CN216450683U - Battery pole piece, battery core, battery and battery device - Google Patents

Abstract

The utility model discloses a battery pole piece, an electric core, a battery and a battery device.A first electrode material with higher heat resistance is arranged on the first surface of a current collector, and a second electrode material with lower heat resistance is arranged on the second surface of the current collector, so that the composite use of two electrode materials with different heat resistance is realized to manufacture the battery pole piece, thus the heat resistance and the safety of the battery pole piece can be improved, the heat resistance and the safety performance of the electric core and even the battery can be further improved, the service life is prolonged, and the manufacturing cost can be favorably reduced to a certain extent; meanwhile, when the heat insulation material is applied to the battery device, the heat insulation material does not need to be additionally added, so that the effective utilization of space can be realized.

Description

Battery pole piece, battery core, battery and battery device

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pole piece, a battery core, a battery and a battery device.

Background

The ternary lithium battery is one of the mainstream technical schemes of the current automobile power battery due to the advantages of high energy density, excellent low-temperature performance and the like, but still has the following disadvantages:

1. the storage amount of the necessary cobalt element in the ternary lithium battery is small in China, so that the manufacturing cost of the ternary lithium battery is high, and a strict process environment is required for manufacturing the high-nickel battery, so that the production cost of the ternary lithium battery is increased;

2. the nickel element has active chemical properties, so that the safety problem of the ternary lithium battery is also outstanding;

3. the high temperature resistance of the manufacturing material of the ternary lithium battery is poor, and the normal working state is difficult to ensure in a high-temperature environment.

Although various techniques for inhibiting thermal runaway are developed and applied currently, on one hand, the thermal inhibition techniques have high requirements on manufacturing processes and material properties, which undoubtedly increase the production and manufacturing costs, and on the other hand, the method for inhibiting thermal runaway by enhancing heat insulation and inhibiting heat conduction occupies the space which can be designed and applied inside the battery module or the battery pack.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a battery pole piece, a battery core, a battery and a battery device, wherein two electrode materials with different heat resistance are compounded to be used for manufacturing the battery pole piece, so that the heat resistance of the battery pole piece can be improved, the safety of the battery core and even the battery can be further improved, the service life of the battery device can be prolonged, and the manufacturing cost can be reduced to a certain extent; meanwhile, when the heat insulating material is applied to the battery device, the heat insulating material is not required to be additionally added, so that the effective utilization of space can be realized.

In a first aspect, an embodiment of the present invention provides a battery pole piece, including a current collector, where the current collector has a first surface and a second surface that are oppositely disposed, the first surface is provided with a first electrode material, the second surface is provided with a second electrode material, and a heat resistance of the first electrode material is greater than a heat resistance of the second electrode material.

The first electrode material with higher heat resistance is arranged on the first surface, and the second electrode material with lower heat resistance is arranged on the second surface, so that the two electrode materials with different heat resistance are combined to be used for manufacturing the battery pole piece, the heat resistance of the battery pole piece can be improved, the service life of the battery pole piece can be prolonged, and the manufacturing cost can be reduced to a certain extent.

In a second aspect, an embodiment of the present invention provides an electrical core, including: the battery pole piece provided by the embodiment of the utility model.

Through the setting to battery pole piece in the battery, realized using two kinds of electrode material composite that have different heat resistances for the preparation battery pole piece, so, can improve battery pole piece's heat resistance, and then improve the heat resistance of electric core, increase of service life to can be favorable to reducing the cost of manufacture to a certain extent.

In a third aspect, an embodiment of the present invention provides a battery, including: the battery cell provided by the embodiment of the utility model.

Through the setting to battery sheet in the battery, realized using two kinds of electrode material composite that have different heat resistances for the preparation battery sheet, so, can improve battery sheet's heat resistance, and then improve the heat resistance of battery, prolong the life of battery to can be favorable to reducing the cost of manufacture to a certain extent.

In a fourth aspect, an embodiment of the present invention provides a battery device, including: the battery provided by the embodiment of the utility model.

The safety performance of the battery device can be improved, the service life is prolonged, and the manufacturing cost can be reduced to a certain extent by arranging the battery pole piece in the battery; meanwhile, an additional heat insulation material is not required, so that the space in the battery device can be effectively utilized.

Drawings

Fig. 1 is a schematic structural diagram of a battery pole piece provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a battery cell provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of another electrical core provided in the embodiment of the present invention;

FIG. 4 is a schematic plan view taken along the planes indicated at F1 and F3 in FIG. 3;

fig. 5 is a schematic structural diagram of a winding type battery cell provided in an embodiment of the present invention;

FIG. 6 is a schematic diagram illustrating a state of an unwound pole piece set according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a battery provided in an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a battery device according to an embodiment of the present invention.

10. 10 c-positive pole piece, 11a, 11 c-current collector, 20a, 20 c-first diaphragm, 30a, 30E-negative pole piece, 40a, 40B, 40 c-pole piece group, 50-second diaphragm, 60-shell, 70-third diaphragm, D1-first electrode material, D2-second electrode material, B1-first surface, B2-second surface, E-pole ear, x1, x 2-cell, 100-battery, Z-winding shaft.

Detailed Description

Specific embodiments of a battery pole piece, a battery cell, a battery and a battery device according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, a plurality of the references mentioned in the embodiments of the present invention may be understood as follows: two or more.

The embodiment of the utility model provides a battery pole piece, as shown in fig. 1, the battery pole piece may include a current collector 11, the current collector 11 has a first surface B1 and a second surface B2 which are oppositely arranged, the first surface B1 is provided with a first electrode material D1, the second surface B2 is provided with a second electrode material D2, and the heat resistance of the first electrode material D1 is greater than that of the second electrode material D2.

In fig. 1, the structure in the dashed box 1 is a partially enlarged schematic structural diagram, the electrode materials disposed on the first surface B1 and the second surface B2 of the current collector 11 are shown in the dashed box 1, and different electrode materials are represented by different filling patterns.

To illustrate, in fig. 1, in addition to the structure within the dotted line frame 1, a schematic perspective structure of the battery pole piece is shown, and the first surface and the first electrode material are not embodied due to the problem of the viewing angle.

The first electrode material with higher heat resistance is arranged on the first surface of the current collector, and the second electrode material with lower heat resistance is arranged on the second surface of the current collector, so that the two electrode materials with different heat resistance are combined for manufacturing the battery pole piece, the heat resistance of the battery pole piece can be improved, the service life of the battery pole piece can be prolonged, and the manufacturing cost can be reduced to a certain extent.

Optionally, in the embodiment of the present invention, the battery pole piece is a positive pole piece, so that the positive pole piece has good heat resistance.

At this time, optionally, in an embodiment of the present invention, the first electrode material includes a lithium iron phosphate material, and the second electrode material includes a lithium-containing ternary oxide material.

When the lithium iron phosphate material is applied to a battery, the following advantages can be shown:

the manufacturing cost is low;

the safety is high;

longer cycle life, etc.

Specifically, the thermal runaway temperature of the lithium iron phosphate battery is generally above 500 ℃, the thermal runaway temperature of the lithium-containing ternary oxide battery is generally lower than 300 ℃, and the thermal runaway temperature of some high-nickel batteries is still lower than 100 ℃, compared with the situation that the lithium iron phosphate battery has lower spontaneous combustion risk and better safety in the process of high-speed running and quick charging of automobiles.

The lithium-containing ternary oxide battery has high energy density, good low-temperature resistance and high estimation accuracy of the state of charge during application.

Therefore, the lithium iron phosphate material is combined with the lithium-containing ternary system oxide, so that on one hand, the high temperature resistance of the battery pole piece can be improved, and the safety is improved, on the other hand, when the battery pole piece is applied to a battery cell and even a battery, the energy density and the low temperature resistance of the battery cell and even the battery can be improved, and meanwhile, the estimation precision of the state of charge can be improved, so that the comprehensive performance of the battery cell and even the battery is greatly improved.

Specifically, in the embodiment of the present invention, the first electrode material may include, in addition to the lithium iron phosphate material, other materials with a higher heat-resistant temperature, and the second electrode material may include, in addition to the lithium-containing ternary oxide material, other materials with a higher energy density and a higher estimation accuracy of the state of charge, which is not limited herein.

Of course, alternatively, in the embodiment of the present invention, it may also be configured to:

the battery pole piece is a negative pole piece.

That is to say, the battery pole piece can be set as the positive pole piece or the negative pole piece according to actual needs, so as to improve the flexibility of design and meet the needs of different application scenes.

Based on the same utility model concept, an embodiment of the present invention provides a battery cell, as shown in fig. 2, the battery cell may include: the battery pole piece (such as 10 or 30) provided by the embodiment of the utility model.

Through the setting to battery pole piece in the battery, realized using two kinds of electrode material composite that have different heat resistances for the preparation battery pole piece, so, can improve battery pole piece's heat resistance, and then improve the heat resistance of electric core, increase of service life to can be favorable to reducing the cost of manufacture to a certain extent.

Optionally, in the embodiment of the present invention, as shown in fig. 2, the battery pole piece is a positive pole piece 10;

the electric core further comprises: the positive electrode plate 10, the first diaphragm 20 and the negative electrode plate 30 are sequentially stacked; the adjacent positive pole piece 10, the first diaphragm 20 and the negative pole piece 30 form a pole piece group;

the battery core comprises at least one pole piece group.

Fig. 2 only shows one plate group, but this does not mean that the battery cell only includes the one plate group, and here, only one plate group is taken as an example for description; in an actual situation, the battery cell may include a plurality of pole piece groups, and the number of the pole piece groups specifically included may be set according to actual needs, which is not limited herein.

So, through the setting to first diaphragm, negative pole piece and positive pole piece for first diaphragm can separate positive pole piece and negative pole piece, avoids taking place the short circuit between positive pole piece and the negative pole piece, and then makes the electric core of constitution can realize the function of charge-discharge.

Specifically, in the embodiment of the present invention, the battery cell may be a laminated battery cell or a wound battery cell, and may be set according to actual needs, so as to improve flexibility of design and meet requirements of different application scenarios.

The following description is made for each of the cells having different structures.

1. Laminated battery cell.

Optionally, in an embodiment of the present invention, the battery cell is a laminated battery cell;

the positive pole piece is provided with a positive pole piece, and a first electrode material is arranged on the surface of one side, away from the first diaphragm, of a current collector in the positive pole piece;

or, the pole piece group sets up a plurality ofly, and any pole piece group in two pole piece groups that are located the outermost side in all pole piece groups: the first electrode material is arranged on one side surface of the current collector in the positive pole piece, which faces away from the other pole piece group.

For example, as shown in fig. 2, when the cell includes a plate assembly, the first electrode material D1 is disposed on a side surface of the current collector 11 facing away from the first separator 20 in the positive electrode plate 10.

For another example, fig. 4 is a schematic plan view of the planes shown by F1 and F3 in fig. 3, in which three pole piece groups (40 a, 40b, and 40c, respectively) are shown, and the pole piece group 40a located at the leftmost side and the pole piece group 40c located at the rightmost side are two outermost pole piece groups in all the pole piece groups, so for the pole piece group 40 a:

as shown in the enlarged partial view in the dashed box 2, the first electrode material D1 is disposed on a side surface of the current collector 11a in the positive electrode tab facing away from the tab group 40c, that is, on a left side surface of the current collector 11 a;

for plate group 40 c:

as shown in the enlarged partial view in the dashed-line frame 3, the first electrode material D1 is disposed on the surface of the positive electrode sheet on the side of the current collector 11c facing away from the sheet group 40a, that is, on the right surface of the current collector 11 c.

So, to arbitrary slice group in two slice groups in the outermost side in whole slice group, first electrode material in the positive pole piece is located the outside, and second electrode material is located the inboard for first electrode material can be with second electrode material clamp in the centre, get up second electrode material protection through first electrode material, avoid the heat on every side to cause harmful effects to second electrode material, thereby can effectively improve the heat resistance and the security of electric core.

Optionally, in the embodiment of the present invention, the number of the pole piece groups is N;

n is the even number, divides into two pole piece group sets all pole piece groups, and every pole piece group set includes: n/2 pole piece groups which are adjacently arranged; or, N is an odd number, the pole piece group positioned in the middle of all the pole piece groups is defined as a reference pole piece group, the (N-1)/2 pole piece groups positioned on one side surface of the reference pole piece group are defined as a pole piece group set, and the (N-1)/2 pole piece groups positioned on the other side surface of the reference pole piece group are defined as another pole piece group set;

wherein, for any slice group set: the first electrode material is arranged on one side, facing away from the other pole piece set, of the current collector in the positive pole piece.

For example, as shown in fig. 4 as an example, N is 3 and is an odd number, so the middle pole piece group 40b may be defined as a reference pole piece group, all the pole piece groups on the left side of the reference pole piece group form one pole piece group set, and the pole piece group set only includes the pole piece group 40a, all the pole piece groups on the right side of the reference pole piece group form another pole piece group set, and the pole piece group set only includes the pole piece group 40 c.

Of course, the value of N is not limited to 3, but may be 2, 4, 5 or other values, and is not limited herein.

So, can set up a plurality of positive pole pieces in the electric core for two relative surfaces of mass flow body are provided with first electrode material and second electrode material respectively in a plurality of positive pole pieces, and make more positive pole piece's first electrode material be located the outside, and more second electrode material is located the inboard, thereby can protect second electrode material more effectively, effectively improve the heat resistance and the security of electric core.

Optionally, in an embodiment of the present invention, the battery cell is a laminated battery cell;

aiming at the pole piece group positioned at the outermost side in all the pole piece groups:

if the pole piece that is located the outside is positive pole piece, electric core still includes: the third diaphragm, the negative pole piece and the third diaphragm are sequentially arranged on one side, away from the first diaphragm, of the positive pole piece;

if the pole piece that is located the outside is the negative pole piece, electric core still includes: and the third diaphragm is arranged on one side of the negative pole piece, which is far away from the first diaphragm.

For example, as shown in fig. 4, the outermost pole piece groups in all the pole piece groups are a pole piece group 40a and a pole piece group 40c, and for the pole piece group 40 a:

the pole piece that is located the outermost side is negative pole piece 30a, and electric core still includes this moment: a third separator 70 provided on the side of the negative electrode tab 30a facing away from the first separator 20a (i.e., the left side as viewed in the drawing);

for the pole piece set 40 c:

the pole piece that is located the outside is positive pole piece 10c, and electric core still includes this moment: a third separator 70, a negative electrode sheet 30e, and a third separator 70 that are disposed in this order on the side of the positive electrode sheet 10c facing away from the first separator 20c (i.e., on the right side as viewed in the drawing).

This is so:

on one hand, the positive pole piece can play a role to a greater extent, and waste is avoided; meanwhile, the manufacturing cost of the negative pole piece is generally lower, so that the arrangement does not cause great cost increase, the effect of each pole piece can be exerted to the maximum extent within a reasonable manufacturing cost range, and the performance of the battery is improved;

on the other hand, when a plurality of battery cores are combined to form the battery, the pole pieces in the two battery cores can be prevented from being short-circuited, so that the normal work of the battery can be ensured.

2. A winding type battery cell.

Optionally, in an embodiment of the present invention, the battery cell is a winding battery cell;

the second electrode material is arranged on one side surface, facing a winding shaft of the winding type battery cell, of a current collector of the positive pole piece, and the first electrode material is arranged on one side surface, facing away from the winding shaft, of the current collector.

Wherein, winding-type electricity core can understand:

the structure of the positive electrode 10 ', the separator 20 ', the negative electrode 30 ', and the separator 20f, which are stacked in this order from top to bottom and have a band shape, is shown in fig. 6, and is formed by winding them around a winding axis Z, as shown in the schematic diagram of the wound structure shown in fig. 5.

To illustrate, the strip-shaped diaphragm 20f is arranged, so that short circuit between pole pieces is avoided during winding, and the normal operation of the battery cell can be ensured. Meanwhile, in a practical case, the strip-shaped separator 20 'may be provided longer than the strip-shaped positive electrode 10' (i.e., longer in the extending direction) so that in a winding type, stacking between parts of the positive electrodes may be avoided.

In fig. 5, an enlarged schematic configuration diagram inside the dashed line frame 4 shows a laminated relationship of four belt-like structures after winding. Here, the strip-shaped positive electrode 10 'may be regarded as a positive electrode sheet, the middle strip-shaped separator 20' may be regarded as a first separator, and the strip-shaped negative electrode 30 'may be regarded as a negative electrode sheet, and in this case, the strip-shaped positive electrode 10', the strip-shaped separator 20 ', and the strip-shaped negative electrode 30' constitute a single electrode sheet group.

In addition, as shown in fig. 6, when winding, the left end of the pole piece group shown in the figure can be used as a starting point, winding is carried out along the direction indicated by the arrow in the figure, and the result shown in fig. 5 is obtained after winding.

Of course, at the time of winding, winding may be performed in a direction indicated by an arrow with a right end shown in the drawing as a starting point, and a result after winding is not shown.

Explaining one point, the first electrode material and the second electrode material are not shown in fig. 6.

Note that, as shown in fig. 5 and 6, the negative electrode 30' in a band shape needs to be held at the outermost side of the cell at the time of winding; in the unwound state, the surface of the strip-shaped positive electrode 10 ' facing the strip-shaped separator 20 ' is the first surface B1, and the surface facing away from the strip-shaped separator 20 ' is the second surface B2, as shown in fig. 6; in this way, during winding, it is ensured that the first electrode material D1 is always on the outside, the second electrode material D2 is on the inside, and the second electrode material D2 is disposed on the surface of the current collector facing the winding axis Z of the wound cell, and the first electrode material D1 is disposed on the surface of the current collector facing away from the winding axis Z (as shown in fig. 5).

Therefore, the first electrode material can protect the second electrode material inside, the second electrode material is protected through the first electrode material, adverse effects of surrounding heat on the second electrode material are avoided, and therefore heat resistance and safety of the battery cell can be effectively improved.

In short, whether the structure of the battery cell is a laminated type or a winding type, as long as the second electrode material can be protected by the first electrode material, the heat resistance and the safety of the battery cell are improved, and the protection scope of the embodiment of the utility model is included.

Optionally, in the embodiment of the present invention, as shown in fig. 3, a plurality of pole piece groups 40 are provided, each pole piece group 40 is stacked along a first direction (i.e., an F1 direction), where the first direction F1 is: the arrangement directions of the positive pole piece, the first diaphragm and the negative pole piece are the same;

a second diaphragm 50 is disposed between two adjacent pole piece groups 40.

The cell shown in fig. 3 is a laminated cell.

That is to say, no matter the structure of electric core is lamination formula or coiling formula, when pole piece group set up a plurality ofly, all can avoid taking place the short circuit between two pole piece groups through the interval of second diaphragm with each pole piece group to can guarantee that electric core can normally work.

Optionally, in the embodiment of the present invention, tabs E are disposed on both the positive electrode plate 10 and the negative electrode plate 30, as shown in fig. 2; the tab in the positive pole piece is a positive pole tab, and the tab in the negative pole piece is a negative pole tab.

Through the setting of utmost point ear, can draw forth outside electric core positive pole and negative pole to follow-up and other structure electricity are connected, realize the charge-discharge function of electric core.

To illustrate, the wound battery cell in fig. 5 is also provided with tabs, which are not shown in fig. 5.

Based on the same utility model concept, an embodiment of the present invention provides a battery, as shown in fig. 7, which may include: the battery cell provided by the embodiment of the utility model (such as x1 and x 2).

In an actual situation, the battery may include a plurality of battery cells, and the specific number of the battery cells may be set according to actual needs, which is not limited herein.

Through the setting to battery pole piece in the battery, realized using two kinds of electrode material composite that have different heat resistances for the preparation battery pole piece, so, can improve battery pole piece's heat resistance, and then improve the heat resistance of battery, the life of extension battery to can be favorable to reducing the cost of manufacture to a certain extent.

Optionally, in the embodiment of the present invention, as shown in fig. 7, the battery further includes a casing 60, where the cell x is located in the casing 60;

when the battery pole piece is the positive pole piece, for the positive pole piece in the battery cell: the material of the first electrode material D1 and the second electrode material D2 that is disposed closer to the case 60 is the first electrode material D1.

For example, as shown in fig. 7, for the cell x1, since it is disposed relatively to the left, the first electrode material D1 is disposed on the left side, and the second electrode material D2 is disposed on the right side, so that the first electrode material D1 is disposed closer to the casing; for the cell x2, since it is disposed relatively to the right, the first electrode material D1 is disposed on the right side, and the second electrode material D2 is disposed on the left side, so that the first electrode material D1 is disposed closer to the casing.

So, if the first surface that will be provided with first electrode material is close to the casing setting, can make first electrode material set up in the outside, second electrode material sets up in the position that leans on the inside relatively, when thermal runaway appears between the battery, can make the heat contact first electrode material earlier, later with the second electrode material of heat transfer to the inboard again, thereby, through first electrode material's high temperature resistant performance, can form the protection to second electrode material, avoid external heat to produce harmful effects to second electrode material, improve the battery and resist the ability of thermal runaway, improve the security of battery.

Of course, in practical cases, it can also be set as:

the material of the first electrode material and the second electrode material disposed closer to the case is the second electrode material, and illustration is not given.

That is, the first electrode material is disposed relatively inward and the second battery material is disposed outward; if a plurality of battery cells are stacked, the stacking sequence of the battery cells needs to be set, so that the thermal runaway resistance of the battery can be improved, and the safety of the battery can be improved.

The stacking sequence of the battery cells can be set according to actual needs, and the first electrode material can protect the second electrode material through the cooperation of the battery cells, which all belong to the protection scope of the embodiment of the present invention.

Optionally, in an embodiment of the present invention, the first diaphragm, the second diaphragm, and the third diaphragm are made of the same material.

Therefore, the manufacturing process of the battery can be simplified, and the manufacturing cost of the battery can be reduced.

Specifically, in the embodiment of the present invention, the manufacturing materials of the first diaphragm, the second diaphragm, and the third diaphragm may each include: a polyolefin-based polymer.

In practical applications, the material for manufacturing the first diaphragm, the second diaphragm, and the third diaphragm is not limited to the above material, and may be other materials that can achieve the function of the diaphragm, and is not limited herein.

Optionally, in an embodiment of the present invention, a material of the negative electrode tab includes graphite.

Of course, the material for making the negative electrode plate may include other materials capable of achieving the function of the negative electrode plate besides graphite, and is not limited herein.

Based on the same utility model concept, an embodiment of the present invention provides a battery device, as shown in fig. 8, including: such as the battery 100 provided by the embodiments of the present invention.

Optionally, in an embodiment of the present invention, the battery device may be: a battery pack (as shown in fig. 8), a battery module (not shown), or a battery pack (not shown).

Alternatively, in the embodiment of the present invention, the number of the batteries 100 included in the battery device may be multiple, such as four as shown in fig. 8, but is not limited to four, and in an actual situation, the number of the batteries 100 included in the battery device may be set according to an actual need, and is not limited herein.

Optionally, in the embodiment of the present invention, the battery device may include, in addition to the battery, other structures for implementing functions of the battery device, and is not limited herein.

The battery pole piece is made of two electrode materials with different heat resistance, so that the heat resistance of the battery pole piece can be improved, the heat resistance of the battery can be further improved, the service life of the battery can be prolonged, and the manufacturing cost can be reduced to a certain extent.

Meanwhile, when thermal runaway occurs in a certain battery in the battery device, if the first electrode material is arranged on the outer side, the second electrode material is arranged on the inner side, the second electrode can be isolated from the outside through the first electrode material, and the first electrode material has better heat resistance, so that the battery self has the effect of inhibiting the thermal runaway, heat is not easily transmitted to an adjacent battery, further expansion of the thermal runaway is avoided, influences on other batteries are reduced to the greatest extent, and the reliability of the battery device is effectively improved.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The utility model provides a battery pole piece, its characterized in that includes the mass flow body, the mass flow body has relative first surface and the second surface that sets up, first surface is provided with first electrode material, the second surface is provided with second electrode material, the heat resistance of first electrode material is greater than the heat resistance of second electrode material.

2. The battery tab of claim 1, wherein the battery tab is a positive electrode tab.

3. The battery pole piece of claim 1, wherein the first electrode material comprises a lithium iron phosphate material and the second electrode material comprises a lithium-containing ternary oxide material.

4. A battery cell, comprising: a battery pole piece as claimed in any one of claims 1 to 3.

5. The electrical core of claim 4, wherein the battery pole piece is a positive pole piece;

the battery cell further comprises: the positive pole piece, the first diaphragm and the negative pole piece are sequentially stacked; the adjacent positive pole piece, the first diaphragm and the negative pole piece form a pole piece group;

the battery cell comprises at least one pole piece group.

6. The cell of claim 5, wherein the cell is a laminated cell;

the positive pole piece is provided with a positive pole piece, and a current collector of a first electrode material is arranged on the surface of one side, away from the first diaphragm, of the positive pole piece;

or, the pole piece group is provided with a plurality of pole piece groups, and any one of the two pole piece groups located at the outermost side in all the pole piece groups is: the first electrode material is arranged on one side surface of a current collector in the positive pole piece, which faces away from the other pole piece group.

7. The battery cell of claim 6, wherein the number of the pole piece groups is N;

n is an even number, all the pole piece groups are divided into two pole piece group sets, and each pole piece group set comprises: n/2 pole piece groups are adjacently arranged; or, N is an odd number, the pole piece group positioned in the middle of all the pole piece groups is defined as a reference pole piece group, the (N-1)/2 pole piece groups positioned on one side surface of the reference pole piece group are defined as a pole piece group set, and the (N-1)/2 pole piece groups positioned on the other side surface of the reference pole piece group are defined as another pole piece group set;

wherein, for any one slice group set: the first electrode material is arranged on one side surface of a current collector in the positive pole piece, which faces away from the other pole piece set.

8. The cell of claim 5, wherein the cell is a wound cell;

the second electrode material is arranged on one side surface, facing the winding shaft of the winding type battery cell, of the current collector of the positive pole piece, and the first electrode material is arranged on one side surface, facing away from the winding shaft, of the current collector.

9. A battery, comprising: the cell of any of claims 4-8.

10. A battery device, comprising: the battery of claim 9.

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