Plate structure of battery pack, battery pack and electric equipment

Abstract

The utility model relates to a plate structure of a battery pack, the battery pack and electric equipment, the plate structure comprises a plate body, the plate body is provided with a first insulating layer located between the plate body and a battery monomer of the battery pack, the plate body is provided with a weakening part, and the weakening part is arranged opposite to a pressure relief part of the battery monomer; and the weakening part is configured to form a pressure relief channel communicated with the pressure relief piece when the battery monomer is subjected to thermal runaway. According to the technical scheme, the plate structure of the battery pack provided by the utility model can simplify a complex manufacturing process, meanwhile, the possibility of insulation and voltage resistance failure of the whole battery pack is reduced, and the safety of the whole battery pack is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of power-using equipment, in particular to a plate structure of a battery pack, a battery pack and a power-using equipment. BACKGROUND

[0002] In the related art, a pressure relief port is usually arranged in a battery pack to communicate with a pressure relief member of a battery monomer. However, due to the arrangement of the pressure relief port, a large-area targeted insulation protection treatment needs to be performed on the inner side vertical surface of the pressure relief port, which is relatively complex in process, low in efficiency and high in cost. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present disclosure is to provide a plate structure of a battery pack, a battery pack and a power-using equipment, so as to simplify the complex manufacturing process, reduce the possibility of insulation pressure failure of the whole battery pack, and at least partially solve the above technical problems.

[0004] To achieve the above purpose, the first aspect of the present disclosure provides a plate structure of a battery pack, the plate structure comprising a plate body, the plate body being provided with a first insulation layer between the plate body and a battery monomer of the battery pack, the plate body having a weakened portion, the weakened portion being arranged opposite to a pressure relief member of the battery monomer, and the weakened portion being configured to form a pressure relief channel communicating with the pressure relief member when the battery monomer occurs thermal runaway.

[0005] Optionally, the thickness of the weakened portion is less than the thickness of the plate body.

[0006] Optionally, the thickness of the weakened portion is 0.2-2 mm.

[0007] Optionally, the weakened portion comprises a notch structure forming the pressure relief channel.

[0008] Optionally, the plate body comprises a first plate body and a second plate body arranged in layers, the first insulation layer is located on a side of the first plate body away from the second plate body, and the weakened portion is located on at least one of the first plate body and the second plate body.

[0009] Optionally, the weakened portion is arranged on both the first plate body and the second plate body, the thickness of the weakened portion on the first plate body is less than the thickness of the first plate body, and the thickness of the weakened portion on the second plate body is less than the thickness of the second plate body.

[0010] Optionally, the weakened portion on the first plate body is recessed inwardly from a first surface of the first plate body away from the second plate body; and / or, the weakened portion on the second plate body is recessed inwardly from a second surface of the second plate body away from the first plate body.

[0011] Optionally, the first plate body and the weakening portion thereon are configured as one body; and / or, the second plate body and the weakening portion thereon are configured as one body.

[0012] Optionally, the weakening portion is located on the first plate body, and a hole structure is arranged on the second plate body opposite to the weakening portion.

[0013] Optionally, the thickness of the weakening portion is less than the thickness of the first plate body.

[0014] Optionally, the first plate body is connected with a bending portion bent towards the hole structure, the bending portion includes a bottom wall and a side wall surrounding the bottom wall and connected between the bottom wall and the first plate body, and the weakening portion is located on the bottom wall.

[0015] Optionally, the length of the side wall in the stacking direction of the first plate body and the second plate body is greater than the total thickness of the first plate body and the second plate body.

[0016] Optionally, the thickness of the weakening portion is less than the thickness of the first plate body and / or the thickness of the bending portion.

[0017] Optionally, the weakening portion, the bending portion and the first plate body are configured as one body.

[0018] Optionally, a channel for fluid communication is formed between the first plate body and the second plate body.

[0019] Optionally, the weakening portion includes a notch structure forming the pressure relief channel.

[0020] A second aspect of the present disclosure provides a battery pack, comprising: a battery monomer provided with a pressure relief member; and a shell comprising the plate structure provided in the first aspect, the battery monomer being arranged in the shell.

[0021] Optionally, the shell comprises a bottom plate assembly supporting the battery monomer, the bottom plate assembly comprising oppositely arranged first and second plates, a pressure relief cavity being formed between the first and second plates, the first plate being the plate structure and connected to the battery monomer, and the pressure relief channel being used to communicate the pressure relief member and the pressure relief cavity.

[0022] A third aspect of the present disclosure provides a power consumption device, comprising the battery pack provided in the second aspect.

[0023] By the technical solution, i.e., the plate structure of the battery pack provided by the present disclosure, the weakening portion is arranged on the plate body, and the weakening portion is arranged opposite to the pressure relief piece of the battery monomer, so that when the corresponding battery monomer is in thermal runaway, the rupture of the weakening portion at the corresponding position can be realized, thereby forming a pressure relief channel on the plate body that is in communication with the pressure relief piece to achieve the purpose of pressure relief. In this way, by the above arrangement, compared with the related art, it is not necessary to pre-arrange a pressure relief opening on the plate body that is in communication with the pressure relief piece of the battery monomer, and it is also not necessary to perform a large-area targeted insulation protection treatment on the inner side vertical surface of the pressure relief opening, so as to achieve the purpose of simplifying the complex manufacturing process and improving the efficiency and reducing the cost. At the same time, since it is not necessary to pre-arrange a pressure relief opening on the plate body that is in communication with the pressure relief piece of the battery monomer, it is also possible to avoid, for example, water vapor or heat entering the inside of the battery pack through, for example, the pressure relief opening, thereby reducing the possibility of insulation pressure failure of the entire battery pack and improving the safety of the entire battery pack. In addition, since the first insulation layer is arranged between the plate body and the battery monomer, the plate body can be insulated and protected by the first insulation layer. In this way, when the battery monomer is in thermal runaway, the electrically conductive substance discharged from the pressure relief piece can be prevented from directly contacting the plate body, thereby further reducing the possibility of insulation failure of the entire battery pack and helping to improve the safety of the battery pack.

[0024] Other features and advantages of the present disclosure will be described in detail in the following detailed description section. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and together with the following detailed description, serve to explain the present disclosure but do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 is a structural schematic diagram of a battery pack provided in an exemplary embodiment of the present disclosure;

[0027] Figure 2 is a top view of a battery pack provided in an exemplary embodiment of the present disclosure;

[0028] Figure 3 is Figure 2 is a sectional view at position A in FIG. 1;

[0029] Figure 4 is Figure 3 is a partial enlarged schematic view at position B in FIG. 1;

[0030] Figure 5 is a schematic diagram of a weakening portion of a battery pack after rupture provided in an exemplary embodiment of the present disclosure;

[0031] Figure 6is a schematic view of a weakened portion of a battery pack according to a second embodiment of the present disclosure;

[0032] Figure 7 is a schematic view of a weakened portion of a battery pack according to a third embodiment of the present disclosure;

[0033] Figure 8 is a schematic view of a weakened portion of a battery pack according to a fourth embodiment of the present disclosure.

[0034] Legend of Reference Signs

[0035] 1 - plate body; 110 - weakened portion; 111 - score structure; 120 - pressure relief passage; 130 - first plate body; 131 - first surface; 132 - third surface; 133 - bent portion; 1331 - bottom wall; 1332 - side wall; 140 - second plate body; 141 - second surface; 142 - hole structure; 150 - passage; 2 - battery cell; 210 - pressure relief member; 3 - first insulation layer; 4 - housing; 410 - bottom plate assembly; 411 - first plate; 412 - second plate; 413 - pressure relief cavity; 420 - frame. DETAILED DESCRIPTION

[0036] The specific embodiments of the present disclosure will be described in detail hereinafter with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory and are not intended to limit the present disclosure.

[0037] In the present disclosure, "inner, outer" means inner, outer with respect to the outline of the component or structure itself, unless otherwise specified. In addition, it should be noted that the terms such as "first, second" are used to distinguish one element from another element, and do not have sequential and important meanings. In addition, in the description with reference to the drawings, the same reference signs in different drawings represent the same elements.

[0038] According to a first aspect of the present disclosure, a plate structure of a battery pack is provided, as shown in Figures 1 to 8 the plate structure includes a plate body 1, a first insulation layer 3 is provided on the plate body 1 between the plate body 1 and a battery cell 2 of the battery pack, the plate body 1 has a weakened portion 110, the weakened portion 110 is arranged opposite to a pressure relief member 210 of the battery cell 2, and the weakened portion 110 is configured to form a pressure relief passage 120 in communication with the pressure relief member 210 when the battery cell 2 experiences thermal runaway.

[0039] By the technical solution, the plate structure of the battery pack is provided in the disclosure. The weakening portion 110 is arranged on the plate body 1, and the weakening portion 110 is arranged opposite to the pressure relief member 210 of the battery monomer 2. When the corresponding battery monomer 2 is in thermal runaway, the weakening portion 110 at the corresponding position is broken, a pressure relief channel 120 communicating with the pressure relief member 210 is formed on the plate body 1, and the purpose of pressure relief is achieved. In the above arrangement, the pressure relief port communicating with the pressure relief member of the battery monomer does not need to be preformed on the plate body, and the inner side vertical surface of the pressure relief port does not need to be treated with large-area targeted insulation and protection, so that the purpose of simplifying the complex manufacturing process is achieved, the efficiency is improved, and the cost is reduced. At the same time, since the pressure relief port communicating with the pressure relief member of the battery monomer does not need to be preformed on the plate body, water vapor or heat entering the inside of the battery pack through the pressure relief port can be avoided, the possibility of insulation and pressure failure of the whole battery pack is reduced, and the safety of the whole battery pack is improved.

[0040] In addition, since the first insulation layer 3 is arranged between the plate body 1 and the battery monomer 2, the plate body 1 can be insulated and protected by the first insulation layer 3. When the battery monomer 2 is in thermal runaway, the conductive substance discharged in the pressure relief member 210 can be prevented from directly contacting the plate body 1, the possibility of insulation failure of the whole battery pack is further reduced, and the safety of the battery pack is improved.

[0041] The first insulation layer 3 can be formed on the plate body 1 by, for example, spraying and coating an insulation protective coating to achieve insulation protection of the plate body 1 and improve the safety of the whole battery pack. At the same time, since the coating structure is light in weight, it is beneficial to the lightweight design of the battery pack. Of course, it should be noted that the inner wall surface of the pressure relief channel 413 (which will be described in detail below) can also be provided with an insulation protective coating. For example, the inner wall surface of the second plate 412 facing the battery monomer 2 and the second surface 141 of the second plate body 140 away from the first plate body 130 can be adaptively sprayed and coated with an insulation protective coating, further improving the safety of the whole battery pack.

[0042] Additionally, it should be noted that since there is no need to pre-open pressure relief ports on the plate body that connect to the pressure relief components of the battery cells, this can also play a role in isolating heat propagation in the event of thermal runaway, which is beneficial to improving the safety of the battery pack. That is, it can be understood that, for example, when the battery pack is working normally, the pressure relief channel 413 and the inside of the battery pack can be sealed and isolated by the presence of the weakened part 110. However, in the event of thermal runaway, the pressure relief component 210 of the thermally runaway battery cell 2 opens to release pressure, which can cause the weakened part 110 at the corresponding position to rupture, thereby forming a pressure relief channel 120 for pressure relief. At the same time, due to the presence of the weakened part 110, the thermal runaway gas in the pressure relief channel 413 will not flow through the pressure relief channel 413 to the pressure relief component 210 of other battery cells 2 that have not experienced thermal runaway, so that the weakened part 110 can play a role in isolating heat propagation, which helps to improve the safety of the entire battery pack.

[0043] To facilitate the breaking of the weakened portion 110, in some embodiments, reference is made to... Figures 4 to 8 As shown, along the first direction (which can be referenced to the height direction of the battery pack, or the connection direction between the battery cell 2 and the plate 1 of the battery pack, or also referenced to...), Figure 4 In the vertical direction of the middle drawing, the thickness of the weakened part 110 can be less than the thickness of the plate 1, so that after thermal runaway, the weakened part 110 can be broken through by the high-temperature and high-pressure gas ejected from the pressure relief component 210, so as to achieve the purpose of pressure relief through the pressure relief channel 120.

[0044] For example, in some embodiments, the thickness of the weakened portion 110 along the first direction can be 0.2 to 2 mm. For example, the thickness of the weakened portion 110 along the first direction can be 0.2 mm, 0.4 mm, 0.6 mm, 1.2 mm, etc. This disclosure is not limited to this. The purpose is to facilitate the breaking of the weakened portion 110. Those skilled in the art can adaptively design the thickness of the weakened portion 110 according to the actual application requirements.

[0045] Additionally, along the second direction (the second direction is perpendicular to the first direction, see reference) Figure 4 In the left-right direction of the middle drawing (or, with reference to the length or width direction of the battery pack), the width dimension of the weakened portion 110 is not specifically limited in this disclosure. Its purpose is to allow the weakened portion 110 to be arranged opposite to the pressure relief component 210 of the battery cell 2, so as to facilitate, for example... Figure 4 When the pressure relief component 210 releases pressure, the pressure F1 generated acts on the weakened part 110, which facilitates the rupture of the weakened part 110.

[0046] The weakening portion 110 can be configured in any suitable manner. For example, in some embodiments, the weakening portion 110 can be a groove structure formed on at least one of the first plate body 130 and the second plate body 140 of the plate body 1. For example, the groove structure can be machined on at least one of the first plate body 130 and the second plate body 140 by a CNC (Computer Numerical Control) machining process. It can be understood that the weakening portion 110 can be formed by thinning the first plate body 130 and / or the second plate body 140 at a position opposite to the pressure relief member 210 on the first plate body 130 and / or the second plate body 140, so as to facilitate the rupture of the weakening portion 110 during thermal runaway, thereby achieving the purpose of pressure relief.

[0047] Alternatively, the weakening portion 110 can also include a score structure 111 forming the pressure relief passage 120. For example, Figure 4 and Figure 7 As shown, the score structure 111 can be machined on the first plate body 130 and / or the second plate body 140 in a ring shape by a CNC machining process, so as to facilitate the rupture of the ring-shaped score structure 111 during thermal runaway, thereby achieving the purpose of pressure relief through the pressure relief passage 120 formed by the weakening portion 110. It should be noted that the score structure 111 is not limited to a ring shape. For example, in another embodiment not shown, the score structure 111 can be arranged discontinuously around the circumference of the pressure relief passage 120. The present disclosure does not limit such a modified form, and those skilled in the art can adaptively design it according to the actual application requirements, the purpose of which is to facilitate the rupture of the weakening portion 110 (score structure 111) during thermal runaway of the battery cell 2.

[0048] In addition, it should be noted that the above-mentioned groove structure machined on the first plate body 130 and / or the second plate body 140 by a CNC machining process to achieve the thinning of the first plate body 130 and / or the second plate body 140 at a position opposite to the pressure relief member 210, and the weakening treatment of the score structure 111 machined on the first plate body 130 and / or the second plate body 140 by a CNC machining process, can be performed simultaneously, which can better improve the weakening effect of the weakening portion 110.

[0049] In addition, it should be noted that when the groove structure and the notch structure 111 are machined on the first plate body 130 and / or the second plate body 140 by the above-mentioned machining method such as CNC (Computer Numerical Control), although the groove structure and the notch structure 111 also have vertical surfaces, compared with the method of opening a pressure relief port, the area of the vertical surface can be effectively reduced. Thus, when the insulating layer is formed on the plate body 1 by the above-mentioned method such as spraying, the vertical surface of the groove structure and the notch structure 111 can be insulated by, for example, the accumulation of the insulating layer, without the need for a large-area targeted insulation protection treatment of the inner vertical surface of the pressure relief port, thereby simplifying the process, improving efficiency, and reducing costs.

[0050] In some embodiments, with reference to Figures 4 to 8 As shown, the plate body 1 can include a first plate body 130 and a second plate body 140 arranged in layers, the first insulating layer 3 is located on the side of the first plate body 130 away from the second plate body 140, and the weakening portion 110 is located on at least one of the first plate body 130 and the second plate body 140, so that the weakening portion 110 can seal and isolate the pressure relief channel 413 and the inside of the battery pack, and at the same time, when thermal runaway occurs, the rupture of the weakening portion 110 can be facilitated to relieve pressure through the pressure relief channel 120 formed by the weakening portion 110. In addition, since there is no need to pre-open a pressure relief port on the plate body for communication with the pressure relief member of the battery monomer, there is also no need for a large-area targeted insulation protection treatment of the inner vertical surface of the pressure relief port, so as to simplify the complex manufacturing process, improve efficiency, and reduce costs.

[0051] Among them, the plate body 1 can include, for example, a liquid cooling plate structure, and Figure 4 As shown, for example, the liquid cooling plate structure can include the above-mentioned first plate body 130 and second plate body 140 arranged in layers, and a channel 150 for the flow of fluid (such as a cooling medium) is formed between the first plate body 130 and the second plate body 140. In this way, not only can the battery monomer 2 be cooled by the liquid cooling plate structure, but also the pressure relief can be achieved by the liquid cooling plate structure, and the integration degree is high.

[0052] Of course, alternatively, the plate body 1 can also include, for example, a support plate structure, so that by integrating the above-mentioned weakening portion 110 on the support plate structure, not only can the support plate structure support the battery monomer 2, but also the support plate structure can achieve pressure relief operation when thermal runaway occurs. The present disclosure does not make specific limitations on such deformation methods, and those skilled in the art can adaptively design according to actual application requirements.

[0053] In some example embodiments, referring to Figure 8 As shown in FIG. 1, the first plate body 130 and the second plate body 140 can each be provided with the weakened portion 110 described above, and in the first direction, the thickness of the weakened portion 110 on the first plate body 130 is less than the thickness of the first plate body 130, and the thickness of the weakened portion 110 on the second plate body 140 is less than the thickness of the second plate body 140. In this way, through the above arrangement, the first plate body 130 and the second plate body 140 can each not need to be pre-provided with a pressure relief port in communication with the pressure relief member 210 of the battery monomer 2, and can also not need to be provided with a large-area targeted insulation protection treatment on the inner side of the pressure relief port, facilitating the processing and preparation of the first plate body 130 and the second plate body 140, so as to achieve the purpose of simplifying the complex manufacturing process, improving efficiency and reducing cost.

[0054] As shown in FIG. 1, the first plate body 130 and the second plate body 140 can each be provided with the weakened portion 110 described above, and in the first direction, the thickness of the weakened portion 110 on the first plate body 130 is less than the thickness of the first plate body 130, and the thickness of the weakened portion 110 on the second plate body 140 is less than the thickness of the second plate body 140. In this way, through the above arrangement, the first plate body 130 and the second plate body 140 can each not need to be pre-provided with a pressure relief port in communication with the pressure relief member 210 of the battery monomer 2, and can also not need to be provided with a large-area targeted insulation protection treatment on the inner side of the pressure relief port, facilitating the processing and preparation of the first plate body 130 and the second plate body 140, so as to achieve the purpose of simplifying the complex manufacturing process, improving efficiency and reducing cost. Figure 8 In addition, as shown in FIG. 1, the weakened portion 110 on the second plate body 140 can be recessed inwardly from the second surface 141 of the second plate body 140 away from the first plate body 130, so as to be machined on the second plate body 140 in a groove structure through, for example, CNC (Computer Numerical Control) machining, so as to achieve the purpose of thinning the plate body by adopting the recessed manner on the second plate body 140, facilitating the rupture of the weakened portion 110 on the second plate body 140 after thermal runaway, so as to achieve the purpose of pressure relief.

[0055] Figure 8 In addition, as shown in FIG. 1, the weakened portion 110 on the second plate body 140 can be recessed inwardly from the second surface 141 of the second plate body 140 away from the first plate body 130, so as to be machined on the second plate body 140 in a groove structure through, for example, CNC (Computer Numerical Control) machining, so as to achieve the purpose of thinning the plate body by adopting the recessed manner on the second plate body 140, facilitating the rupture of the weakened portion 110 on the second plate body 140 after thermal runaway, so as to achieve the purpose of pressure relief.

[0056] In addition, as shown in FIG. 1, the weakened portion 110 on the second plate body 140 can be recessed inwardly from the second surface 141 of the second plate body 140 away from the first plate body 130, so as to be machined on the second plate body 140 in a groove structure through, for example, CNC (Computer Numerical Control) machining, so as to achieve the purpose of thinning the plate body by adopting the recessed manner on the second plate body 140, facilitating the rupture of the weakened portion 110 on the second plate body 140 after thermal runaway, so as to achieve the purpose of pressure relief.

[0057] Alternatively, in some example embodiments, referring to Figures 4 to 7 ​As shown, the weakening portion 110 can also be located on the first plate body 130, and the second plate body 140 is provided with a hole structure 142 opposite the position of the weakening portion 110. In this way, through the above arrangement, when the thermal runaway occurs, after the weakening portion 110 on the first plate body 130 breaks, a pressure relief channel 120 can be formed in the weakening portion 110 on the first plate body 130 to achieve pressure relief. At the same time, due to the fact that Figure 4 As shown, when the pressure relief member 210 is relieved, the pressure F1 generated is usually at the position with the maximum pressure. In this way, the weakening portion 110 can be broken by the pressure F1, and the part of the weakening portion 110 remaining on the first plate body 130 will also be deformed by the high-temperature and high-pressure gas sprayed by the pressure relief member 210 to bend away from the side where the battery monomer 2 is located. Thus, the second plate body 140, especially the inner side wall surface (vertical surface) of the hole structure 142 of the second plate body 140, can be shielded and protected, thereby avoiding direct contact between the high-temperature conductive material sprayed by the pressure relief member 210 and the inner side wall surface of the hole structure 142, and improving the safety of the entire battery pack.

[0058] In addition, it should be noted that since the present disclosure can be provided with the weakening portion 110 on the first plate body 130, and the part of the weakening portion 110 remaining on the first plate body 130 after the weakening portion 110 on the first plate body 130 breaks can shield and protect the inner side wall surface (vertical surface) of the hole structure 142 of the second plate body 140, for this purpose, it is possible to reduce the insulation protection area of the inner side wall surface (vertical surface) of the hole structure 142 of the plate body 1, or even unnecessary to perform large-area targeted insulation protection treatment on the hole structure 142. By shielding and protecting the part of the weakening portion 110 remaining on the first plate body 130, it is possible to avoid direct contact between the high-temperature conductive material sprayed by the pressure relief member 210 and the inner side wall surface of the hole structure 142, so as to achieve the purpose of simplifying the process flow, improve the production efficiency, and reduce the production cost.

[0059] The thickness of the weakening portion 110 can be less than the thickness of the first plate body 130. For example, as shown in Figure 6As shown, the weakened portion 110 can be concave to the third surface 132 of the first plate body 130 towards the second plate body 140, and the weakened portion 110 is flush to the first surface 131 of the first plate body 130 away from the second plate body 140, that is, it can be understood that, for example, a groove structure can be machined on the first plate body 130 by means of CNC (Computer Numerical Control) machining, so as to realize the thinning treatment of the first plate body 130, and thus arranged, when thermal runaway occurs, it is convenient to realize the rupture of the weakened portion 110, and at the same time, since the weakened portion 110 is flush to the first surface 131 of the first plate body 130 away from the second plate body 140, it is also convenient to spray and apply an insulating protective coating on the first surface 131 on site, so as to achieve the insulation protection of the plate body 1.

[0060] Of course, the specific embodiment that the weakened portion 110 is flush to the first surface 131 of the first plate body 130 away from the second plate body 140 is exemplary, and in other unillustrated embodiments, the weakened portion 110 can also be concave to the first surface 131 of the first plate body 130 away from the second plate body 140.

[0061] Alternatively, in other unillustrated embodiments, the weakened portion 110 can also be concave to the first surface 131 of the first plate body 130 away from the second plate body 140, and the weakened portion 110 is concave or flush to the third surface 132 of the first plate body 130 towards the second plate body 140, and the present disclosure does not make specific limitations on such deformation modes, and those skilled in the art can adaptively design according to the actual application requirements, and the purpose is to facilitate the rupture of the weakened portion 110 when thermal runaway occurs.

[0062] In addition, considering that the part of the weakened portion 110 remaining on the first plate body 130 after the weakened portion 110 is broken can better realize the shielding protection of the inner side wall surface (facade) of the hole structure 142 of the second plate body 140, exemplarily, Figure 4 As shown, the first plate body 130 can be connected with a bending portion 133 bent towards the hole structure 142, the bending portion 133 includes a bottom wall 1331 and a side wall 1332 surrounding the bottom wall 1331 and connected between the bottom wall 1331 and the first plate body 130, and the weakened portion 110 is located on the bottom wall 1331, so that, through the above arrangement, when thermal runaway occurs, the side wall 1332 of the bending portion 133 can remain on the first plate body 130 after the weakened portion 110 on the bottom wall 1331 is broken, so that the side wall 1332 of the bending portion 133 can better realize the shielding protection of the inner side wall surface (facade) of the hole structure 142 of the second plate body 140, which helps to improve the safety of the whole battery pack.

[0063] In order to improve the shielding and protection effect of the sidewall 1332 of the bent portion 133 on the inner wall (vertical surface) of the hole structure 142 of the second plate 140, in some embodiments, the sidewall 1332 is positioned in the stacking direction of the first plate 130 and the second plate 140 (or in the direction of...). Figure 4 The length of the first plate 130 (in the first direction shown) can be greater than the total thickness of the first plate 130 and the second plate 140, so that after thermal runaway, the weakened portion 110 on the bottom wall 1331 can be punched open, thereby improving the shielding and protection effect of the side wall 1332 of the remaining bent portion 133 on the first plate 130 on the inner wall (elevation) of the hole structure 142 of the second plate 140.

[0064] In addition, such as Figure 4 As shown, the aforementioned notch structure 111 can be provided between the bottom wall 1331 and the side wall 1332 to ensure that after the weakened portion 110 on the bottom wall 1331 is punched open, the side wall 1332 of the bent portion 133 remains on the first plate 130. Furthermore, as... Figure 4 As shown, the bottom wall 1331 on the side opposite to the battery cell 2 may have the aforementioned groove structure to facilitate the thinning of the bottom wall 1331 and to facilitate cracking at the bottom wall 1331. This disclosure is not limited thereto.

[0065] It should be noted that, in order to facilitate the cracking of the weakened portion 110, the thickness of the weakened portion 110 can be less than the thickness of the first plate 130 and / or the bending portion 133. For example, as shown in the figure... Figure 4 As shown, for example, the thickness of the groove structure 111 between the bottom wall 1331 and the side wall 1332 along the first direction can be less than the thickness of the groove structure on the bottom wall 1331 along the first direction, and the thickness of the groove structure along the first direction is less than the thickness of the first plate 130 and the bent portion 133 along the first direction, so as to facilitate the rupture of the weakened portion 110 (groove structure and groove structure 111) in the event of thermal runaway.

[0066] In addition, the aforementioned weakening part 110, bending part 133 and first plate 130 can be constructed as a whole, so that the weakening part 110 can be directly processed on the first plate 130, which facilitates on-site production and simplifies the process flow.

[0067] According to a second aspect of the present disclosure, a battery pack is provided, which comprises a battery cell 2 and a housing 4, the battery cell 2 is provided with a pressure relief member 210; the housing 4 comprises the plate structure provided in the first aspect, and the battery cell 2 is arranged in the housing 4, so as to simplify the complex manufacturing process, while reducing the possibility of failure of the overall insulation voltage resistance of the battery pack, and improving the safety of the battery pack. In addition, the battery pack also has all the beneficial effects of the plate structure of the battery pack provided in the first aspect, which will not be repeated here.

[0068] In some embodiments, referring to Figures 1 to 4 The housing 4 can comprise a bottom plate assembly 410 supporting the battery cell 2, the bottom plate assembly 410 comprises a first plate 411 and a second plate 412 arranged oppositely, a pressure relief cavity 413 is formed between the first plate 411 and the second plate 412, the first plate 411 is the plate structure described above and is connected to the battery cell 2, and the pressure relief passage 120 is used to communicate the pressure relief member 210 and the pressure relief cavity 413. In this way, through the above arrangement, when the battery cell 2 is in thermal runaway, the weakening portion 110 can be broken, so as to form the pressure relief passage 120 on the first plate 411 that communicates with the pressure relief cavity 413, so as to relieve pressure, and due to the presence of the weakening portion 110, when the battery pack is working normally, water vapor can also be prevented from entering the battery pack through the pressure relief cavity 413 of the bottom plate assembly 410 to cause failure of the overall insulation voltage resistance of the battery pack, thereby improving the safety of the battery pack.

[0069] Optionally, in some embodiments, referring to Figures 1 to 3 The housing 4 can further comprise a frame 420 arranged on the bottom plate assembly 410, and the bottom plate assembly 410 and the frame 420 enclose a containing groove for placing the battery cell 2. It should be noted that in some embodiments not shown, the plate body of the frame 420 described above can also comprise the plate structure provided in the first aspect, so that when the battery cell 2 is in thermal runaway, the weakening portion 110 can be broken, so as to form the pressure relief passage 120 on the plate body 1 that communicates with the pressure relief cavity 413, so as to achieve the purpose of relieving pressure through the pressure relief cavity 413 arranged in the frame 420.

[0070] It should be noted that the pressure relief member 210 described above can adopt any suitable structure according to actual application requirements, for example, the pressure relief member 210 can be, for example, a explosion-proof valve, a pressure relief valve or a safety valve, etc., which is not limited in the present disclosure. In addition, the battery cell 2 described above can be configured in the form of, for example, a battery cell, which is the smallest discharge power source in a battery device, and contains a positive and negative electrode separator film and a battery cell housing, etc.

[0071] According to a third aspect of the present disclosure, a power consuming device is provided, which comprises the battery pack provided in the second aspect. The power consuming device has all the advantages of the battery pack provided in the second aspect, which will not be repeated herein.

[0072] In some exemplary application scenarios, the power consuming device can be a vehicle, which can be a new energy vehicle, such as a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc., which will not be limited herein.

[0073] Of course, in other application scenarios, the power consuming device can also be a carrier that needs to be powered by the battery pack, such as in the field of energy storage, space transportation, or water transportation, etc.

[0074] The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0075] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations will not be described again in the present disclosure.

[0076] Furthermore, any combination of various different embodiments of the present disclosure can also be made, as long as it does not deviate from the idea of the present disclosure, and it should also be considered as disclosed in the present disclosure.

Claims

1. A plate structure of a battery pack, characterized by, The plate structure includes a plate body, on which a first insulating layer is disposed between the plate body and the battery cells of the battery pack. The plate body has a weakening portion, which is arranged opposite to the pressure relief component of the battery cell. The weakening portion is configured to form a pressure relief channel communicating with the pressure relief component when the battery cell experiences thermal runaway.

2. The plate structure of the battery pack according to claim 1, characterized by, The thickness of the weakened portion is less than the thickness of the plate body.

3. The plate structure of a battery pack according to claim 2, characterized by, The thickness of the weakened part is 0.2~2mm.

4. The plate structure of the battery pack according to any one of claims 1-3, characterized in that, The weakened portion includes a grooved structure that forms the pressure relief channel.

5. The plate structure of the battery pack according to claim 1, characterized in that, The plate body includes a first plate body and a second plate body arranged in layers, the first insulating layer is located on the side of the first plate body opposite to the second plate body, and the weakening portion is located on at least one of the first plate body and the second plate body.

6. The plate structure of the battery pack according to claim 5, characterized in that, Both the first plate and the second plate are provided with the weakening portion. The thickness of the weakening portion on the first plate is less than the thickness of the first plate, and the thickness of the weakening portion on the second plate is less than the thickness of the second plate.

7. The plate structure of the battery pack according to claim 6, characterized in that, The weakened portion on the first plate is recessed into a first surface of the first plate that is opposite to the second plate; and / or, the weakened portion on the second plate is recessed into a second surface of the second plate that is opposite to the first plate.

8. The plate structure of the battery pack according to claim 6, characterized in that, The first plate and the weakened portion thereon are integrally constructed; and / or, the second plate and the weakened portion thereon are integrally constructed.

9. The plate structure of the battery pack according to claim 5, characterized in that, The weakened portion is located on the first plate, and the second plate has a hole structure opposite to the position of the weakened portion.

10. The plate structure of the battery pack according to claim 9, characterized in that, The thickness of the weakened portion is less than the thickness of the first plate.

11. The plate structure of the battery pack according to claim 9, characterized in that, The first plate is connected to a bent portion that bends toward the hole structure. The bent portion includes a bottom wall and a side wall that surrounds the bottom wall and connects between the bottom wall and the first plate. The weakened portion is located on the bottom wall.

12. The plate structure of the battery pack according to claim 11, characterized in that, The length of the sidewall in the stacking direction of the first plate and the second plate is greater than the total thickness of the first plate and the second plate.

13. The plate structure of the battery pack according to claim 11, characterized in that, The thickness of the weakened portion is less than the thickness of the first plate and / or the bent portion.

14. The plate structure of the battery pack according to claim 11, characterized in that, The weakened part, the bent part, and the first plate are constructed as a single unit.

15. The plate structure of the battery pack according to claim 5, characterized in that, A channel for fluid flow is formed between the first plate and the second plate.

16. The plate structure of the battery pack according to any one of claims 5-15, characterized in that, The weakened portion includes a grooved structure that forms the pressure relief channel.

17. A battery pack, characterized in that, include: A battery cell, wherein the battery cell is provided with a pressure relief device; and A housing, the housing comprising the plate structure as described in any one of claims 1-16, wherein the battery cell is disposed within the housing.

18. The battery pack according to claim 17, characterized in that, The housing includes a base plate assembly that supports the battery cell. The base plate assembly includes a first plate and a second plate arranged opposite to each other, and a pressure relief cavity is formed between the first plate and the second plate. The first plate is the plate structure and is connected to the battery cell. The pressure relief channel is used to connect the pressure relief component and the pressure relief cavity.

19. An electrical appliance, characterized in that, Includes the battery pack as described in claim 17 or 18.

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