CN218997028U - Battery cover plate assembly and square battery - Google Patents
Battery cover plate assembly and square battery Download PDFInfo
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- CN218997028U CN218997028U CN202222899839.6U CN202222899839U CN218997028U CN 218997028 U CN218997028 U CN 218997028U CN 202222899839 U CN202222899839 U CN 202222899839U CN 218997028 U CN218997028 U CN 218997028U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a battery cover plate assembly and a square battery, wherein the battery cover plate assembly comprises a cover plate body, the inner surface of the cover plate body, which is close to a battery core, is provided with a negative electrode connecting sheet insulated from the cover plate body, and the negative electrode connecting sheet is connected with the inner surface of the cover plate body through an external short circuit structure; the external short circuit structure comprises a conductive elastic piece arranged on the negative electrode connecting piece, and a conductive connecting rod arranged on the conductive elastic piece, wherein the conductive connecting rod is subjected to elastic force to enable the other end of the conductive connecting rod to be abutted on an insulating polymer layer on the inner surface of the cover plate body. After the insulating polymer layer is melted, the conductive connecting rod moves until contacting with the inner surface of the cover plate body under the action of elasticity to form electric connection, so that an external short circuit is formed, the thermal runaway speed of the battery is further slowed down, and the safety of the battery is improved; the external short circuit structure is simple, the cost is low, the external short circuit structure is arranged in the internal space of the battery, the volume is small, and the appearance and the actual use of the battery are not affected.
Description
Technical Field
The utility model belongs to the technical field of secondary batteries, and relates to a battery cover plate assembly and a square battery.
Background
Secondary batteries, particularly lithium ion batteries, are widely used in the fields of consumer electronics, new energy automobiles, energy storage and the like due to the advantages of high energy density, long cycle life and the like. With the popularization of new energy products, the safety performance of the battery is widely concerned, and in the use or test process of the battery, the battery is possibly short-circuited due to the impact of external force or penetration of foreign matters, so that safety accidents such as fire explosion and the like are caused, and in order to ensure personal safety, the time of accident occurrence is delayed as far as possible, and enough separation time is provided for personnel; accordingly, there is a need for related aspects of battery design and improvement to improve safety for its use in the above-described scenario, which is an important and urgent issue of current interest in the industry.
CN108598355a discloses a secondary battery connecting piece, which comprises a pole connecting section, a pole lug connecting section, an external short circuit connecting section, a first bending section, a second bending section and an overcurrent fusing protecting part; the overcurrent fusing protection part is in a structure of a fuse hole, a fuse cavity, a fusible strip or a fusible piece. When the battery is short-circuited, the whole circuit instantaneously generates a large current, so that the high-temperature fusing firstly occurs at the moment, and the circuit is protected.
CN212412135U discloses a battery cover plate assembly and a single battery, wherein the battery cover plate assembly comprises an MIT-PTC composite safety assembly, which is connected in series between the upper surface of the conductive plate and the negative terminal; the MIT-PTC composite safety assembly comprises an MIT component and a PTC component which are connected in series, wherein the MIT component is used for being suddenly changed into a conductor by an insulator at a first temperature to conduct a negative electrode terminal and a conductive plate, so that the battery forms an external short circuit; the PTC component is for resistance surge at a second temperature to limit short circuit current; the second temperature is greater than the first temperature. When the temperature rises to the first temperature, the MIT component conducts the negative electrode terminal and the conductive plate, so that the battery forms an external short circuit, and the electric energy in the battery 10 can be timely released; when the temperature is further increased to the second temperature, the resistance of the PTC component is suddenly increased, so that the short-circuit current can be limited, so that the battery is always in a safe state, and thermal runaway of the battery is prevented.
CN103151489a discloses a hard shell power battery, which is provided with a battery cell protection frame, comprising a support plate and non-conductive brackets arranged on two sides of the support plate, wherein a bare battery cell is accommodated in an accommodating area surrounded by the support plate and the brackets of the battery cell protection frame, the bare battery cell and the battery cell protection frame are arranged in a conductive shell together, the main body of the support plate is made of conductive materials, and the conductive materials of the support plate are electrically connected with one electrode lug of the bare battery cell; the conductive shell is electrically connected with the other electrode lug of the bare cell; the support is provided with a through groove at the corner connected with the support plate, and when the conductive shell is deformed, the support is contacted with the conductive material at the through groove to cause the short circuit of the battery. According to the utility model, a mechanical device is not additionally arranged in the power battery, but the through groove is formed in the support, so that when the power battery is pressed to deform the shell, the shell contacts with the conductive material at the through groove to realize external short circuit of the power battery, the energy of the battery core is released, the self voltage is reduced, and the safety of the power battery when the power battery is pressed is greatly improved.
The scheme can effectively improve the safety of the battery, but is not beneficial to large-scale production and application because of complex and high cost of devices such as a multi-area and fusing protection structural design of the connecting sheet, an MIT-PTC component sensitive to increased temperature or an additionally arranged protective frame; therefore, a new simple and easy technical scheme is needed, and the battery safety is improved effectively, and meanwhile, the cost is reduced, and the method is suitable for large-scale production and application.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide a battery cover plate assembly and a square battery, wherein the battery cover plate assembly comprises a cover plate body, one side of the cover plate body, which is close to the inner surface of a battery core, is provided with a negative electrode connecting sheet insulated from the cover plate body, and the negative electrode connecting sheet is connected with the inner surface of the cover plate body through an external short circuit structure; the external short circuit structure comprises a conductive elastic piece arranged on the negative electrode connecting piece, and a conductive connecting rod arranged on the conductive elastic piece, wherein the conductive connecting rod is subjected to elastic force to enable the other end of the conductive connecting rod to be abutted on an insulating polymer layer on the inner surface of the cover plate body. After the insulating polymer layer melts, the conductive connecting rod moves until contacting with the inner surface of the cover plate body through the action of elasticity, and electric connection is formed, so that an external short circuit is formed, the speed of thermal runaway of the battery is further slowed down, the safety of the battery is improved, the battery cover plate assembly is low in cost, simple in structure and suitable for large-scale battery production and application.
To achieve the purpose, the utility model adopts the following technical scheme:
in a first aspect, the utility model provides a battery cover plate assembly, which comprises a cover plate body, wherein a negative electrode connecting sheet insulated from the cover plate body is arranged on one side of the cover plate body, which is close to the inner surface of a battery core, and the negative electrode connecting sheet is connected with the inner surface of the cover plate body through at least one external short circuit structure;
the external short circuit structure comprises a conductive elastic piece, wherein one end of the conductive elastic piece is arranged on the negative electrode connecting piece, a conductive connecting rod is arranged at the other end of the conductive elastic piece, and the conductive elastic piece continuously exerts an elastic action on the conductive connecting rod, so that the other end of the conductive connecting rod is abutted against an insulating polymer layer arranged on the inner surface of the cover plate body to form the external short circuit structure;
after the insulating polymer layer is melted, the conductive connecting rod moves under the action of elasticity until contacting with the inner surface of the cover plate body to form electric connection, so that an external short circuit is formed.
The utility model aims to provide the battery with the battery cover plate assembly, which is characterized in that an external short circuit structure with a switching function is additionally arranged between the cover plate body and the negative electrode connecting sheet, so that the external short circuit structure can be triggered when the battery with the battery cover plate assembly is in thermal runaway caused by internal short circuit, the negative electrode connecting sheet is electrically communicated with the cover plate body, the cover plate body is electrically connected with the positive electrode (a positive potential is applied to the cover plate body to prevent electrochemical corrosion), and the negative electrode connecting sheet is used for connecting the negative electrode lug of the battery core, so that direct conduction between the positive electrode and the negative electrode of the battery can be formed, and the battery is further subjected to external short circuit.
Specifically, the external short circuit structure realizes the function of switch through setting up high temperature melting's insulating polymer layer, conductive elastic component on the negative pole connection piece makes conductive connecting rod conflict and fix (insulating polymer layer itself has cohesiveness) in insulating polymer layer's surface through continuously exerting elasticity, when the battery internal short circuit causes the temperature to rise violently, insulating polymer layer takes place to melt and becomes the fluid, because it is attached to the internal surface of apron main part, on the one hand, insulating polymer layer is after melting, constantly weakening because of the mobility and holding power, drip gradually by self gravity, and under conductive elastic force's effect of conductive connecting rod has accelerated insulating polymer layer's attenuate speed, conductive connecting rod can be constantly moved to the internal surface of battery apron and realize electric switch-on until direct contact, cause external short circuit, when the battery internal short circuit accident changes external short circuit, the battery temperature intensifies too soon, the speed of thermal runaway has been effectively slowed down in the time, namely, the utility model has effectively improved the safety performance of battery assembly containing battery through setting up simple structure between the internal surface of battery apron and negative pole connection piece, low cost's outer structure can effectively improve the battery.
It should be emphasized that the external short circuit structure in the battery cover plate assembly is positioned in the internal space formed by the battery cover plate and the shell and is not exposed to the outer surface of the battery, so that the actual use of the battery is not affected; the dimensions of the individual components in the outer short-circuit structure should be reduced as much as possible in order to be arranged in the interior space.
The following is a preferred embodiment of the present utility model, but is not a limitation of the embodiment provided by the present utility model. The technical aim and the beneficial effects of the utility model can be better achieved and realized through the following technical scheme.
As a preferable technical scheme of the utility model, the conductive elastic piece is a metal spring.
In the preferred technical scheme of the utility model, in the external short circuit structure, when the insulating polymer layer is not melted, the metal spring is in a compressed state.
As a preferable technical scheme of the utility model, the negative electrode connecting piece comprises a first connecting area and a second connecting area, the first connecting area is arranged on the inner surface of the cover plate body, one end of the first connecting area, which is close to the edge of the cover plate body, is vertically connected with the second connecting area, and the second connecting area extends in a direction away from the cover plate body.
In the preferred technical scheme of the utility model, in the external short circuit structure, the conductive elastic member is vertically arranged on the second connection region, the conductive connecting rod comprises a first region rod body and a second region rod body, the first region rod body is coaxial with the conductive elastic member and is connected with one end of the conductive elastic member, one end of the second region rod body is vertically connected with the first region rod body, and the other end of the second region rod body is parallel to the second connection region and extends towards a direction close to the insulating polymer layer until contacting with the insulating polymer layer.
As a preferable technical scheme of the utility model, the conductive elastic piece is connected with the conductive connecting rod through a conductive supporting plate, one surface of the conductive supporting plate is arranged at one end of the conductive elastic piece far away from the negative electrode post, and one end of the conductive connecting rod is connected with the other surface of the conductive supporting plate.
The conductive support plate is used for collecting the elastic force of the conductive elastic piece and enabling the elastic force to be transferred to the conductive connecting rod more uniformly. Particularly when the conductive elastic piece is a metal spring, the conductive supporting plate can also be reinforced and is convenient to fix between the conductive connecting rod and the metal spring.
It can be understood that when the temperature rise speed of the battery is high and the high polymer material melts, the conductive connecting rod is electrically connected with the cover plate under the action of the melted high polymer material layer and the conductive elastic piece.
In a preferred embodiment of the present utility model, the insulating polymer layer is converted into a fluid at 130 to 170℃and/or 130 to 170℃such as 130℃135℃140℃145℃150℃155℃160℃165℃170℃170℃or the like, but the present utility model is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned ranges are equally applicable.
In a preferred embodiment of the present utility model, the thickness of the insulating polymer layer is 1.6 to 3mm, for example, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm or 3mm, etc., but the present utility model is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned numerical ranges are equally applicable.
The insulating polymer layers can be reasonably selected according to the use scene of the battery, and the insulating polymer layers with different melting point temperatures are selected to control the threshold value of the switch action of the external short circuit structure.
The insulating polymer layer is not too thin due to the continuous elastic force conducted by the conductive connecting rod, so that the insulating polymer layer is prevented from being directly pierced by the conductive connecting rod to cause external short circuit, but is not too thick, the cost is saved, the too slow melting speed caused by the too thick melting speed is avoided, the time course of forming the external short circuit is delayed, and the optimal time is delayed.
The insulating polymer layer has cohesiveness and can realize firm adhesion of the conductive connecting rod, and the insulating polymer layer can be a composite layer formed by superposing any one or at least two materials of a polyvinylidene fluoride layer, a polytetrafluoroethylene layer, a polypropylene layer, a polyethylene layer, a polyvinyl chloride layer, an ABS resin layer, a methacrylic resin layer, a polyamide layer, a polyester layer, a polyacetal layer, an SBR layer, an acrylic butadiene rubber layer or a polybutadiene rubber layer.
In a second aspect, the present utility model provides a prismatic battery, where the prismatic battery includes a casing, the battery cover assembly of the first aspect is disposed at an opening of the casing, an electrical core electrically connected to the battery cover assembly is disposed in an internal space formed by the casing and the battery cover assembly, and the external short circuit structure in the battery cover assembly is located in the internal space formed by the casing and the battery cover assembly.
As a preferable technical scheme of the utility model, the square battery is a square aluminum shell battery.
Compared with the prior art, the utility model has the beneficial effects that:
according to the utility model, the external short circuit structure with a switching function is additionally arranged between the inner surface of the battery cover plate and the negative electrode connecting sheet, so that when the battery with the battery cover plate assembly is in thermal runaway caused by internal short circuit, the insulating polymer layer in the external short circuit structure is continuously melted and thinned, and finally the direct contact between the negative electrode connecting sheet and the inner surface of the cover plate main body is caused, so that the positive electrode and the negative electrode of the battery are communicated, the external short circuit of the battery is caused, the excessive high temperature rise of the battery is effectively avoided, and the thermal runaway speed is effectively slowed down; the external short circuit structure in the battery cover plate assembly is simple and low in cost, and is arranged in the internal space of the battery, so that the volume is small, and the appearance and the actual use of the battery are not affected.
Drawings
Fig. 1 is a schematic structural view of a battery cover assembly according to embodiment 1 of the present utility model;
FIG. 2 is an enlarged view of the portion of the dashed box in FIG. 1;
the novel lithium ion battery comprises a 1-cover plate main body, a 2-negative electrode connecting piece, a first connecting area of a 21-negative electrode connecting piece, a second connecting area of a 22-negative electrode connecting piece, a 3-conductive elastic piece, a 4-conductive supporting plate, a 5-conductive connecting rod and a 6-insulating polymer layer.
Detailed Description
In order to make the technical solution, objects and advantages of the present utility model more apparent, the present utility model will be described in further detail by means of specific examples of embodiments with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.
In the description of the present utility model, 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 utility model 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, 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. For the electrical and communication fields, either a wired connection or a wireless connection is possible. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.
Example 1
The embodiment provides a battery cover plate assembly and contain square aluminum shell battery of battery cover plate assembly, square aluminum shell battery includes the shell the opening part of shell sets up battery cover plate assembly, the shell with be provided with in the inner space that battery cover plate assembly constitutes with battery cover plate assembly electric connection's electric core, battery cover plate assembly's schematic diagram is as shown in fig. 1 and fig. 2, can see from the figure:
the battery cover plate assembly comprises a cover plate body 1, wherein a negative electrode connecting sheet 2 insulated from the cover plate body 1 is arranged on one side, close to the inner surface of a battery core, of the cover plate body 1, the negative electrode connecting sheet 2 comprises a first connecting area 21 and a second connecting area 22, the first connecting area 21 is arranged on the inner surface of the cover plate body 1, one end, close to the short side edge of the cover plate body 1, of the first connecting area 21 is vertically connected with the second connecting area 22, and the second connecting area 22 extends in a direction away from the cover plate body 1;
the negative electrode connecting sheet 2 is connected with the inner surface of the cover plate body 1 through an external short circuit structure; the external short circuit structure comprises a conductive elastic piece 3 with one end arranged on a second connection area 22 in the negative electrode connection piece 2, and the conductive elastic piece 3 is a metal spring; a conductive supporting plate 4 is arranged on the conductive elastic piece 3, and a conductive connecting rod 5 is arranged on the other surface of the conductive supporting plate 4;
the conductive connecting rod 5 comprises a first area rod body and a second area rod body, the first area rod body is coaxial with the conductive elastic piece 3 and the conductive supporting plate 4 and is connected to one end of the conductive supporting plate 4, one end of the second area rod body is vertically connected with the first area rod body, and the other end of the second area rod body is parallel to the second connecting area 22 and extends to a direction close to the inner surface of the cover plate body 1 until contacting with an insulating polymer layer 6 arranged on the inner surface of the cover plate body 1; the conductive elastic piece 3 continuously applies elastic force to the conductive support plate 4 and the conductive connecting rod 5, so that one end of a second area rod body of the conductive connecting rod 5 is abutted against and fixed on the insulating polymer layer 6 to form the external short circuit structure;
the insulating polymer layer 6 is a polyethylene layer, the melting point is 110 ℃, and the thickness is 3mm;
the outer short circuit structure is positioned in an inner space formed by the shell and the battery cover plate component;
when the insulating polymer layer 6 is not melted, the conductive elastic member 3 is in a compressed state; when the insulating polymer layer 6 melts and drops and gradually thins, the conductive connecting rod 5 moves under the action of the received elastic force until contacting with the inner surface of the cover plate body 1 to form an electrical connection, thereby forming an external short circuit.
Example 2
The embodiment provides a battery cover plate assembly and a square aluminum shell battery comprising the battery cover plate assembly, wherein the square aluminum shell battery comprises a shell, the battery cover plate assembly is arranged at an opening of the shell, and a battery core electrically connected with the battery cover plate assembly is arranged in an inner space formed by the shell and the battery cover plate assembly;
the battery cover plate assembly comprises a cover plate body, wherein a negative electrode connecting sheet insulated from the cover plate body is arranged on one side, close to the inner surface of the battery core, of the cover plate body, the negative electrode connecting sheet comprises a first connecting area and a second connecting area, the first connecting area is arranged on the inner surface of the cover plate body, one end, close to the edge of a short side of the cover plate body, of the first connecting area is vertically connected with the second connecting area, and the second connecting area extends in a direction away from the cover plate body;
the negative electrode connecting sheet is connected with the inner surface of the cover plate body through at least one external short circuit structure;
the external short circuit structure comprises a conductive elastic piece, one end of which is arranged on the negative electrode connecting piece, and the conductive elastic piece is a metal spring; the other end of the conductive elastic piece is provided with a conductive connecting rod, the conductive connecting rod comprises a first area rod body and a second area rod body, the first area rod body is coaxial with the conductive elastic piece and is connected with one end of the conductive elastic piece, one end of the second area rod body is vertically connected with the first area rod body, and the other end of the second area rod body is parallel to the second connecting area and extends towards a direction close to the inner surface of the cover plate body until the second area rod body is contacted with an insulating polymer layer arranged on the inner surface of the cover plate body; the conductive elastic piece 3 continuously applies elastic force to the conductive connecting rod 5, so that one end of a rod body of a second area of the conductive connecting rod 5 is abutted against and fixed on the insulating polymer layer 6 to form the external short circuit structure;
the insulating polymer layer is a polypropylene layer, the melting point is 190 ℃, and the thickness is 1.6mm;
the outer short circuit structure is positioned in an inner space formed by the shell and the battery cover plate component;
when the insulating polymer layer is not melted, the conductive elastic piece is in a compressed state; when the insulating polymer layer is melted and dropped and gradually thinned, the conductive connecting rod moves under the action of the received elastic force until contacting with the inner surface of the cover plate body to form electric connection, so that an external short circuit is formed.
Comparative example 1
The comparative example provides a battery cover plate assembly and a square aluminum shell battery comprising the battery cover plate assembly, wherein the square aluminum shell battery comprises a shell, the battery cover plate assembly is arranged at an opening of the shell, and a battery core electrically connected with the battery cover plate assembly is arranged in an inner space formed by the shell and the battery cover plate assembly; the battery cover plate assembly comprises a cover plate body, and a negative electrode connecting sheet insulated from the cover plate body is arranged on one side of the cover plate body, which is close to the inner surface of the battery core; the battery cover assembly does not provide an external short circuit structure as described in embodiment 1 between the cover body and the negative electrode tab.
In a heating test, when the square aluminum shell batteries obtained in the embodiment 1 and the embodiment 2 reach respective set thermal runaway temperatures, the temperature rising rate of the battery is rapidly reduced due to the existence of an external short circuit structure, so that the safety performance of the battery is improved; in the soft package battery obtained in the comparative example 1, when the potential thermal runaway risk occurs in the battery, the temperature rise rate of the battery can be rapidly increased along with the occurrence of the thermal runaway, and the safety performance of the battery cannot meet the requirement. The battery cover plate is provided with the external short circuit structure with the switch function, and the external short circuit structure is arranged between the inner surface of the cover plate main body and the negative electrode connecting sheet.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that fall within the technical scope of the present utility model disclosed herein are within the scope of the present utility model.
Claims (10)
1. The battery cover plate assembly is characterized by comprising a cover plate body (1), wherein a negative electrode connecting sheet (2) insulated from the cover plate body (1) is arranged on one side, close to the inner surface of the battery core, of the cover plate body (1), and the negative electrode connecting sheet (2) is connected with the inner surface of the cover plate body (1) through at least one external short circuit structure;
the external short circuit structure comprises a conductive elastic piece (3) with one end arranged on the negative electrode connecting piece (2), a conductive connecting rod (5) is arranged at the other end of the conductive elastic piece (3), and the conductive elastic piece (3) continuously applies an elastic action to the conductive connecting rod (5) so that the other end of the conductive connecting rod (5) is abutted against an insulating polymer layer (6) arranged on the inner surface of the cover plate body (1) to form the external short circuit structure;
in the battery comprising a shell and the battery cover plate component, the external short circuit structure is positioned in an internal space formed by the shell and the battery cover plate component;
after the insulating polymer layer (6) is melted, the conductive connecting rod (5) moves under the action of elasticity until contacting with the inner surface of the cover plate body (1) to form electric connection, so as to form external short circuit.
2. The battery cover assembly according to claim 1, wherein the conductive elastic member (3) is a metal spring.
3. The battery cover assembly according to claim 2, wherein in the external short circuit structure, the metal spring is in a compressed state when the insulating polymer layer (6) is not melted.
4. The battery cover plate assembly according to claim 1, wherein the negative electrode connecting piece (2) comprises a first connecting region (21) and a second connecting region (22), the first connecting region (21) is disposed on the inner surface of the cover plate body (1), one end of the first connecting region (21) close to the short side edge of the cover plate body (1) is perpendicularly connected with the second connecting region (22), and the second connecting region (22) extends in a direction away from the cover plate body (1).
5. The battery cover plate assembly according to claim 4, wherein in the external short circuit structure, the conductive elastic member (3) is vertically disposed on the second connection region (22), the conductive connecting rod (5) includes a first region rod body and a second region rod body, the first region rod body is coaxial with the conductive elastic member (3) and is connected to one end of the conductive elastic member (3), one end of the second region rod body is vertically connected to the first region rod body, and the other end of the second region rod body is parallel to the second connection region (22) and extends in a direction approaching the insulating polymer layer (6) until contacting the insulating polymer layer (6).
6. The battery cover plate assembly according to any one of claims 1-4, wherein the conductive elastic member (3) and the conductive connecting rod (5) are connected through a conductive supporting plate (4), one surface of the conductive supporting plate (4) is arranged at one end of the conductive elastic member (3) away from the negative electrode connecting sheet (2), and one end of the conductive connecting rod (5) is connected to the other surface of the conductive supporting plate (4).
7. Battery cover plate assembly according to claim 1, characterized in that the insulating polymer layer (6) has a melting point of 130-170 ℃ and/or that the insulating polymer layer (6) is converted into a fluid at 130-170 ℃.
8. The battery cover plate assembly according to claim 1, wherein the thickness of the insulating polymer layer (6) is 1.6-3 mm.
9. A prismatic battery, characterized in that the prismatic battery comprises a housing, the battery cover plate assembly of any one of claims 1-8 is arranged at an opening of the housing, a cell electrically connected with the battery cover plate assembly is arranged in an inner space formed by the housing and the battery cover plate assembly, and the external short circuit structure in the battery cover plate assembly is positioned in the inner space formed by the housing and the battery cover plate assembly.
10. The prismatic battery according to claim 9, wherein the prismatic battery is a prismatic aluminum case battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222899839.6U CN218997028U (en) | 2022-11-01 | 2022-11-01 | Battery cover plate assembly and square battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222899839.6U CN218997028U (en) | 2022-11-01 | 2022-11-01 | Battery cover plate assembly and square battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218997028U true CN218997028U (en) | 2023-05-09 |
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ID=86223191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222899839.6U Active CN218997028U (en) | 2022-11-01 | 2022-11-01 | Battery cover plate assembly and square battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218997028U (en) |
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2022
- 2022-11-01 CN CN202222899839.6U patent/CN218997028U/en active Active
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