materials and conducts heat on each negative current collector (21) to the battery shell body (61) or the end cover (62) in the same shortest heat conducting distance.

3. The novel battery cell of claim 1 or 2, characterized in that: the extending part of the positive electrode current collector (11) is directly or after being bent and is in direct contact connection or locking connection, fitting connection or pressing connection or welding connection or bonding connection or fastening connection with a battery shell body (61) or an end cover (62) adjacent to the extending part.

4. The novel battery cell of claim 1 or 2, characterized in that: the extending part of the positive current collector (11) is directly or after being bent, in direct contact connection or locking connection, attaching connection or pressing connection or welding connection or bonding connection or fastening connection with the first heat conductor (4).

5. The novel battery cell of claim 2, wherein: the extending part of the negative electrode current collector is directly or after being bent, directly contacted with a battery shell body (61) or an end cover (62) adjacent to the extending part or is connected with the battery shell body or the end cover in a locking mode, in an attaching mode, in a pressing mode, in a welding mode, in an adhering mode or in a fastening mode.

6. The novel battery cell of claim 2, wherein: the extending part of the negative current collector (21) is directly or after being bent, in direct contact connection or locking connection, attaching connection or pressing connection or welding connection or bonding connection or fastening connection with the second heat conductor (5).

7. The novel battery cell of claim 1 or 2, characterized in that: several or all the extending parts of the positive current collector (11) are fixedly connected.

8. The novel battery cell of claim 2, wherein: several or all of the extensions of the negative current collector (21) are fastened.

9. The novel battery cell of claim 1, wherein: the first heat conductor (4) is one of heat-conducting silica gel, a metal sheet or a plurality of metal sheets, a heat exchanger, a radiating fin or a fluid pipeline.

10. The novel battery cell of claim 2, wherein: the first heat conductor (4) and/or the second heat conductor (5) is one of heat-conducting silica gel, a metal sheet or a plurality of metal sheets, a heat exchanger, a radiating fin or a fluid pipeline.

11. The novel battery cell of claim 1, wherein: the thickness of the battery monomer along the stacking direction of the positive plate (1), the diaphragm (3) and the negative plate (2) is larger than the length/width of the positive current collector or the negative current collector.

12. The utility model provides a novel battery monomer, contains battery case, a plurality of layers positive plate, diaphragm and the negative pole piece that pile up in turn in circulation, positive plate, diaphragm and negative pole piece seal in battery case, positive plate contains the anodal mass flow body and covers the anodal active material layer on its one side or both sides face, the negative pole piece contains the negative pole mass flow body and covers the negative pole active material layer on its one side or both sides face, has diaphragm, its characterized in that between adjacent positive plate and the negative pole piece: at least one side edge of the negative electrode current collector (21) extends outwards to exceed the edge (301) of the negative electrode active material layer (22) and the edge (121) of the diaphragm (3), and the edge (111) of the positive electrode current collector (11) and the edge (121) of the positive electrode active material layer on the same side edge are shorter than the edge (301) of the diaphragm and do not exceed the edge (221) of the negative electrode active material layer; the negative electrode current collector (21) extends to be connected with a battery shell body (61) or an end cover (62) adjacent to the negative electrode current collector, or extends to be connected with a second heat conductor (5), and the second heat conductor (5) is connected with the battery shell body (61) or the end cover (62) adjacent to the second heat conductor; the extension part of the negative current collector (21) and the second heat conductor (5) are sealed in the battery shell (6); a battery shell body (61) or an end cover (62) connected with the negative current collector (21) or the second heat conductor (5) is used as a negative heat dissipation surface (102) of the battery; the second heat conductor (5) is made of heat conducting materials, and heat on each negative current collector (21) is conducted to the battery shell body (61) or the end cover (62) in the same shortest heat conducting distance.

13. The novel battery cell of claim 12, wherein: the extending part of the positive electrode current collector (11) is directly or after being bent and is in direct contact connection or locking connection, fitting connection or pressing connection or welding connection or bonding connection or fastening connection with a battery shell body (61) or an end cover (62) adjacent to the extending part.

14. The novel battery cell of claim 12, wherein: the extending part of the negative electrode current collector is directly or after being bent, directly contacted with a battery shell body (61) or an end cover (62) adjacent to the extending part or is connected with the battery shell body or the end cover in a locking mode, in an attaching mode, in a pressing mode, in a welding mode, in an adhering mode or in a fastening mode.

15. The novel battery cell of claim 12, wherein: the extending part of the negative current collector (21) is directly or after being bent, in direct contact connection or locking connection, attaching connection or pressing connection or welding connection or bonding connection or fastening connection with the second heat conductor (5).

16. The novel battery cell of claim 12, wherein: several or all the extending parts of the positive current collector (11) are fixedly connected.

17. The novel battery cell of claim 12, wherein: several or all of the extensions of the negative current collector (21) are fastened.

18. The novel battery cell of claim 12, wherein: the second heat conductor (5) is one of heat-conducting silica gel, a metal sheet or a plurality of metal sheets or a heat exchanger or a radiating fin or a fluid pipeline.

19. The novel battery cell of any one of claims 12-18, wherein: the thickness of the battery monomer along the stacking direction of the positive plate (1), the diaphragm (3) and the negative plate (2) is larger than the length/width of the positive current collector or the negative current collector.

20. A battery module comprises a plurality of battery cells and a module shell, and is characterized in that: the battery cells are the battery cells as claimed in any one of claims 1 to 19, the battery cells are electrically connected with each other, and all the battery cells are closely arranged with each other.

21. A battery module comprises a plurality of battery cells and a module shell, and is characterized in that: the battery cell is the battery cell as claimed in one of claims 1 to 19, the plurality of battery cells (100) are divided into a plurality of rows, all the battery cells in each row are electrically connected with each other and are closely arranged with each other, and the rows are closely arranged with each other.

22. The battery module of claim 21, wherein: the module shell is internally provided with a heat dissipation device which is contacted with the positive and/or negative heat dissipation surface of the battery monomer shell.

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