Battery cover plate and battery
By adding high-temperature-resistant stop blocks and mesh structures on the battery cover, the problem of the pole group blocking the explosion-proof valve when the battery is thermally out of control is solved, the safety performance and breathability of the battery are enhanced, and the risks of fire and explosion are avoided.
Patent Information
- Application Number
- CN202420010530.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-02
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-01-02
AI Technical Summary
When the battery gets out of control, the extreme set may block the explosion-proof valve due to the airflow rushing, causing the battery to fail to relieve pressure in time, increasing the risk of fire and explosion.
A battery cover plate is designed, including a light aluminum plate, an insulating plate and a stop. The stop plate is resistant to high temperature and electrolyte. When the insulating plate melts, it abuts between the light aluminum plate and the electrode group to form an exhaust passage. Avoid blocking the explosion-proof valve by the pole group, and a mesh structure is provided between the optical aluminum plate and the insulating plate to prevent the stop from being impacted by the airflow and provide a breathable passage.
It effectively prevents the pole group from blocking the explosion-proof valve under the airflow, alleviates the adverse consequences of the battery thermal runaway, enhances the safety performance of the battery, and prevents the explosion-proof valve from being completely blocked through the mesh structure to ensure that the gas can be discharged smoothly.
Smart Images
Figure CN222168539U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power batteries, and in particular to a battery cover and a battery. Background Art
[0002] At present, the insulation protection structure of the electrode group inside the battery cell is made of plastic materials such as PP, which can well protect the electrode group during the battery cell manufacturing process and normal use, and avoid abnormal connection and short circuit inside the battery cell. However, when the battery cell has thermal runaway, the internal temperature can reach above 600℃ in a short period of time, and the internal plastic materials such as the end plate will quickly melt and fail. At this time, there is only the electrode group inside the shell. Under the action of the internal high-temperature and high-pressure gas, the electrode group loses balance. Because the pressure at the explosion-proof valve of the cover plate is low, the electrode group can easily move toward the explosion-proof valve, thereby blocking the explosion-proof valve, causing the battery to fail to release pressure in time and catch fire and explode. Utility Model Content
[0003] In view of this, the utility model provides a battery cover and a battery to solve the existing problem that when thermal runaway occurs in the battery, the pole group may block the explosion-proof valve under the impact of airflow, aggravating the battery runaway and posing a greater safety risk.
[0004] In the first aspect, the utility model provides a battery cover plate, which is covered on the opening of the battery shell, and the battery shell is provided with a pole group inside. The battery cover plate includes a plain aluminum plate, an insulating plate and a stop block. The plain aluminum plate is provided with an explosion-proof valve; the insulating plate is attached to the inner side of the plain aluminum plate, and the insulating plate is provided with a receiving cavity; the stop block is provided in the receiving cavity, and the stop block is resistant to high temperature and electrolyte. The stop block is suitable for abutting between the plain aluminum plate and the pole group when the insulating plate melts due to thermal runaway of the battery, so that an exhaust channel connected to the explosion-proof valve is formed between the plain aluminum plate and the pole group. The battery cover plate also includes a mesh structure, which is provided between the plain aluminum plate and the insulating plate, and the mesh structure is located on the inner side of the explosion-proof valve.
[0005] In some embodiments, the battery cover further includes an end plate, which is located on the inner side of the insulating plate and is suitable for abutting against the electrode group.
[0006] In some embodiments, the insulating plate has a protrusion facing the end plate, and the interior of the protrusion is hollow to form a receiving cavity; the end plate has an avoidance groove, and the protrusion is embedded in the avoidance groove.
[0007] In some embodiments, the accommodating cavity penetrates the protruding portion along the width direction of the insulating plate, and the cross section of the stop block is the same as the cross section of the accommodating cavity.
[0008] In some embodiments, limiting ribs are provided on both sides of the inner wall of the accommodating cavity, and limiting grooves are provided on both sides of the stop block, and the limiting ribs are located in the limiting grooves.
[0009] In some embodiments, the stop block is fixed in the accommodating cavity by glue dispensing.
[0010] In some embodiments, a first drainage hole is opened on the bottom wall of the accommodating cavity along the thickness direction of the insulating plate, and a second drainage hole is opened on the bottom wall of the avoidance groove along the thickness direction of the end plate, and the first drainage hole and the second drainage hole are arranged opposite to each other.
[0011] In some embodiments, the insulating plate is provided with a groove body, the groove body has air holes along the thickness direction, and the mesh structure is placed inside the groove body.
[0012] In some embodiments, the width of the mesh structure is A, the width of the explosion-proof valve is B, and the width of the bare aluminum plate is C, then B≤A≤0.9C.
[0013] In a second aspect, the utility model further provides a battery, comprising a battery housing, an electrode group disposed inside the battery housing, and the battery cover in the first aspect, wherein the battery cover covers an opening of the battery housing.
[0014] Beneficial effects:
[0015] In the battery cover of the first aspect, a stopper is added between the bare aluminum plate and the insulating plate. When the battery thermal runaway causes the end plate to melt, the stopper abuts between the bare aluminum plate and the pole group, so that the bare aluminum plate and the pole group form an exhaust channel connected to the explosion-proof valve, preventing the pole group from blocking the explosion-proof valve under the impact of the airflow, alleviating the adverse consequences of the battery thermal runaway, and increasing the safety performance of the battery. In addition, the mesh structure in this scheme is used to prevent the stopper from being impacted out of the explosion-proof valve by the airflow, and the mesh structure is also conducive to ventilation and will not completely block the explosion-proof valve.
[0016] In addition, the battery of the second aspect comprises the battery cover of the first aspect, and thus the battery of the second aspect has all the beneficial effects of the battery cover of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0018] Figure 1 It is a first exploded isometric view of a battery cover according to an embodiment of the utility model;
[0019] Figure 2 A second exploded isometric view of a battery cover according to an embodiment of the utility model;
[0020] Figure 3This is an assembly diagram of a battery cover according to an embodiment of the utility model;
[0021] Figure 4 A schematic diagram of a structure of the mesh structure described in an embodiment of the utility model;
[0022] Figure 5 This is another structural schematic diagram of the mesh structure described in an embodiment of the utility model.
[0023] Description of reference numerals:
[0024] 100. Battery cover;
[0025] 110, bare aluminum plate; 120, insulating plate; 130, stopper; 140, end plate; 150, mesh structure;
[0026] 111. Explosion-proof valve; 112. Pole;
[0027] 121, accommodating cavity; 122, protruding portion; 123, first liquid discharge hole; 124, tank body; 125, vent; 126, limiting rib;
[0028] 131, limit slot;
[0029] 141. Avoidance groove; 142. Air vent; 143. Second liquid drain hole. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.
[0031] In order to deepen the understanding of the solution of the utility model, it is necessary to elaborate on the technical problems in detail in combination with relevant technologies. The specific contents are as follows:
[0032] At present, with the increasing maturity of lithium-ion battery technology, lithium-ion batteries have been widely used as power batteries in the field of electric vehicles. Therefore, people's requirements for the safety performance of lithium-ion batteries are increasing.
[0033] In the traditional lithium-ion battery structure, the cover plate and the shell are welded to encapsulate the electrode group inside the shell; the insulating plate of the cover plate plays the role of insulation and sealing. However, when the battery has thermal runaway, the internal temperature of the battery increases, and the gas generation increases, causing the explosion-proof valve to automatically open for exhaust; at this time, the insulating plate may melt at high temperature, and the electrode group may block the explosion-proof valve under the impact of airflow, aggravating the battery runaway and posing a greater safety risk.
[0034] Furthermore, the battery temperature is generally controlled by a special temperature control circuit. When the temperature control circuit fails, the battery may suffer thermal runaway, the chemical reaction inside the battery will intensify, and more gas will be generated. If the high temperature melts the end plate at this time and the pole group blocks the explosion-proof valve, the battery will be in danger of explosion.
[0035] In order to alleviate the above technical problems, the utility model provides a battery cover 100 and a battery. Figures 1 to 5 The embodiments of the present utility model are described in detail.
[0036] First, refer to Figure 1 and Figure 2 The utility model provides a battery cover 100, which is covered on the opening of the battery shell, and the battery shell is provided with a pole group inside. The battery cover 100 includes a bare aluminum plate 110, an insulating plate 120 and a stopper 130. The bare aluminum plate 110 is provided with an explosion-proof valve 111; the insulating plate 120 is attached to the inner side of the bare aluminum plate 110, and the insulating plate 120 is provided with a receiving cavity 121; the stopper 130 is arranged in the receiving cavity 121, and the stopper 130 is resistant to high temperature and electrolyte. The stopper 130 is suitable for abutting between the bare aluminum plate 110 and the pole group when the insulating plate 120 melts due to thermal runaway of the battery, so that an exhaust channel connected to the explosion-proof valve 111 is formed between the bare aluminum plate 110 and the pole group. The battery cover 100 also includes a mesh structure 150, which is arranged between the bare aluminum plate 110 and the insulating plate 120, and the mesh structure 150 is located on the inner side of the explosion-proof valve 111.
[0037] Specifically, a stopper 130 is added between the bare aluminum plate 110 and the insulating plate 120. When the end plate 140 melts due to thermal runaway of the battery, the stopper 130 abuts between the bare aluminum plate 110 and the pole group, so that an exhaust passage connected to the explosion-proof valve 111 is formed between the bare aluminum plate 110 and the pole group, preventing the pole group from blocking the explosion-proof valve 111 under the impact of the airflow, alleviating the adverse consequences of thermal runaway of the battery, and increasing the safety performance of the battery. In addition, the mesh structure 150 in this solution is used to prevent the stopper 130 from being impacted out of the explosion-proof valve 111 by the airflow, and the mesh structure 150 is also conducive to ventilation and will not completely block the explosion-proof valve 111.
[0038] More specifically, a pole 112 is provided on one side of the bare aluminum plate 110 , and an explosion-proof valve 111 is provided on the other side.
[0039] In particular, the stopper block 130 is preferably made of ceramic.
[0040] In some embodiments, reference Figures 1 to 3 The battery cover 100 further includes an end plate 140 , which is located on the inner side of the insulating plate 120 , and is suitable for abutting against the electrode group.
[0041] Specifically, the end plate 140 serves to limit the position of the electrode group, so that the electrode group is not easy to shake.
[0042] More specifically, when the battery thermal runaway causes the temperature to rise, the insulating plate 120 and the end plate 140 are both melted by the heat, and at this time, the stop block 130 abuts between the bare aluminum plate 110 and the electrode group.
[0043] In some embodiments, reference Figure 2 The insulating plate 120 has a protrusion 122 facing the end plate 140 , and the interior of the protrusion 122 is hollow to form a receiving cavity 121 ; the end plate 140 has an avoidance groove 141 , and the protrusion 122 is embedded in the avoidance groove 141 .
[0044] Specifically, this scheme is a specific setting method of the accommodating cavity 121. The accommodating cavity 121 is set inside the protrusion 122, the stop block 130 is set in the accommodating cavity 121, and the avoidance groove 141 accommodates the protrusion 122. The structure is compact, the space occupied is small, and the connection is firm.
[0045] In some embodiments, reference Figure 1 The accommodating cavity 121 penetrates the protruding portion 122 along the width direction of the insulating plate 120 , and the cross section of the stopping block 130 is the same as the cross section of the accommodating cavity 121 .
[0046] Specifically, this solution is an assembly structure of the accommodating cavity 121 and the stop block 130 , and the stop block 130 is inserted into the accommodating cavity 121 along the width direction of the insulating plate 120 , which is easy to operate and has a good limiting effect.
[0047] In some embodiments, reference Figure 1 , limiting ribs 126 are provided on the inner walls of both sides of the accommodating cavity 121 , limiting grooves 131 are provided on both sides of the stop block 130 , and the limiting ribs 126 are located in the limiting grooves 131 .
[0048] Specifically, this scheme is a further assembly structure of the accommodating cavity 121 and the stop block 130. The inner walls on both sides of the accommodating cavity 121 are provided with limiting ribs 126, and limiting grooves 131 are provided on both sides of the stop block 130. The limiting ribs 126 are located in the limiting grooves 131, so that the stop block 130 has only one degree of freedom along the width direction of the insulating plate 120, and the movement is guided, and the limiting effect is good.
[0049] In some embodiments, the stop block 130 is fixed in the accommodating cavity 121 by glue dispensing.
[0050] Specifically, the present solution is a further assembly structure of the accommodating cavity 121 and the stop block 130. The stop block 130 is fixed in the accommodating cavity 121 by glue dispensing. After the stop block 130 is inserted into the accommodating cavity 121, the only remaining degree of freedom of the stop block 130 is fixed by glue dispensing, so that the stop block 130 is not easy to fall off.
[0051] In some embodiments, reference Figure 2 A first drainage hole 123 is opened on the bottom wall of the accommodating cavity 121 along the thickness direction of the insulating plate 120, and a second drainage hole 143 is opened on the bottom wall of the avoidance groove 141 along the thickness direction of the end plate 140. The first drainage hole 123 and the second drainage hole 143 are arranged opposite to each other.
[0052] Specifically, in the present embodiment, a first drainage hole 123 is formed on the bottom wall of the accommodating cavity 121 along the thickness direction of the insulating plate 120, and a second drainage hole 143 is formed on the bottom wall of the avoidance groove 141 along the thickness direction of the end plate 140. The first drainage hole 123 and the second drainage hole 143 are arranged opposite to each other, so that electrolyte will not accumulate in the accommodating cavity 121, thereby facilitating the reflux of electrolyte.
[0053] More specifically, the first drainage hole 123 and the second drainage hole 143 are both in a cross shape.
[0054] In some embodiments, reference Figure 1 and Figure 2 The insulating plate 120 is provided with a groove body 124 , and a vent 125 is provided along the thickness direction of the groove body 124 . The mesh structure 150 is placed inside the groove body 124 .
[0055] More specifically, the mesh structure 150 is made of metal, welded to the lower surface of the bare aluminum plate 110 or stamped integrally with the bare aluminum plate 110 , and the thickness of the mesh structure 150 is 0.3 mm to 2 mm.
[0056] Furthermore, the end plate 140 is provided with a plurality of ventilation holes 142 at positions corresponding to the ventilation openings 125 .
[0057] In addition, refer to Figure 4 and Figure 5 The cross-sectional shape of the mesh structure 150 can be various, and can be composed of a single or multiple transverse ribs, longitudinal ribs, and oblique ribs, including but not limited to a "W" shape and an "X" shape.
[0058] In some embodiments, the width of the mesh structure 150 is A, the width of the explosion-proof valve 111 is B, and the width of the bare aluminum plate 110 is C, then B≤A≤0.9C.
[0059] Specifically, this solution provides a size relationship between the mesh structure 150 and the explosion-proof valve 111 , and has a reasonable structure, which prevents the mesh structure 150 from rushing out of the explosion-proof valve 111 .
[0060] Secondly, the utility model further provides a battery, including a battery housing, an electrode group arranged inside the battery housing, and a battery cover 100, wherein the battery cover 100 covers the opening of the battery housing.
[0061] Specifically, the battery in this solution includes a battery cover 100, so the battery has all the beneficial effects of the battery cover 100. In addition, the battery in this solution also includes other components such as a battery protection board, and only the components related to this solution are listed here, but it does not limit the composition of the battery.
[0062] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.
Claims
1. A battery cover plate, covering the opening of a battery housing, wherein a pole group is arranged inside the battery housing, It is characterized in that The battery cover comprises: A plain aluminum plate, wherein the plain aluminum plate is provided with an explosion-proof valve; An insulating plate, the insulating plate is attached to the inner side of the bare aluminum plate, and the insulating plate is provided with a receiving cavity; A stop block, the stop block is arranged in the accommodating cavity, the stop block is resistant to high temperature and electrolyte, and the stop block is suitable for abutting between the bare aluminum plate and the electrode group when the thermal runaway of the battery causes the insulating plate to melt, so that an exhaust channel connected to the explosion-proof valve is formed between the bare aluminum plate and the electrode group; The battery cover plate also includes a mesh structure, which is arranged between the bare aluminum plate and the insulating plate, and the mesh structure is located on the inner side of the explosion-proof valve.
2. The battery cover according to claim 1, It is characterized in that The battery cover plate further comprises an end plate, which is located on the inner side of the insulating plate and is suitable for abutting against the electrode group.
3. The battery cover according to claim 2, It is characterized in that The insulating plate has a protrusion facing the end plate, and the protrusion is hollow inside to form the accommodating cavity; The end plate has an avoidance groove, and the protrusion is embedded in the avoidance groove.
4. The battery cover according to claim 3, It is characterized in that The accommodating cavity penetrates the protruding portion along the width direction of the insulating plate, and the cross section of the stop block is the same as the cross section of the accommodating cavity.
5. The battery cover according to claim 4, It is characterized in that Limiting ribs are arranged on the inner walls of both sides of the accommodating cavity, and limiting grooves are arranged on both sides of the stop block, and the limiting ribs are located in the limiting grooves.
6. The battery cover according to claim 5, It is characterized in that The stop block is fixed in the accommodating cavity by glue dispensing.
7. The battery cover according to claim 3, It is characterized in that The bottom wall of the accommodating cavity is provided with a first drainage hole along the thickness direction of the insulating plate, and the bottom wall of the avoidance groove is provided with a second drainage hole along the thickness direction of the end plate. The first drainage hole and the second drainage hole are arranged opposite to each other.
8. The battery cover according to any one of claims 1 to 7, It is characterized in that The insulating plate is provided with a groove body, and a vent is provided in the groove body along the thickness direction, and the mesh structure is placed inside the groove body.
9. The battery cover according to claim 8, It is characterized in that The width of the mesh structure is A, the width of the explosion-proof valve is B, and the width of the plain aluminum plate is C, then B≤A≤0.9C.
10. A battery, It is characterized in that The invention comprises a battery housing, a pole group arranged inside the battery housing, and a battery cover according to any one of claims 1 to 9, wherein the battery cover is arranged to cover an opening of the battery housing.