Battery cell and battery pack

Abstract

The utility model discloses a single battery and a battery pack, the single battery comprises a shell, a battery pack, a battery pack and a battery pack, the shell is internally provided with an accommodating cavity; the pole group is arranged in the accommodating cavity; the explosion-proof valve is arranged on the shell body; the side plate assembly is arranged in the containing cavity and located between the anti-explosion valve and the pole group, an exhaust area is formed on the side plate assembly, and the anti-explosion valve and the exhaust area are oppositely arranged. According to the battery monomer disclosed by the utility model, the explosion-proof valve is arranged on the shell, so that the discharge path of high-temperature gas is shortened, the high-temperature gas in the pole group is quickly gathered at the position of the explosion-proof valve, the high-temperature gas is prevented from being always positioned in the pole group, the safe exhaust of the battery monomer is ensured, and the safety coefficient of the battery monomer is improved; and the whole structure of the battery monomer is more reasonable, the production efficiency is improved, and the production and transportation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, and particularly relates to a battery cell and a battery pack. Background Art

[0002] It is pointed out in the related art that with the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day. The lithium electrode assembly is a core component for the safety and assembly of the battery pack, and its structural design is crucial for the safety of the electrode assembly. The current electrode assembly structures mostly adopt structures such as explosion-proof valves on the cover plate or extrusion shell structures. The current electrode assemblies mostly adopt the structure of explosion-proof valves on the cover plate, and the exhaust channels are prone to blockage. Content of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, the utility model provides a battery cell, and the battery cell has a simple structure and a high safety factor.

[0004] The utility model also provides a battery pack having the above battery cell.

[0005] The battery cell according to the first aspect of the utility model includes: a housing, an accommodation cavity is formed in the housing; an electrode assembly, the electrode assembly is arranged in the accommodation cavity; an explosion-proof valve, the explosion-proof valve is arranged on the housing; a side plate assembly, the side plate assembly is arranged in the accommodation cavity and located between the explosion-proof valve and the electrode assembly, an exhaust area is formed on the side plate assembly, and the explosion-proof valve is arranged opposite to the exhaust area.

[0006] According to the battery cell of the utility model, by arranging the explosion-proof valve on the housing, the discharge path of the high-temperature gas is shortened, the high-temperature gas inside the electrode assembly is quickly converged at the position of the explosion-proof valve, avoiding the high-temperature gas always staying inside the electrode assembly, ensuring that the battery cell can exhaust safely, improving the safety factor of the battery cell, making the overall structure of the battery cell more reasonable, improving the production efficiency, and reducing the production and transportation costs.

[0007] In some embodiments, the side plate assembly includes: a plate body and a support member, the exhaust area is formed on the plate body, and the support member is arranged on the exhaust area.

[0008] In some embodiments, the support member has a switchable support state and exhaust state. When the support member is in the support state, the support member supports the explosion-proof valve. When the support member is in the exhaust state, the support member melts to connect the accommodation cavity with the explosion-proof valve.

[0009] In some embodiments, the area of the exhaust area is not less than the opening area of the explosion-proof valve.

[0010] In some embodiments, the plate body is disposed on at least one side in the width direction of the electrode group and is connected to the electrode group.

[0011] In some embodiments, through holes are formed in the housing. The through holes are formed on at least one side in the width direction of the housing, and are disposed above the exhaust area and correspond to the exhaust area one by one. The explosion-proof valve is disposed at the through holes.

[0012] In some embodiments, the battery cell further includes: a cover plate assembly. A pole post is provided on the cover plate assembly. The cover plate assembly is disposed at the end of the electrode group and is connected to the pole post.

[0013] In some embodiments, the pole post and the explosion-proof valve are arranged on different sides of the housing.

[0014] In some embodiments, the support member is a hot-melt metal member.

[0015] The battery pack according to the second aspect of the present invention includes a plurality of battery cells according to the first aspect of the present invention above.

[0016] By providing a plurality of battery cells of the first aspect above, the battery pack according to the present invention improves the overall performance of the battery pack, ensures the use safety of the battery pack, reduces the risk coefficient of the battery pack, makes the overall structure of the battery pack more reasonable, improves the production efficiency and production quality, and reduces the production and transportation costs.

[0017] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the present invention;

[0019] Figure 2 is Figure 1 a schematic diagram of the battery cell shown in

[0020] Figure 3 is Figure 2 a cross-sectional schematic diagram of the battery cell shown in

[0021] Figure 4 is Figure 3 an assembly schematic diagram of the explosion-proof valve and the side plate assembly shown in

[0022] Figure 5 is Figure 1 a schematic diagram of the explosion-proof valve and the support member shown in

[0023] Reference numerals:

[0024] 100, battery cell; 1, housing; 11, through hole; 2, electrode group; 21, insulating sheet; 3, explosion-proof valve; 4, side plate assembly; 41, plate body; 42, support member; 5, cover plate assembly; Detailed implementation manners

[0025] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0026] Reference is made below to Figures 1 - 5 describe the battery cell 100 according to the embodiment of the first aspect of the present utility model.

[0027] As Figure 1 shown, the battery cell 100 according to the embodiment of the first aspect of the present utility model includes: a housing 1, an electrode group 2, an explosion-proof valve 3, and a side plate assembly 4.

[0028] Specifically, a receiving cavity is formed in the housing 1, the electrode group 2 is disposed in the receiving cavity, the explosion-proof valve 3 is disposed on the housing 1, the side plate assembly 4 is disposed in the receiving cavity and is located between the explosion-proof valve 3 and the electrode group 2, an exhaust area is formed on the side plate assembly 4, and the explosion-proof valve 3 is disposed opposite to the exhaust area. Thus, the structure of the battery cell 100 is simple and the exhaust effect is good.

[0029] For the battery cell 100 according to the embodiment of the present utility model, by disposing the explosion-proof valve 3 on the housing 1, the discharge path of the high-temperature gas is shortened, the high-temperature gas inside the electrode group 2 is quickly converged at the position of the explosion-proof valve 3, and the situation that the high-temperature gas always remains inside the electrode group 2 is avoided, ensuring that the battery cell 100 can exhaust safely, improving the safety factor of the battery cell 100, making the overall structure of the battery cell 100 more reasonable, improving the production efficiency, and reducing the production and transportation costs.

[0030] In some embodiments of the present utility model, as Figure 1 shown, the side plate assembly 4 includes: a plate body 41 and a support member 42, the exhaust area is formed on the plate body 41, and the support member 42 is disposed in the exhaust area. Thus, the side plate assembly 4 realizes the function of supporting the explosion-proof valve 3, and the side plate assembly 4 and the housing 1 cooperate to form a complete exhaust passage, and the side plate assembly 4 can protect the electrode group 2 from being damaged easily.

[0031] In some embodiments of the present utility model, the support member 42 has a switchable support state and an exhaust state. When the support member 42 is in the support state, the support member 42 supports the explosion-proof valve 3. When the support member 42 is in the exhaust state, the support member 42 melts so that the accommodation cavity communicates with the explosion-proof valve 3. It can be understood that when the electrode group 2 undergoes thermal runaway, the support member 42 melts so that the accommodation cavity communicates with the explosion-proof valve 3, ensuring that the explosion-proof valve 3 will not be blocked during exhaust, increasing the exhaust area, improving the exhaust efficiency, and enhancing the safety factor of the battery cell 100.

[0032] In some embodiments of the present utility model, as Figure 5 shown, the area S of the exhaust region is not less than the valve opening area F of the explosion-proof valve 3. Thus, the requirement for safe exhaust is met, the safety factor of the battery cell 100 is improved, and the overall structure of the battery cell 100 is made more reasonable.

[0033] In some embodiments of the present utility model, the plate body 41 is provided on at least one side in the width direction of the electrode group 2 and is connected to the electrode group 2. Thus, it is convenient for high-temperature gas to be discharged from the battery cell 100, and it is also convenient for assembly and use.

[0034] Furthermore, the plate body 41 and the insulating sheet 21 of the electrode group 2 are fixedly connected by means of hot melting and adhesives, playing a role in comprehensively protecting the electric connection, and protecting the explosion-proof valve 3 from being easily damaged.

[0035] In some embodiments of the present utility model, as Figure 1 shown, through holes 11 are formed in the housing 1. The through holes 11 are formed on at least one side in the width direction of the housing 1 and are arranged corresponding to the exhaust region above the exhaust region one by one. The explosion-proof valve 3 is provided at the through holes 11. Thus, when thermal runaway occurs, the path end can quickly exhaust gas, and gas-electric separation is achieved, which is convenient for high-temperature gas to be discharged from the battery cell 100, and the structure is simple, which is convenient for assembly and use.

[0036] In some embodiments of the present utility model, the battery cell 100 further includes: a cover plate assembly 5, and the cover plate assembly 5 is provided at the end of the electrode group 2 and is connected to the electrode post.

[0037] In some embodiments of the present utility model, an electrode post is provided on the cover plate assembly 5, and the electrode post and the explosion-proof valve 3 are arranged on different sides of the housing 1. Thus, the electrode post is protected from being damaged, the structural stability of the battery cell 100 is improved, and it is convenient for assembling multiple battery cells 100.

[0038] Preferably, the support member 42 is a hot-melt metal part.

[0039] The battery pack according to the second aspect embodiment of the present utility model includes a plurality of battery cells 100 according to the first aspect embodiment of the present utility model above.

[0040] According to the battery pack of the embodiment of the present utility model, by arranging a plurality of the battery monomers 100 of the first aspect embodiment, the overall performance of the battery pack is improved, the use safety of the battery pack is ensured, the risk coefficient of the battery pack is reduced, the overall structure of the battery pack is made more reasonable, the production efficiency and production quality are improved, and the production and transportation costs are reduced.

[0041] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present utility model.

[0042] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0043] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0044] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0045] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, Comprising: A housing, an accommodation cavity is formed inside the housing; An electrode group, the electrode group is arranged in the accommodation cavity; An explosion-proof valve, the explosion-proof valve is arranged on the housing; A side plate assembly, the side plate assembly is arranged in the accommodation cavity and located between the explosion-proof valve and the electrode group, an exhaust area is formed on the side plate assembly, the explosion-proof valve is arranged opposite to the exhaust area, the side plate assembly includes: a plate body and a support member, the exhaust area is formed on the plate body, the support member is arranged in the exhaust area, the support member has a support state and an exhaust state that can be switched, when the support member is in the support state, the support member supports the explosion-proof valve, when the support member is in the exhaust state, the support member melts so that the accommodation cavity communicates with the explosion-proof valve.

2. The battery cell according to claim 1, wherein, The area of the exhaust area is not less than the valve opening area of the explosion-proof valve.

3. The battery cell according to claim 1, characterized in that, The plate body is arranged on at least one side in the width direction of the electrode group and is connected to the electrode group.

4. The battery cell according to claim 3, characterized in that, A through hole is formed on the housing, the through hole is formed on at least one side in the width direction of the housing, and is arranged above and corresponding to the exhaust area one by one, the explosion-proof valve is arranged at the through hole.

5. The battery cell according to any one of claims 1-4, characterized in that Further comprising: A cover plate assembly, a pole column is arranged on the cover plate assembly, the cover plate assembly is arranged at the end of the electrode group and is connected to the pole column.

6. The battery cell according to claim 5, characterized in that, The pole column and the explosion-proof valve are arranged on different sides of the housing.

7. The battery cell according to claim 1, characterized in that, The support member is a heat-melting metal member.

8. A battery pack, characterized in that, Including a plurality of battery cells according to any one of claims 1-7.

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