CN219180615U - Battery cell - Google Patents

Abstract

The utility model discloses a battery, which comprises: a housing; the positive plate comprises a positive dressing part and a positive heat conduction part, wherein the positive heat conduction part is arranged at one side of the positive dressing part, and the number of the positive plates is multiple; the negative electrode plate comprises a negative electrode dressing part and a negative electrode heat conduction part, wherein the negative electrode heat conduction part is arranged on one side of the negative electrode dressing part, the number of the negative electrode plates is multiple, and a plurality of positive electrode plates and a plurality of negative electrode plates are alternately laminated. From this, through setting up anodal dressing portion and anodal heat conduction portion on the positive plate, set up negative pole dressing portion and negative pole heat conduction portion on the negative plate, anodal heat conduction portion can be with the heat transfer of anodal dressing portion to the casing, negative pole heat conduction portion can be with the heat transfer of negative pole dressing portion to the casing to through the casing transfer to external, can make the heat homoenergetic on each positive plate and each negative plate in time be derived like this, thereby can prevent that the inside local overheat of battery, can make the heat dissipation inside the battery more even.

Description

Battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery.

Background

The lithium ion batteries in the market at present are mainly divided into two process routes of winding and lamination, wherein the lamination process is to laminate a positive plate and a negative plate together one by one, and the middle is insulated and isolated by a diaphragm. In practical application scenes, heat is generated in the charging and discharging processes of the battery, and the higher the current is in the charging and discharging process, the higher the heat is, and the higher the temperature of the battery is.

In the prior art, a heat dissipation mode is adopted by immersing the periphery of the battery pole core into thermosetting glue liquid to dissipate heat, so that the heat dissipation mode is low in efficiency, the inside of the battery pole core cannot be timely dissipated, the working temperature of the battery is uneven, the battery works for a long time under the condition, the service life of the battery can be rapidly reduced, lithium precipitation of the battery can occur when the battery is severe, and therefore the internal short circuit and failure of the battery are caused, and the danger is increased.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a battery which can improve heat dissipation uniformity.

A battery according to an embodiment of the present utility model includes: a housing; the positive plate is arranged in the shell and comprises a positive dressing part and a positive heat conduction part, wherein the positive heat conduction part is arranged at one side of the positive dressing part, and the positive plate is a plurality of positive plates; negative pole piece, the negative pole piece set up in the casing and including negative pole dressing portion and negative pole heat conduction portion, negative pole heat conduction portion set up in one side of negative pole dressing portion, the negative pole piece be a plurality of, a plurality of positive pole piece and a plurality of negative pole piece stack up in turn and set up, a plurality of positive pole dressing portion and a plurality of negative pole dressing portion each other coincide and form the dressing district jointly, positive pole heat conduction portion with negative pole heat conduction portion is located respectively the both sides of dressing district.

From this, through setting up anodal dressing portion and anodal heat conduction portion on the positive plate, set up negative pole dressing portion and negative pole heat conduction portion on the negative plate, anodal heat conduction portion can be with the heat transfer of anodal dressing portion to the casing, negative pole heat conduction portion can be with the heat transfer of negative pole dressing portion to the casing to through the casing transfer to external, can make the heat homoenergetic on each positive plate and each negative plate in time be derived like this, thereby can prevent that the inside local overheat of battery, can make the heat dissipation inside the battery more even.

According to some embodiments of the utility model, the areas of the positive electrode dressing portion and the negative electrode dressing portion are equal and are both a, the areas of the positive electrode heat conduction portion and the negative electrode heat conduction portion are equal and are both b, and a and b satisfy the relation: a/b > 2.

According to some embodiments of the utility model, the positive electrode heat conducting portion and the negative electrode heat conducting portion are both current collectors, the current collectors being coated with a heat conducting layer; and/or the surface of the current collector is not coated with a heat conducting layer.

According to some embodiments of the utility model, the thermally conductive layer has a thickness d1, d1 satisfying the relationship: d1 is less than or equal to 1 mu m and less than or equal to 5 mu m.

According to some embodiments of the utility model, the thermally conductive layer comprises at least one of graphite, carbon nanotubes, graphene, and conductive carbon black.

According to some embodiments of the utility model, a plurality of heat-conducting and insulating modules are arranged in the shell, the plurality of heat-conducting and insulating modules are arranged on two sides of the dressing area, the plurality of heat-conducting and insulating modules are arranged in a stacked mode in the stacking direction of the positive plate and the negative plate and are in contact with the shell, the positive heat-conducting part is inserted between two heat-conducting and insulating modules adjacent to one side of the dressing area and is in contact with the heat-conducting and insulating modules, and the negative heat-conducting part is inserted between two heat-conducting and insulating modules adjacent to the other side of the dressing area and is in contact with the heat-conducting and insulating modules.

According to some embodiments of the utility model, one of the positive electrode heat conducting part or one of the negative electrode heat conducting part is inserted into two adjacent heat conducting and insulating modules; and/or inserting a plurality of positive electrode heat conducting parts or a plurality of negative electrode heat conducting parts into two adjacent heat conducting and insulating modules.

According to some embodiments of the utility model, the heat-conducting and insulating modules are elastic heat-conducting and insulating modules, the thickness of the heat-conducting and insulating modules at two sides of the dressing area is equal to the thickness of the interior of the shell, and two ends of the heat-conducting and insulating modules in the stacking direction are in elastic close contact with the inner wall of the shell.

According to some embodiments of the utility model, the area of the heat conducting and insulating module is larger than the area of the positive electrode heat conducting part and the area of the negative electrode heat conducting part, and the side surface of the heat conducting and insulating module is in elastic close contact with the inner wall of the shell.

According to some embodiments of the utility model, the thermally conductive insulating module comprises at least one of thermally conductive silicone gel, thermally conductive silicone sheet, thermally conductive rubber, and thermally conductive latex.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a positive electrode sheet according to an embodiment of the present utility model;

fig. 2 is a schematic view of a negative electrode sheet according to an embodiment of the present utility model;

FIG. 3 is a partial schematic view of a battery according to an embodiment of the present utility model;

fig. 4 is a schematic view of a thermally conductive and insulating module according to an embodiment of the utility model.

Reference numerals:

100. a battery;

10. a heat conducting insulating module;

20. a positive plate; 21. A positive electrode dressing portion; 22. A positive electrode heat conduction part;

30. a negative electrode sheet; 31. A negative electrode dressing portion; 32. A negative electrode heat conduction portion;

40. a dressing region.

Detailed Description

Embodiments of the present utility model will be described in detail below, by way of example with reference to the accompanying drawings.

A battery 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 4.

As shown in connection with fig. 1 to 4, a battery 100 according to the present utility model may mainly include: the battery 100 comprises a shell, the positive plate 20 and the negative plate 30, wherein the shell can hold the positive plate 20 and the negative plate 30 of the battery 100 and can hold electrolyte, the shell can protect functional elements in the battery 100, the battery 100 can have a stable and reliable structure, the positive plate 20 is made of a material with relatively active chemical properties, a reduction reaction occurs in the discharging process of the battery 100, the negative plate 30 is made of a material with relatively inactive chemical properties, an oxidation reaction occurs in the discharging process of the battery 100, ions and electrons are decomposed from the negative plate 30 in the discharging process of the battery 100, the electrons can reach the positive plate 20 along an external circuit, the ions can flow in the electrolyte to reach the positive plate 20, the ions can flow in the charging process of the battery 100 to reach the negative plate 30 along the external circuit, and the arrangement of the positive plate 20 and the negative plate 30 can ensure the normal operation of the charging function and the discharging function of the battery 100.

Further, the positive electrode sheet 20 is disposed in the case, and includes a positive electrode dressing portion 21 and a positive electrode heat conducting portion 22, the positive electrode heat conducting portion 22 being disposed on one side of the positive electrode dressing portion 21, the positive electrode sheet 20 being plural. Specifically, positive plate 20 sets up in the casing to including positive dressing portion 21 and positive heat conduction portion 22, the coating has positive dressing on the positive dressing portion 21, can provide energy for battery 100, positive heat conduction portion 22 sets up in one side of positive dressing portion 21, positive dressing portion 21 can produce heat in battery 100 course of working, rise the temperature of positive plate 20, so set up, positive heat conduction portion 22 can be connected with positive dressing portion 21 direct, in battery 100 course of working, can derive the heat that positive dressing portion 21 produced fast, can prevent that the heat in the positive plate 20 from piling up, positive plate 20 is a plurality of, set up a plurality of positive plates 20 and can improve battery 100's energy, can promote battery 100's working capacity.

Further, the negative electrode sheet 30 is disposed in the case, and includes a negative electrode dressing portion 31 and a negative electrode heat conduction portion 32, the negative electrode heat conduction portion 32 being disposed on one side of the negative electrode dressing portion 31, the negative electrode sheet 30 being plural. Specifically, negative electrode sheet 30 sets up in the casing to including negative electrode dressing portion 31 and negative electrode heat conduction portion 32, the coating has the negative electrode dressing on the negative electrode dressing portion 31, can provide energy for battery 100, negative electrode heat conduction portion 32 sets up in one side of negative electrode dressing portion 31, negative electrode dressing portion 31 can produce heat in battery 100 course of working, the temperature of rising negative electrode sheet 30 sets up so, negative electrode heat conduction portion 32 can with negative electrode dressing portion 31 lug connection, in battery 100 course of working, can derive the heat that negative electrode dressing portion 31 produced fast, can prevent that the heat in the negative electrode sheet 30 from piling up, negative electrode sheet 30 is a plurality of, set up a plurality of negative electrode sheets 30 and can improve battery 100's energy, can promote battery 100's working capacity.

Further, the plurality of positive electrode sheets 20 and the plurality of negative electrode sheets 30 are alternately stacked, the plurality of positive electrode dressing portions 21 and the plurality of negative electrode dressing portions 31 overlap each other, and together form a dressing region 40, and the positive electrode heat conduction portion 22 and the negative electrode heat conduction portion 32 are respectively located on both sides of the dressing region 40. Specifically, the plurality of positive plates 20 and the plurality of negative plates 30 are alternately stacked, so that the number of the internal plates of the battery 100 can be increased, the capacity of the battery 100 can be increased, the internal structure of the battery 100 can be simplified, the internal compactness of the battery 100 can be improved, the movement of ions between the positive plates 20 and the negative plates 30 can be accelerated, the working efficiency of the battery 100 can be improved, the plurality of positive dressing parts 21 and the plurality of negative dressing parts 31 are mutually overlapped, the dressing areas 40 are jointly formed, the positive heat conducting parts 22 and the negative heat conducting parts 32 are respectively positioned at two sides of the dressing areas 40, in the working process of the battery 100, the positive heat conducting parts 22 in the plurality of positive plates 20 and the negative heat conducting parts 32 in the plurality of negative plates 30 can simultaneously conduct out the heat of each positive plate 20 and each negative plate 30 in time, so that the internal local temperature of the dressing areas 40 is prevented from overheating, the internal heat dissipation of the battery 100 can be more uniform, the temperatures of the dressing areas 40 can be kept consistent, the heat dissipation of the battery 20 and the negative plates 30 can be prevented from being generated, the heat dissipation performance of the battery 100 can be improved, and the working environment of the battery 100 can be improved, and the heat dissipation performance of the battery 100 can be improved.

Therefore, by arranging the positive electrode dressing portion 21 and the positive electrode heat conducting portion 22 on the positive electrode sheet 20 and arranging the negative electrode dressing portion 31 and the negative electrode heat conducting portion 32 on the negative electrode sheet 30, the positive electrode heat conducting portion 22 can transfer heat of the positive electrode dressing portion 21 to the casing, the negative electrode heat conducting portion 32 can transfer heat of the negative electrode dressing portion 31 to the casing, and the heat is transferred to the outside through the casing, so that heat on each positive electrode sheet 20 and each negative electrode sheet 30 can be timely conducted out, local overheating inside the battery 100 can be prevented, and heat dissipation inside the battery 100 can be more uniform.

As shown in fig. 1 to 3, the areas of the positive electrode dressing portion 21 and the negative electrode dressing portion 31 are equal and are a, the areas of the positive electrode heat conduction portion 22 and the negative electrode heat conduction portion 32 are equal and are b, and a and b satisfy the relation: a/b > 2. Specifically, the areas of the positive electrode dressing portion 21 and the negative electrode dressing portion 31 are equal, the areas of the positive electrode heat conduction portion 22 and the negative electrode heat conduction portion 32 are equal, the areas of the positive electrode dressing portion 21 and the negative electrode dressing portion 31 are equal, the production of the positive electrode sheet 20 and the coating of the positive electrode dressing portion 21 on the positive electrode sheet 20 can be facilitated, the production of the negative electrode sheet 30 and the coating of the negative electrode dressing portion 31 on the negative electrode sheet 30 can be facilitated, the areas of the positive electrode heat conduction portion 22 and the negative electrode heat conduction portion 32 are equal, the production of the positive electrode heat conduction portion 22 and the negative electrode heat conduction portion 32 can be facilitated, the production efficiency of the positive electrode sheet 20 and the negative electrode sheet 30 can be improved through such arrangement, and the production efficiency of the battery 100 can be further improved.

Further, the areas of the positive electrode dressing portion 21 and the negative electrode dressing portion 31 are equal and are both a, the areas of the positive electrode heat conduction portion 22 and the negative electrode heat conduction portion 32 are equal and are both b, and a and b satisfy the relation: in the structure of the battery 100, a/b > 2, the larger the areas of the positive electrode heat conduction part 22 and the negative electrode heat conduction part 32 are, the larger the areas of the positive electrode sheet 20 and the negative electrode sheet 30 are, the smaller the volume energy density of the positive electrode sheet 20 and the negative electrode sheet 30 is, the area of the positive electrode dressing part 21 is set to be more than twice that of the positive electrode heat conduction part 22, and the area of the negative electrode dressing part 31 is set to be more than twice that of the negative electrode heat conduction part 32.

According to some embodiments of the present utility model, both the positive and negative thermally conductive portions 22, 32 are current collectors, the surface of which is coated with a thermally conductive layer. Specifically, the current collector can directly collect the current generated by the active material of the battery 100 in the working process to form larger current to be output outwards, the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32 are both current collectors, on one hand, the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32 can conveniently conduct out the heat generated in the dressing area 40, on the other hand, the current can conveniently flow in the battery 100 quickly, stable current can be generated in the battery 100, the working performance of the battery 100 can be ensured to be stable, the arrangement is such that the heat dissipation performance of the battery 100 can be improved, the working stability of the battery 100 can be ensured, the functionality of parts of the battery 100 can be increased, the structure of the battery 100 can be further simplified, the internal structural compactness of the battery 100 can be improved, the heat conducting layer is coated on the surface of the current collector, the heat conducting rate of the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32 can be further accelerated, and the heat dissipation performance of the battery 100 can be further improved. In the embodiment of the present utility model, the positive electrode heat conducting portion 22 is preferably made of aluminum, and the negative electrode heat conducting portion 32 is preferably made of copper.

According to other embodiments of the present utility model, both the positive and negative electrode heat conducting portions 22, 32 are current collectors, the surfaces of which are not coated with a heat conducting layer. Specifically, the current collector can directly collect the current generated by the active material of the battery 100 in the working process to form larger current to be output outwards, the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32 are both current collectors, on one hand, the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32 can conveniently conduct out the heat generated in the dressing area 40, on the other hand, the current can conveniently flow in the battery 100 quickly, stable current can be generated in the battery 100, the working performance of the battery 100 can be ensured to be stable, the arrangement can improve the heat dissipation performance of the battery 100 and ensure the working stability of the battery 100, the functionality of parts of the battery 100 can be increased, the structure of the battery 100 can be further simplified, the internal structural compactness of the battery 100 can be improved, and the surface of the current collector is not coated with a heat conducting layer due to the fact that the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32 have heat conductivity. In the embodiment of the present utility model, the positive electrode heat conducting portion 22 is preferably made of aluminum, and the negative electrode heat conducting portion 32 is preferably made of copper.

In the embodiment of the present utility model, the thickness of the heat conductive layer is d1, and d1 satisfies the relation: d1 is less than or equal to 1 mu m and less than or equal to 5 mu m. Specifically, the thickness of the heat conductive layer is d1, and d1 satisfies the relation: the thickness of the heat conducting layer is set to be 1 μm or less and d1 μm or less and 5 μm or less, and the thickness of the heat conducting layer is set to be 1 μm to 5 μm, so that the production cost of the battery 100 can be maintained on the premise of ensuring the heat conducting performance of the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32, and in the embodiment of the utility model, the heat conducting layer is coated on the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32 through water-based roller coating, and the material of the heat conducting layer is a good heat conductor.

In an embodiment of the utility model, the thermally conductive layer comprises at least one of graphite, carbon nanotubes, graphene, and conductive carbon black. Specifically, in the embodiment of the present utility model, the heat conductive layer may be coated on the current collector by roll coating or extrusion coating, and the material of the heat conductive layer includes, but is not limited to, at least one of graphite, carbon nanotubes, graphene and conductive carbon black, which has good chemical stability, has strong oxidation resistance and reduction resistance, can make the heat conductive layer have good adsorptivity and thermal conductivity, and can ensure stable and reliable operation performance of the heat conductive layer in the battery 100.

As shown in fig. 3 and 4, a plurality of heat conductive and insulating modules 10 are provided in the case, the plurality of heat conductive and insulating modules 10 are provided on both sides of the dressing region 40, and the plurality of heat conductive and insulating modules 10 are stacked in the stacking direction of the positive electrode sheet 20 and the negative electrode sheet 30 and are in contact with the case. Specifically, a plurality of heat conducting and insulating modules 10 are arranged in the shell, the heat conducting and insulating modules 10 can conduct out the heat in the battery 100, the current in the battery 100 can be prevented from being transferred to the shell, the plurality of heat conducting and insulating modules 10 are arranged on two sides of the dressing area 40, so that the heat transfer between the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32 and the heat conducting and insulating modules 10 can be facilitated, the plurality of heat conducting and insulating modules 10 are arranged in a lamination mode in the lamination direction of the positive electrode sheet 20 and the negative electrode sheet 30, the heat generated by the plurality of positive electrode sheets 20 and the negative electrode sheet 30 in operation can be guaranteed to be transferred to the plurality of heat conducting and insulating modules 10, the heat dissipation efficiency of the battery 100 can be improved, the temperature in the battery 100 can be more uniform, the plurality of heat conducting and insulating modules 10 are in contact with the shell, the heat transferred to the plurality of heat conducting and insulating modules 10 can be directly transferred to the shell, and the shell is in contact with air in a large area, and a good heat dissipation effect can be achieved.

Further, the positive electrode heat conducting portion 22 is inserted between two adjacent heat conducting and insulating modules 10 at one side of the dressing region 40 and is in contact with the heat conducting and insulating modules 10, so that both sides of the positive electrode heat conducting portion 22 can be in contact with the heat conducting and insulating modules 10, the transfer efficiency of heat between the positive electrode heat conducting portion 22 and the heat conducting and insulating modules 10 can be improved, the heat generated on the positive electrode sheet 20 can be rapidly led out, the negative electrode heat conducting portion 32 is inserted between two adjacent heat conducting and insulating modules 10 at the other side of the dressing region 40 and is in contact with the heat conducting and insulating modules 10, both sides of the negative electrode heat conducting portion 32 can be in contact with the heat conducting and insulating modules 10, the transfer efficiency of heat between the negative electrode heat conducting portion 32 and the heat conducting and insulating modules 10 can be improved, and the heat generated on the negative electrode sheet 30 can be rapidly led out.

According to some embodiments of the present utility model, one positive electrode heat conducting portion 22 or one negative electrode heat conducting portion 32 is inserted into two adjacent heat conducting and insulating modules 10. Specifically, one positive electrode heat conducting portion 22 or one negative electrode heat conducting portion 32 is inserted into two adjacent heat conducting and insulating modules 10, so that on one hand, both sides of the positive electrode heat conducting portion 22 can be in contact with the heat conducting and insulating modules 10, the transfer efficiency of heat between the positive electrode heat conducting portion 22 and the heat conducting and insulating modules 10 can be improved, the heat generated on the positive electrode plate 20 can be quickly led out, on the other hand, both sides of the negative electrode heat conducting portion 32 can be in contact with the heat conducting and insulating modules 10, the transfer efficiency of heat between the negative electrode heat conducting portion 32 and the heat conducting and insulating modules 10 can be improved, the heat generated on the negative electrode plates 30 can be quickly led out, and in this way, the heat of each layer of the positive electrode plates 20 and the negative electrode plates 30 can be quickly led out when the positive electrode plates are stacked, and the temperature uniformity of the dressing region 40 in the battery 100 can be ensured.

According to other embodiments of the present utility model, a plurality of positive electrode heat conducting portions 22 or a plurality of negative electrode heat conducting portions 32 are inserted into two adjacent heat conducting and insulating modules 10. Specifically, a plurality of positive electrode heat conducting portions 22 or a plurality of negative electrode heat conducting portions 32 are inserted into two adjacent heat conducting and insulating modules 10, on one hand, the installation steps between the heat conducting and insulating modules 10 and the positive electrode heat conducting portions 22 or the negative electrode heat conducting portions 32 can be simplified, the production efficiency of the battery 100 can be improved, and the heat of the positive electrode heat conducting portions 22 and the negative electrode heat conducting portions 32 can be led out by the heat conducting and insulating modules 10, so that the heat dissipation efficiency of the battery 100 can be ensured, and on the other hand, the heat of each layer of the positive electrode plates 20 and the negative electrode plates 30 can be led out quickly when the heat is arranged in a stacked mode, so that the temperature uniformity of the dressing area 40 in the battery 100 can be ensured.

In the embodiment of the present utility model, the heat-conducting and insulating module 10 is an elastic heat-conducting and insulating module, the thickness of the plurality of heat-conducting and insulating modules 10 at two sides of the dressing area 40 is equal, and the thickness of the heat-conducting and insulating modules is the same as the thickness of the inside of the shell, and two ends of the plurality of heat-conducting and insulating modules 10 in the stacking direction are elastically and closely contacted with the inner wall of the shell. Specifically, the heat conduction insulating module 10 is set to be an elastic heat conduction insulating module, elastic deformation can occur when the elastic heat conduction insulating module has a heat sleeving function, the positive electrode heat conduction part 22 and the negative electrode heat conduction part 32 can be conveniently inserted into the heat conduction insulating module 10, the thicknesses of the heat conduction insulating modules 10 at two sides of the dressing area 40 are equal to each other and are the same as the thickness of the inner part of the shell, so that the heat conduction insulating module 10 can be conveniently produced and processed, the heat conduction insulating module 10 can be further arranged in the shell, the inner wall of the shell is ensured to be smooth, the structural arrangement of the positive electrode plate 20 and the negative electrode plate 30 can be conveniently realized, the structural compactness of the inner part of the battery 100 can be improved, heat can be conveniently transferred between the heat conduction insulating module 10 and the shell, and the two ends of the lamination direction of the heat conduction insulating modules 10 are elastically clung to the inner wall of the shell to be contacted, the contact area between the heat conduction insulating module 10 and the inner wall of the shell is the largest, and the heat transfer efficiency between the heat conduction insulating module 10 and the shell is prevented from being reduced due to the fact that gaps are generated between the heat conduction insulating module 10 and the shell.

As shown in fig. 3, the area of the heat conduction and insulation module 10 is larger than the area of the positive electrode heat conduction portion 22 and the area of the negative electrode heat conduction portion 32, and the side surface of the heat conduction and insulation module 10 is elastically in close contact with the inner wall of the housing. Specifically, the area of the heat conducting and insulating module 10 is larger than the area of the positive electrode heat conducting part 22 and the area of the negative electrode heat conducting part 32, so that the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32 can be ensured to be completely inserted into the heat conducting and insulating module 10, the heat conducted out of the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32 can be ensured to be completely transferred to the heat conducting and insulating module 10, the heat conducted out of the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32 can be prevented from being contacted with electrolyte, the heat conducted out of the positive electrode heat conducting part 22 and the negative electrode heat conducting part 32 is prevented from being transferred to the electrolyte, the temperature of the electrolyte is increased, the side surface of the heat conducting and insulating module 10 is in elastic close contact with the inner wall of the shell, the contact area between the heat conducting and insulating module 10 and the inner wall of the shell can be ensured to be ensured, and the heat transfer efficiency between the heat conducting and insulating module 10 and the shell can be prevented from being reduced due to gaps generated between the heat conducting and insulating module 10 and the shell. In the embodiment of the present utility model, the length of the heat conductive and insulating module 10 beyond the positive electrode heat conductive part 22 or the negative electrode heat conductive part 32 is 2-10mm.

In an embodiment of the present utility model, the heat conductive insulating module 10 includes at least one of heat conductive silica gel, heat conductive silica flakes, heat conductive rubber, and heat conductive latex. Specifically, the heat-conducting insulating module 10 includes, but is not limited to, at least one of heat-conducting silica gel, a heat-conducting silica gel sheet, heat-conducting rubber and heat-conducting emulsion, so that the performance of the heat-conducting insulating module 10 inside the battery 100 can be stable, the heat conductivity is good, the heat generated by the positive electrode sheet 20 and the negative electrode sheet 30 can be led out to the shell, and further the heat dissipation of the battery 100 can be accelerated, the heat dissipation of the battery 100 can be improved, and the use safety of the battery 100 can be improved.

The utility model will now be described in further detail by way of example only with reference to the accompanying drawings.

The examples were comparative verified based on the following 16Ah cell design:

the proportion of the positive plate 20 dressing is as follows: LFP: CNT: SP: PVDF=96.5%: 0.5%: 1.5%;

the positive plate 20 is coated with 419g/m2 of double-sided density, 2.57g/cc of compacted density and 0.176mm of plate thickness;

the positive electrode current collector is 13um Al foil;

the dressing proportion of the negative plate 30 is as follows: artificial graphite, CMC, SBR=97.2% 0.8% 1.0%;

the double-sided density of the negative electrode plate 30 dressing is 198g/m2, the compaction density is 1.52g/cc, and the thickness of the electrode plate is 0.138mm;

the negative electrode current collector is 8um Cu foil;

the positive and negative plates are produced by a gap coating method, the positive electrode 27pcs and the negative electrode 28pcs of the battery cell are manufactured, and the 18um PP base film is used as the diaphragm. Pole piece thickness 9.61mm, aluminum hull size: length x width x height = 98 x 100 x 10.5mm, aluminum can wall thickness 0.25mm, core-to-can assembly ratio 96.1%.

Experiment 1 specifically comprises: in this example, the positive electrode dressing portion 21 is 80mm wide, the positive electrode heat conduction portion 22 is 10mm wide, the positive electrode heat conduction portion 22 is coated with a 3um carbon nanotube and conductive carbon black mixed layer, and the positive electrode sheet 20 is 100mm long. The width of the negative electrode dressing part 31 is 84mm, the width of the negative electrode heat conduction part 32 is 10mm, the negative electrode heat conduction part 32 is not coated, and the length of the negative electrode sheet 30 is 104mm. The pole core is assembled through the lamination, and the heat conduction and insulation module 10 uses heat conduction silica gel, and the size of the heat conduction silica gel is as follows: length-width-thickness=104×14×1mm, number 10pcs, and heat conductive portions of the positive and negative electrode sheets are inserted into gaps of adjacent heat conductive and insulating modules 10 every 3 pcs. And assembling the pole core into an aluminum shell, and completing the manufacturing procedures of liquid injection, chemical composition, and the like to produce the complete battery core.

Experiment 2 specifically was: in this example, the positive electrode dressing portion 21 is 80mm wide, the positive electrode heat conduction portion 22 is 10mm wide, the positive electrode heat conduction portion 22 is coated with graphene of 1um, and the positive electrode sheet 20 is 100mm long. The width of the negative electrode dressing part 31 is 84mm, the width of the negative electrode heat conduction part 32 is 10mm, the negative electrode heat conduction part 32 is coated with a 2um conductive carbon black and graphite mixed layer, and the length of the negative electrode sheet 30 is 104mm. The pole core is assembled through the lamination, and the heat conduction and insulation module 10 uses heat conduction silica gel, and the size of the heat conduction silica gel is as follows: length-width-thickness=104×14×2.5mm, number 4pcs, and each 9pcs of the heat conducting parts of the positive and negative electrode plates is inserted into the gap of the adjacent heat conducting and insulating module 10. And assembling the pole core into an aluminum shell, and completing the manufacturing procedures of liquid injection, chemical composition, and the like to produce the complete battery core.

Experiment 3 specifically comprises: in this example, the positive electrode dressing portion 21 is 80mm wide, the positive electrode heat conduction portion 22 is 10mm wide, the positive electrode heat conduction portion 22 is uncoated, and the positive electrode sheet 20 is 100mm long. The width of the negative electrode dressing part 31 is 84mm, the width of the negative electrode heat conduction part 32 is 10mm, the negative electrode heat conduction part 32 is not coated, and the length of the negative electrode sheet 30 is 104mm. The lamination is assembled into a pole core, and the heat-conducting insulating module 10 uses heat-conducting rubber, and the size of the heat-conducting rubber is as follows: length-width-thickness=104×14×2.5mm, number 4pcs, and each 9pcs of the heat conducting parts of the positive and negative electrode plates is inserted into the gap of the adjacent heat conducting and insulating module 10. And assembling the pole core into an aluminum shell, and completing the manufacturing procedures of liquid injection, chemical composition, and the like to produce the complete battery core.

The control experiment is specifically: in this example, the positive electrode dressing portion 21 is 80mm wide, no heat conduction portion is provided, and the positive electrode sheet 20 is 100mm long. The negative electrode dressing portion 31 was 84mm wide, no heat conducting portion was present, and the negative electrode sheet 30 was 104mm long. The pole core is assembled by lamination, the insulating modules are not placed at the left side and the right side, the pole core is assembled into an aluminum shell, and manufacturing procedures of liquid injection, chemical composition, and the like are completed, so that the complete battery core is produced.

The 2C rate charge and discharge test steps specifically comprise: placing in an incubator at 25+/-2 ℃ for 4 hours; the battery cell is charged to 3.8V with a constant current of 32A; standing for 60 minutes; constant current discharge to 2.0V at a current of 32A; rest for 30 minutes.

The experimental results are shown in the following figures:

sequence number	Temperature before charging	Post-charge temperature	Charging temperature rise	Temperature before discharge	Post discharge temperature	Discharge temperature rise
							Experiment 1	25.60	37.5	11.9	26.00	38.7	12.7
Experiment 2	25.40	38.2	12.8	25.80	39.5	13.7
							Experiment 3	25.50	38.8	13.3	26.00	40.2	14.2
Control group	25.50	41.7	16.2	25.80	45.1	19.3

According to the experimental results, the battery can generate heat in the charging and discharging process, the heat cannot be timely led out, and the temperature rise of the battery core can be caused. The experimental group timely conducts the heat of the pole piece to the aluminum shell, so that the heat dissipation capacity is improved, and the temperature rise of the battery cell is low.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A battery (100), characterized by comprising:

a housing;

the positive plate (20), the positive plate (20) is arranged in the shell and comprises a positive dressing part (21) and a positive heat conduction part (22), the positive heat conduction part (22) is arranged at one side of the positive dressing part (21), and the number of the positive plates (20) is multiple;

negative pole piece (30), negative pole piece (30) set up in just including negative pole dressing portion (31) and negative pole heat conduction portion (32) in the casing, negative pole heat conduction portion (32) set up in one side of negative pole dressing portion (31), negative pole piece (30) be a plurality of, a plurality of positive pole piece (20) and a plurality of negative pole piece (30) are the range upon range of setting in turn, a plurality of positive pole dressing portion (21) and a plurality of negative pole dressing portion (31) each other coincide and form dressing district (40) jointly, positive pole heat conduction portion (22) with negative pole heat conduction portion (32) are located respectively dressing district (40) both sides.

2. The battery (100) according to claim 1, wherein the areas of the positive electrode dressing portion (21) and the negative electrode dressing portion (31) are equal and are both a, the areas of the positive electrode heat conduction portion (22) and the negative electrode heat conduction portion (32) are equal and are both b, and a and b satisfy the relation: a/b > 2.

3. The battery (100) of claim 1, wherein the positive electrode thermally conductive portion (22) and the negative electrode thermally conductive portion (32) are both current collectors, the current collector surfaces being coated with a thermally conductive layer; and/or

The surface of the current collector is not coated with a heat conducting layer.

4. The battery (100) of claim 3, wherein the thermally conductive layer has a thickness d1, d1 satisfying the relationship: d1 is less than or equal to 1 mu m and less than or equal to 5 mu m.

5. The battery (100) of claim 3, wherein the thermally conductive layer comprises at least one of graphite, carbon nanotubes, graphene, and conductive carbon black.

6. The battery (100) according to claim 1, wherein a plurality of heat-conducting insulating modules (10) are provided in the case, the plurality of heat-conducting insulating modules (10) are provided on both sides of the dressing region (40), the plurality of heat-conducting insulating modules (10) are provided in a stacked manner in a stacking direction of the positive electrode sheet (20) and the negative electrode sheet (30) and are in contact with the case, the positive electrode heat-conducting portion (22) is interposed between two heat-conducting insulating modules (10) adjacent to one side of the dressing region (40) and is in contact with the heat-conducting insulating modules (10), and the negative electrode heat-conducting portion (32) is interposed between two heat-conducting insulating modules (10) adjacent to the other side of the dressing region (40) and is in contact with the heat-conducting insulating modules (10).

7. The battery (100) according to claim 6, wherein one of the positive electrode heat conduction portions (22) or one of the negative electrode heat conduction portions (32) is interposed between two adjacent heat conduction and insulation modules (10); and/or

A plurality of positive electrode heat conducting parts (22) or a plurality of negative electrode heat conducting parts (32) are inserted into two adjacent heat conducting and insulating modules (10).

8. The battery (100) according to claim 6, wherein the heat conductive insulating module (10) is an elastic heat conductive insulating module, the thickness of the plurality of heat conductive insulating modules (10) on both sides of the dressing region (40) is equal to the thickness of the inside of the case, and both ends of the plurality of heat conductive insulating modules (10) in the stacking direction are in elastic close contact with the inner wall of the case.

9. The battery (100) of claim 8, wherein the area of the thermally conductive and insulating module (10) is greater than the area of the positive electrode thermally conductive portion (22) and the area of the negative electrode thermally conductive portion (32), and wherein the side surface of the thermally conductive and insulating module (10) is in elastic, intimate contact with the inner wall of the housing.

10. The battery (100) of claim 8, wherein the thermally conductive insulating module (10) comprises at least one of thermally conductive silicone gel, thermally conductive silicone sheet, thermally conductive rubber, and thermally conductive latex.

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