CN118231558A - Electrode assembly, battery cell, battery and electric equipment - Google Patents

Abstract

The invention belongs to the technical field of batteries, and discloses an electrode assembly, a battery cell, a battery and electric equipment. The electrode assembly includes a plurality of bipolar electrode sheets, a positive electrode assembly, and a negative electrode assembly. The bipolar electrode plates comprise bipolar current collectors, first positive electrode material layers and first negative electrode material layers, the bipolar current collectors comprise first positive electrode conductive layers and first negative electrode conductive layers, and a plurality of bipolar electrode plates are stacked to form electrode plate groups. The positive electrode component comprises a second positive electrode conductive layer, one side of the second positive electrode conductive layer is provided with a positive electrode post, the other side of the second positive electrode conductive layer is provided with a second positive electrode material layer, and the second positive electrode material layer and the negative electrode of the pole piece group are oppositely arranged. The negative electrode component comprises a second negative electrode conductive layer, one side of the second negative electrode conductive layer is provided with a negative electrode post, the other side of the second negative electrode conductive layer is provided with a second negative electrode material layer, and the second negative electrode material layer is oppositely arranged with the positive electrode of the pole piece group. The electrode assembly can effectively improve the overcurrent capacity of the battery, so that the battery meets the use requirement of higher-power equipment.

Description

Electrode assembly, battery cell, battery and electric equipment

Technical Field

The invention relates to the technical field of batteries, in particular to an electrode assembly, a battery cell, a battery and electric equipment.

Background

With the development of new energy industry, the requirements of users on power batteries are higher and higher. The overcurrent capability of a battery is one of the important indicators for measuring the performance of the battery. The battery overcurrent capability refers to the maximum current that the battery can withstand when it is operating. Generally, the stronger the overcurrent capacity of the battery, the larger the current provided by the battery, so that the use requirement of higher-power equipment can be met.

For soft pack batteries, the bottleneck in their overcurrent capability is typically at the tab. Current paths of existing pouch cells are from the current collector to the tab. The tab is formed by die-cutting the edge of the current collector, and thus, the flow area of the current collector is determined by the area of the tab. Under normal conditions, the area of the electrode lug is smaller, so that the overcurrent capacity of the current collector is smaller, the overcurrent capacity of the whole battery is poorer, the overall overcurrent capacity of the electrode assembly can be improved to a certain extent by adopting a mode of increasing the thickness and the area of the electrode lug, but the lifting upper limit of the thickness and the area of the electrode lug is lower, and the effect of improving the overcurrent capacity can not be fundamentally realized.

Accordingly, there is a need to propose an electrode assembly and a method of manufacturing the same to solve the above-mentioned problems.

Disclosure of Invention

An object of the present invention is to provide an electrode assembly capable of effectively improving the overcurrent capability of a battery, thereby being capable of satisfying the use requirements of higher power devices.

To achieve the purpose, the invention adopts the following technical scheme:

An electrode assembly, comprising:

The bipolar pole pieces comprise bipolar current collectors, first positive electrode material layers and first negative electrode material layers, the bipolar current collectors comprise first positive electrode conductive layers and first negative electrode conductive layers, the first positive electrode material layers are arranged on one sides of the first positive electrode conductive layers far away from the first negative electrode conductive layers, the first negative electrode material layers are arranged on one sides of the first negative electrode conductive layers far away from the first positive electrode conductive layers, the bipolar pole pieces are arranged in a stacked mode to form pole piece groups, and one sides of the adjacent two bipolar pole pieces, which are opposite in electrical property, are arranged oppositely;

The positive electrode assembly comprises a second positive electrode conductive layer, one side of the second positive electrode conductive layer is provided with a positive electrode post, the other side of the second positive electrode conductive layer is provided with a second positive electrode material layer, and the second positive electrode material layer and the negative electrode of the pole piece group are oppositely arranged;

the negative electrode assembly comprises a second negative electrode conductive layer, a negative electrode pole is arranged on one side of the second negative electrode conductive layer, a second negative electrode material layer is arranged on the other side of the second negative electrode conductive layer, and the second negative electrode material layer and the positive electrode of the pole piece group are oppositely arranged.

Optionally, the positive electrode post and the second positive electrode conductive layer are integrally formed; and/or, the negative electrode post and the second negative electrode conductive layer are integrally formed.

Optionally, along the thickness direction of the pole piece group, the forward projection area S1 of the positive pole post and the forward projection area S2 of the second positive conductive layer satisfy the relationship: 0.01< S1/S2<0.8; and/or the number of the groups of groups,

Along the thickness direction of the pole piece group, the forward projection area S3 of the negative pole post and the forward projection area S4 of the second negative pole conductive layer satisfy the relation: 0.01< S3/S4<0.8.

Optionally, the thickness T1 of the positive electrode post and the thickness T2 of the second positive electrode conductive layer satisfy the relationship: 0.05< T1/T2<0.4; and/or the number of the groups of groups,

The thickness T3 of the anode post and the thickness T4 of the second anode conductive layer satisfy the relationship: 0.05< T3/T4<0.4.

Optionally, a conductive support layer is disposed between the first positive electrode conductive layer and the first negative electrode conductive layer.

Optionally, the first positive electrode conductive layer and the first negative electrode conductive layer are the same material.

Another object of the present invention is to provide a battery cell having a high overcurrent capability, so as to satisfy the use requirements of higher power devices.

To achieve the purpose, the invention adopts the following technical scheme:

The utility model provides a battery monomer, includes casing and foretell electrode assembly, first through-hole and second through-hole have been seted up respectively at the both ends that are relative on the casing, electrode assembly sets up in the casing, the positive pole post follow first through-hole wears out and with casing fixed connection, the negative pole post follow the second through-hole wears out and with casing fixed connection.

Optionally, the positive electrode post and the hole wall of the first through hole and the negative electrode post and the hole wall of the second through hole are all connected through insulating sealant.

It is a further object of the present invention to provide a battery having a high overcurrent capability, so as to be able to meet the use requirements of higher power devices.

To achieve the purpose, the invention adopts the following technical scheme:

A battery comprises the single battery.

It is a further object of the present invention to provide a powered device that has a high power and is stable in operation.

To achieve the purpose, the invention adopts the following technical scheme:

an electric device comprises the single battery or the battery.

The beneficial effects are that:

The current path of the electrode assembly provided by the invention is: current collector-post. The electrode assembly eliminates the arrangement of the tabs in the prior art, so that the actual area of each bipolar current collector is the overcurrent area of the current collector. Therefore, the overcurrent capacity can be increased by increasing the area of the bipolar current collector; the area of the anode and cathode polar posts can be set according to the area of the bipolar current collector, and the current transmitted from the bipolar current collector to the polar posts is not limited by the polar posts, so that the overcurrent area in the whole current path is ensured to be very large; in addition, electrons are transferred between the positive electrode conductive layer and the negative electrode conductive layer, current sequentially passes through each bipolar current collector, and the transfer path is very short, so that the bipolar current collector has good conductive performance.

The battery unit provided by the invention adopts the electrode assembly, and the positive electrode post and the negative electrode post respectively pass through the first through hole and the second through hole on the shell, so that the battery unit is electrically connected with external equipment, and can transmit larger current due to the larger overcurrent area of the electrode assembly, and can be applied to high-power equipment.

The battery provided by the invention comprises the single battery, and has higher overcurrent capacity, so that the use requirement of higher power equipment can be met.

The electric equipment provided by the invention comprises the single battery or the battery. The electric equipment has higher power and stable operation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.

Fig. 1 is a schematic view of a structure of an electrode assembly provided by the present invention;

FIG. 2 is a schematic diagram of a bipolar pole piece according to the present invention;

FIG. 3 is a schematic diagram II of a bipolar pole piece provided by the invention;

FIG. 4 is a schematic diagram of the orthographic projection area relationship between a positive electrode post and a second positive electrode conductive layer provided by the invention;

FIG. 5 is a schematic diagram showing the relationship between the projected areas of the anode post and the second anode conductive layer;

FIG. 6 is a schematic view of the thickness relationship between a positive electrode post and a second positive electrode conductive layer provided by the present invention;

Fig. 7 is a schematic diagram of the relationship between the thickness of the negative electrode post and the second negative electrode conductive layer provided by the invention.

In the figure:

100. Bipolar pole pieces; 101. a conductive support layer; 110. bipolar current collector; 111. a first positive electrode conductive layer; 112. a first negative electrode conductive layer; 120. a first positive electrode material layer; 130. a first negative electrode material layer; 200. a positive electrode assembly; 210. a second positive electrode conductive layer; 220. a positive electrode post; 230. a second positive electrode material layer; 300. a negative electrode assembly; 310. a second negative electrode conductive layer; 320. a negative electrode post; 330. a second negative electrode material layer; 400. a diaphragm; 500. and (5) heat sealing glue.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first location" and "second location" are two distinct locations and wherein the first feature is "above," "over" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is level above the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

Referring to fig. 1 and 2, the present embodiment provides an electrode assembly including a plurality of bipolar electrode sheets 100, a positive electrode assembly 200, and a negative electrode assembly 300. The bipolar electrode plate 100 includes a bipolar current collector 110, a first positive electrode material layer 120 and a first negative electrode material layer 130, the bipolar current collector 110 includes a first positive electrode conductive layer 111 and a first negative electrode conductive layer 112, the first positive electrode material layer 120 is disposed on a side of the first positive electrode conductive layer 111 away from the first negative electrode conductive layer 112, the first negative electrode material layer 130 is disposed on a side of the first negative electrode conductive layer 112 away from the first negative electrode conductive layer 112, a plurality of bipolar electrode plates 100 are stacked to form a electrode plate group, and opposite sides of two adjacent bipolar electrode plates 100 are disposed oppositely. The positive electrode assembly 200 includes a second positive electrode conductive layer 210, one side of the second positive electrode conductive layer 210 is provided with a positive electrode post 220, the other side is provided with a second positive electrode material layer 230, and the second positive electrode material layer 230 is opposite to the negative electrode of the pole piece group. The negative electrode assembly 300 includes a second negative electrode conductive layer 310, one side of the second negative electrode conductive layer 310 is provided with a negative electrode post 320, the other side is provided with a second negative electrode material layer 330, and the second negative electrode material layer 330 is opposite to the positive electrode of the pole piece group.

The current path of the electrode assembly provided in this embodiment is: current collector-post. The electrode assembly eliminates the prior art tab arrangement, so the actual area of each bipolar current collector 110 is the current collector's overcurrent area. Accordingly, the overcurrent capability may be increased by increasing the area of the bipolar current collector 110; the area of the positive and negative electrode posts 320 can be set according to the area of the bipolar current collector 110, and the current transmitted from the bipolar current collector 110 to the posts is not limited by the posts, so that the overcurrent area in the whole current path is ensured to be very large; in addition, electrons are transferred between the positive and negative conductive layers, and current sequentially passes through each bipolar current collector 110, so that the transfer path is very short, and good conductivity is achieved.

Alternatively, referring to fig. 3, a conductive support layer 101 is provided between the first positive electrode conductive layer 111 and the first negative electrode conductive layer 112. The conductive support layer 101 plays a role of conducting and supporting, and the first positive electrode conductive layer 111 and the first negative electrode conductive layer 112 may be formed on both sides of the conductive support layer 101 by electroplating or sputtering.

Alternatively, the materials of the first positive electrode conductive layer 111 and the first negative electrode conductive layer 112 may be the same or different.

Illustratively, in the case of a sodium ion battery, the materials of the first positive electrode conductive layer 111 and the first negative electrode conductive layer 112 may be the same, for example, aluminum; in the case of a lithium ion battery, the materials of the first positive electrode conductive layer 111 and the first negative electrode conductive layer 112 may be different, for example, the first positive electrode conductive layer 111 is aluminum and the first negative electrode conductive layer 112 is copper.

In one embodiment, bipolar current collector 110 has a thickness of 8 μm, and optionally, first positive electrode conductive layer 111 and first negative electrode conductive layer 112 are each 21cm by 21cm in size. The first positive electrode material layer 120 is coated on the first positive electrode conductive layer 111 by an oily binder, and the first negative electrode material layer 130 is coated on the first positive electrode conductive layer 111 by an aqueous binder. The first positive electrode material layer 120 adopts NCM613, and the size of a coating area is 20cm x 20cm; the first negative electrode material layer 130 is made of graphite material, and the size of the coating area is 20.5cm by 20.5cm.

In other embodiments, the first positive electrode material layer 120 may be made of ternary material, lithium iron phosphate, or the like, and the first negative electrode material layer 130 may be made of lithium titanate, lithium metal, or the like. The dimensions of the first positive electrode conductive layer 111, the first negative electrode conductive layer 112, the first positive electrode material layer 120, and the first negative electrode material layer 130 are set according to specific use requirements, and are not particularly limited herein. The materials and dimensions of the second positive electrode conductive layer 210, the second negative electrode conductive layer 310, the second positive electrode material layer 230, and the second negative electrode material layer 330 may be set according to the materials and dimensions of the first positive electrode conductive layer 111, the first negative electrode conductive layer 112, the first positive electrode material layer 120, and the first negative electrode material layer 130, respectively.

Further, referring to fig. 4 and 5, the positive electrode post 220 and the second positive electrode conductive layer 210 are integrally formed; and/or, the anode post 320 and the second anode conductive layer 310 are integrally formed.

Illustratively, in preparing the positive electrode assembly 200, the outermost side is a stepped structure, the portion with a larger cross-sectional area serves as the second positive electrode conductive layer 210, the protruding portion serves as the positive electrode post 220, and the positive electrode post 220 is disposed toward the side facing away from the pole piece group; similarly, in the preparation of the anode assembly 300, the outermost side is of a stepped structure, the portion with a larger cross-sectional area serves as the second anode conductive layer 310, the protruding portion serves as the anode post 320, and the anode post 320 is disposed toward the side facing away from the pole piece group.

Further, referring to fig. 6 and 7, in the thickness direction of the pole piece group, the relationship between the orthographic projection area S1 of the positive electrode post 220 and the orthographic projection area S2 of the second positive electrode conductive layer 210 is satisfied: 0.01< S1/S2<0.8 (illustratively, S1/S2 may be 0.01, 0.3, 0.5, or 0.8, etc.); and/or, along the thickness direction of the pole piece group, the relationship between the orthographic projection area S3 of the negative pole 320 and the orthographic projection area S4 of the second negative conductive layer 310 is satisfied: 0.01< S3/S4<0.8 (illustratively, S3/S4 may be 0.01, 0.3, 0.5, or 0.8, etc.). The thickness direction of the pole piece group refers to the stacking direction (i.e., grouping direction) of the plurality of bipolar pole pieces 100. Preferably, the positive electrode post 220 is disposed coaxially with the second positive electrode conductive layer 210, and the negative electrode post 320 is disposed coaxially with the second negative electrode conductive layer 310, the coaxial arrangement being advantageous for manufacturing and subsequent installation and mating with other external circuitry.

It can be appreciated that too large a pole orthographic projection area ratio can affect the packaging of the aluminum plastic film, and too small a pole orthographic projection area ratio can affect the overcurrent capacity of the battery. In the actual production process, the size of the anode and cathode columns can be adjusted according to the overcurrent requirement.

Further, the relationship between the thickness T1 of the positive electrode post 220 and the thickness T2 of the second positive electrode conductive layer 210 is satisfied: 0.05< T1/T2<0.4 (illustratively, T1/T2 may be 0.05, 0.1, 0.25, or 0.4, etc.); and/or, the thickness T3 of the anode post 320 and the thickness T4 of the second anode conductive layer 310 satisfy the relationship: 0.05< T3/T4<0.4 (illustratively, T1/T2 may be 0.05, 0.1, 0.25, or 0.4, etc.).

It will be appreciated that too small a post thickness ratio can easily result in deformation of the post and bipolar current collector 110, while too large a ratio can affect the space utilization of the module when assembled into a group.

Further, referring to fig. 2, a separator 400 is disposed between adjacent bipolar pole pieces 100, between positive electrode assembly 200 and the pole piece set, and between negative electrode assembly 300 and the pole piece set. Alternatively, the membrane 400 may employ a 12 μm base film plus a 3 μm ceramic PE film. Liquid injection spaces are respectively arranged between the adjacent bipolar pole pieces 100, between the positive pole component 200 and the pole piece group and between the negative pole component 300 and the pole piece group, and are used for storing electrolyte, and the adjacent two liquid injection spaces are sealed and isolated. The electrolyte may be a liquid electrolyte or a solid electrolyte, and when a solid electrolyte is used, the provision of the separator 400 may be omitted. The adjacent bipolar pole pieces 100, the anode assembly 200 and the pole piece group, and the cathode assembly 300 and the pole piece group are all connected by bonding through heat seal glue 500, so that the liquid injection space is sealed. Alternatively, the heat sealing condition is 180℃for 3s.

The electrode assembly provided in this embodiment is assembled as follows:

Step 1: the first positive electrode conductive layer 111 and the first negative electrode conductive layer 112 are pressed to form the bipolar current collector 110, the first positive electrode material layer 120 is formed by coating a positive electrode material on the outer side of the first positive electrode conductive layer 111, and the first negative electrode material layer 130 is formed by coating a negative electrode material on the outer side of the first negative electrode conductive layer 112.

Step 2: the plurality of bipolar plates 100 and the plurality of separators 400 are alternately arranged in sequence such that the first positive electrode material layer 120 and the first negative electrode material layer 130 in the adjacent two bipolar plates 100 are opposite to each other. The positive electrode assembly 200 and the negative electrode assembly 300 are respectively placed on both sides of the pole piece group, so that the second positive electrode material layer 230 is opposite to the negative electrode of the pole piece group, and the second negative electrode material layer 330 is opposite to the negative electrode of the pole piece group.

Step 3: the heat sealing compound 500 is coated on the region of the second positive electrode conductive layer 210 where the second positive electrode material layer 230 is not disposed, the region of the second negative electrode conductive layer 310 where the second negative electrode material layer 330 is not disposed, and the region of the bipolar current collector 110 where the first positive electrode material layer 120 and the first negative electrode material layer 130 are not disposed. When the heat seal glue 500 is applied, a liquid injection port is reserved.

Step 4: and (5) injecting liquid, and sealing the liquid injection port by using the heat sealing glue 500 after liquid injection.

The embodiment also provides a battery monomer, including casing and foretell electrode assembly, first through-hole and second through-hole have been seted up respectively at the both ends that are relative on the casing, and electrode assembly sets up in the casing, and positive pole post 220 wears out and with casing fixed connection from first through-hole, and negative pole post 320 wears out and with casing fixed connection from the second through-hole.

In this embodiment, the housing is made of an aluminum plastic film, the thickness of the aluminum plastic film is 0.1mm, the area of the aluminum plastic film is 25cm, and the sizes of the first through hole and the second through hole are 4.3cm and 4.3cm. At the time of assembly, the positive electrode tab 220 and the negative electrode tab 320 are respectively penetrated through the first through hole and the second through hole so as to be electrically connected with external devices. Since the electrode assembly has a large overcurrent area, the battery cell can transmit a large current, and can be applied to high-power devices.

Further, the positive electrode post 220 and the hole wall of the first through hole, and the negative electrode post 320 and the hole wall of the second through hole are all connected through insulating sealant.

The embodiment also provides a battery, which comprises the battery cell. The battery has higher overcurrent capacity, so that the use requirement of higher power equipment can be met.

The embodiment also provides electric equipment, which comprises the battery monomer or the battery. The electric equipment has higher power and stable operation.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. An electrode assembly, comprising:

The bipolar current collector (110) comprises a first positive electrode conductive layer (111) and a first negative electrode conductive layer (112), the first positive electrode conductive layer (120) is arranged on one side, far away from the first negative electrode conductive layer (112), of the first positive electrode conductive layer (111), the first negative electrode material layer (130) is arranged on one side, far away from the first positive electrode conductive layer (111), of the first negative electrode conductive layer (112), a plurality of bipolar electrode plates (100) are stacked to form a electrode plate group, and one side, opposite to the other side, of each two adjacent bipolar electrode plates (100) is arranged oppositely;

The positive electrode assembly (200) comprises a second positive electrode conductive layer (210), one side of the second positive electrode conductive layer (210) is provided with a positive electrode post (220), the other side of the second positive electrode conductive layer is provided with a second positive electrode material layer (230), and the second positive electrode material layer (230) and the negative electrode of the pole piece group are oppositely arranged;

The negative electrode assembly (300) comprises a second negative electrode conductive layer (310), wherein a negative electrode pole (320) is arranged on one side of the second negative electrode conductive layer (310), a second negative electrode material layer (330) is arranged on the other side of the second negative electrode conductive layer, and the second negative electrode material layer (330) and the positive electrode of the pole piece group are oppositely arranged.

2. The electrode assembly of claim 1, wherein the positive electrode post (220) and the second positive electrode conductive layer (210) are integrally formed; and/or, the negative electrode post (320) and the second negative electrode conductive layer (310) are integrally formed.

3. The electrode assembly of claim 1, wherein the electrode assembly comprises,

Along the thickness direction of the pole piece group, the forward projection area S1 of the positive pole post (220) and the forward projection area S2 of the second positive conductive layer (210) satisfy the following relation: 0.01< S1/S2<0.8; and/or the number of the groups of groups,

Along the thickness direction of the pole piece group, the forward projection area S3 of the negative pole (320) and the forward projection area S4 of the second negative pole conductive layer (310) satisfy the following relation: 0.01< S3/S4<0.8.

4. The electrode assembly of claim 1, wherein the electrode assembly comprises,

The thickness T1 of the positive electrode post (220) and the thickness T2 of the second positive electrode conductive layer (210) satisfy the relationship: 0.05< T1/T2<0.4; and/or the number of the groups of groups,

The thickness T3 of the negative electrode post (320) and the thickness T4 of the second negative electrode conductive layer (310) satisfy the relationship: 0.05< T3/T4<0.4.

5. The electrode assembly according to any one of claims 1 to 4, wherein a conductive support layer is provided between the first positive electrode conductive layer (111) and the first negative electrode conductive layer (112).

6. The electrode assembly according to any one of claims 1 to 4, wherein the first positive electrode conductive layer (111) and the first negative electrode conductive layer (112) are the same material.

7. A battery cell, comprising a housing and the electrode assembly according to any one of claims 1-6, wherein a first through hole and a second through hole are respectively formed in two opposite ends of the housing, the electrode assembly is disposed in the housing, the positive electrode post (220) penetrates out of the first through hole and is fixedly connected with the housing, and the negative electrode post (320) penetrates out of the second through hole and is fixedly connected with the housing.

8. The battery cell of claim 7, wherein the positive electrode post (220) and the hole wall of the first through hole, and the negative electrode post (320) and the hole wall of the second through hole are all connected by insulating sealant.

9. A battery comprising the single cell according to any one of claims 7 or 8.

10. A powered device comprising a single cell as claimed in any one of claims 7 or 8 or comprising a battery as claimed in claim 9.