Battery system

Abstract

The utility model discloses a battery system, and relates to the technical field of batteries. The battery system comprises at least two battery monomers, and the battery monomers comprise a first battery monomer and a second battery monomer; the first pressure relief structure of the first battery monomer is positioned on one side, close to the second battery monomer, of the first battery monomer; and a first protection structure is arranged outside the first pressure relief structure of the first battery monomer. According to the battery system provided by the invention, the damage risk of external foreign matters to the first pressure relief structure on the first battery monomer can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery system. BACKGROUND

[0002] In some battery devices, when at least two battery monomers, when one or more battery monomers appear thermal runaway and make the pressure relief structure of the battery monomer open, the ejected flammable substances or other external substances can damage other battery monomers, so as to easily make the pressure relief structure on other battery monomers be ablated, and even easily cause thermal spread phenomenon. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a battery system, which can reduce the damage risk of external foreign matters to the pressure relief structure on at least one battery monomer.

[0004] To achieve the above purpose, the battery system provided by the present application comprises a first battery monomer and a second battery monomer; a first pressure relief structure of the first battery monomer is located on a side of the first battery monomer close to the second battery monomer; and a first protection structure is arranged outside the first pressure relief structure of the first battery monomer.

[0005] In an embodiment, a second pressure relief structure of the second battery monomer is located on a side of the second battery monomer close to the first battery monomer; and a second protection structure is arranged outside the second pressure relief structure of the second battery monomer.

[0006] In an embodiment, the number of first battery monomers is at least two, and the at least two first battery monomers are arranged along a first direction; and the number of second battery monomers is at least two, and the at least two second battery monomers are arranged along a second direction.

[0007] In an embodiment, the first direction is parallel to the second direction.

[0008] In an embodiment, the first battery monomer further comprises:

[0009] a first shell;

[0010] a first cover plate arranged at one end of the first shell and close to the second battery monomer, wherein a pressure relief opening is arranged on the first cover plate; the first pressure relief structure is installed at the pressure relief opening; and the first protection structure is arranged on the first cover plate and located on a side of the first pressure relief structure facing the second battery monomer.

[0011] In an embodiment, a first installation groove is arranged on a side of the first cover plate close to the second battery monomer, the first installation groove is in communication with the pressure relief opening, and the first protection structure is installed in the first installation groove.

[0012] In an embodiment, the slot size of the first mounting slot is greater than the opening size of the pressure relief opening, and a bottom wall of the first mounting slot forms a limiting platform, and the first protection structure is arranged on the limiting platform.

[0013] In an embodiment, in the direction from the second battery cell to the first battery cell, the size between the edge of the projection of the first protection structure on the limiting platform and one side of the inner wall of the pressure relief opening is W, and 1mm≤W≤5mm.

[0014] A first gap is arranged between the first pressure relief structure and the first protection structure, and the size of the first gap is defined as H, and W≥2H.

[0015] In an embodiment, a second mounting slot is arranged on the side of the first cover plate away from the second battery cell, the second mounting slot is in communication with the pressure relief opening, the slot size of the second mounting slot is greater than the opening size of the pressure relief opening, and the first pressure relief structure is arranged in the second mounting slot.

[0016] In an embodiment, the first protection structure comprises:

[0017] a main body part covering at least part of the surface of the side of the first cover plate close to the second battery cell, and a communication opening in communication with the pressure relief opening is arranged on the main body part; and

[0018] a protection part arranged at the communication opening, and a part of the edge of the protection part is connected with the inner wall of the communication opening, and a second gap is arranged between another part of the edge of the protection part and the inner wall of the communication opening.

[0019] The technical solution of the present application is that the first pressure relief structure of the first battery cell is arranged on the side of the first battery cell close to the second battery cell, and the first protection structure is arranged outside the first pressure relief structure of the first battery cell, so that the first protection structure can block foreign matters outside the first battery cell or foreign matters sprayed from the second battery cell, thereby protecting the first pressure relief structure and reducing the damage risk of the first pressure relief structure caused by external foreign matters. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor based on the drawings shown.

[0021] Figure 1 Structure schematic diagram of an embodiment of a battery system provided in the present application;

[0022] Figure 2 Exploded structure schematic diagram of an embodiment of a battery cell provided in the present application;

[0023] Figure 3 Top view of an embodiment of a battery cell provided in the present application;

[0024] Figure 4 Structure schematic diagram of an embodiment of a battery system provided in the present application; Figure 3 Sectional view of A-A in the structure schematic diagram of the battery system provided in the present application;

[0025] Figure 5 Structure schematic diagram of an embodiment of a battery system provided in the present application; Figure 4 Enlarged view of a part of B in the structure schematic diagram of the battery system provided in the present application;

[0026] Figure 6 Exploded structure schematic diagram of another embodiment of a battery cell provided in the present application;

[0027] Figure 7 Structure schematic diagram of the connection between an insulating patch and a first protection structure in another embodiment of a battery cell provided in the present application;

[0028] Figure 8 Structure schematic diagram of another embodiment of a battery system provided in the present application.

[0029] Brief Description of the Drawings:

[0030] 100, first battery cell; 110, first shell; 1101, first inner cavity; 120, first cover plate; 1201, pressure relief port; 1202, first mounting groove; 1202a, limiting table; 1203, second mounting groove; 130, first pressure relief structure; 140, first protection structure; 141, main body part; 1411, communication port; 142, protection part; 100a, first gap; 100b, second gap;

[0031] 200, second battery cell;

[0032] 300, box.

[0033] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0035] It should be noted that if the application embodiments involve directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, movement, etc. between components in a certain posture, and if the certain posture changes, the directionality indication also changes accordingly.

[0036] In addition, if the application embodiments involve "first", "second" and the like, the "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0037] In some battery devices, the battery cells are placed in a side-down manner, and when at least two battery cells are arranged opposite to each other, the pressure relief structures on the two battery cells are placed in a face-to-face assembly manner. When one of the battery cells appears thermal runaway and the pressure relief structure of the battery cell opens, the flammable material or other external material sprayed by the pressure relief structure will damage the pressure relief structure of the opposite battery cell and even easily cause thermal spread phenomenon.

[0038] In order to reduce the damage risk of external foreign matter to the pressure relief structure on the battery cell, the application provides a battery cell.

[0039] Please refer to Figures 1 to 7 In an embodiment of the application, the battery system includes a first battery cell 100 and a second battery cell 200; the first pressure relief structure 130 of the first battery cell 100 is located on the side of the first battery cell 100 close to the second battery cell 200; and the first protection structure 140 is arranged outside the first pressure relief structure 130 of the first battery cell 100.

[0040] The first battery monomer 100 can be a square battery or a cylindrical battery, etc. The first pressure relief structure 130 of the first battery monomer 100 refers to a structure capable of relieving the gas inside the first battery monomer 100. The first pressure relief structure 130 in the present application can be a valve piece structure, or the first pressure relief structure 130 includes a mounting seat, the mounting seat is provided with a valve port, a valve rod is slidably arranged at the valve port, and the valve rod is provided with a blocking part for blocking the valve port. When the gas pressure inside the first battery monomer 100 is relatively large, it can push open the valve rod structure, so that the blocking part opens the valve port. It should be noted that the pressure relief structure is a known technology to those skilled in the art, and will not be described in detail here.

[0041] The first protection structure 140 refers to a structure capable of protecting the first pressure relief structure 130, thereby reducing the risk of damage to the first pressure relief structure 130 by external foreign matter. It can be understood that the first battery monomer 100 has a first inner cavity 1101, and in the present application, the first protection structure 140 is arranged outside the first pressure relief structure 130, that is, the first protection structure 140 is arranged on the side of the first pressure relief structure 130 away from the first inner cavity 1101 of the first battery monomer 100. The first protection structure 140 can be attached to the first pressure relief structure 130, or can be arranged separately from the first pressure relief structure 130. The first protection structure 140 can be a sheet structure, a cover structure or other structures, as long as it can shield the first pressure relief structure 130 to have a good protection effect on the first pressure relief structure 130.

[0042] The second battery monomer 200 can be a square battery or a cylindrical battery, etc. The structure of the second battery monomer 200 can be the same as or different from that of the first battery monomer 100. In order to make the second battery monomer 200 also have a pressure relief effect, a second pressure relief structure can be arranged on the second battery monomer 200. In order to reduce the damage of external foreign matter to the second pressure relief structure on the second battery monomer 200, a second protection structure can also be arranged outside the second pressure relief structure of the second battery monomer 200.

[0043] In the technical scheme of the present application, the first pressure relief structure 130 of the first battery monomer 100 is located on the side of the first battery monomer 100 close to the second battery monomer 200, and the first protection structure 140 is arranged outside the first pressure relief structure 130 of the first battery monomer 100. Therefore, the first protection structure 140 can block foreign matter outside the first battery monomer 100 or foreign matter ejected from the second battery monomer 200, thereby protecting the first pressure relief structure 130 and reducing the risk of damage to the first pressure relief structure 130 by external foreign matter.

[0044] Please refer to Figure 1As shown, in one embodiment of this application, the second pressure relief structure (not shown) of the second battery cell 200 is located on the side of the second battery cell 200 close to the first battery cell 100; a second protective structure (not shown) is provided outside the second pressure relief structure of the second battery cell 200.

[0045] The second pressure relief structure refers to a structure capable of relieving pressure on the gas inside the second battery cell 200. The second pressure relief structure can be a valve plate structure, or it can include a mounting base with a valve port on the mounting base, a valve stem slidably mounted at the valve port, and a sealing part on the valve stem for sealing the valve port. When the gas pressure inside the second battery cell 200 is high, it can push open the valve stem structure, causing the sealing part to open the valve port. It should be noted that since pressure relief structures are well-known technology to those skilled in the art, they will not be described in detail here. Specifically, the second pressure relief structure can be arranged face-to-face with the first pressure relief structure 130 of the first battery cell 100, or it can be arranged without facing face-to-face with the first pressure relief structure 130 of the first battery cell 100.

[0046] The second protective structure refers to a structure capable of protecting the second pressure relief structure, thereby reducing the risk of damage to the second pressure relief structure from external foreign objects. It is understood that the second battery cell 200 has a second inner cavity. In this application, the second protective structure is provided outside the second pressure relief structure, meaning that the second protective structure is located on the side of the second pressure relief structure opposite to the second inner cavity of the second battery cell 200. The second protective structure can be attached to the second pressure relief structure or spaced apart from it. The second protective structure can be a sheet-like structure, a cover structure, or other structures, as long as it can effectively shield the second pressure relief structure and provide good protection.

[0047] This configuration allows the first protective structure 140 to block foreign objects outside the first battery cell 100 or foreign objects ejected from inside the first battery cell 100, thereby protecting the first pressure relief structure 130 and reducing the risk of damage to the first pressure relief structure 130 from external foreign objects.

[0048] like Figure 1 As shown, in one embodiment of this application, the number of first battery cells 100 is at least two, and the at least two first battery cells 100 are arranged along a first direction; the number of second battery cells 200 is at least two, and the at least two second battery cells 200 are arranged along a second direction.

[0049] Specifically, the first direction and the second direction can be arranged in parallel or at an angle. When the first battery cell 100 is provided with at least two, the at least two first battery cells 100 can be arranged in series or in parallel. When the second battery cell 200 is provided with at least two, the at least two second battery cells 200 can be arranged in series or in parallel.

[0050] By setting the number of the first battery cells 100 and the number of the second battery cells 200 to be at least two, the capacity of the battery system can be increased.

[0051] As shown in the drawings, in an embodiment of the present application, the first direction is parallel to the second direction. Figure 1

[0052] By arranging the first direction and the second direction in parallel, the first battery cells 100 and the second battery cells 200 in the battery system can be arranged more neatly, and the occupied space of the two can be reduced. In addition, by such arrangement, one first battery cell 100 can be arranged corresponding to one second battery cell 200, so that the first protection structure 140 on each first battery cell 100 can block external foreign matters or foreign matters sprayed from the second battery cell 200, thereby reducing the risk of damage to the first pressure relief structure 130 on each first battery cell 100.

[0053] Taking the structure of the first battery cell 100 as an example for description. In an embodiment of the present application, the first battery cell 100 includes a first shell 110, a first cover plate 120, a first pressure relief structure 130, and a first protection structure 140; the first cover plate 120 is arranged at one end of the first shell 110 and close to the second battery cell 200, and the first cover plate 120 is provided with a pressure relief opening 1201; the first pressure relief structure 130 is installed at the pressure relief opening 1201; the first protection structure 140 is arranged on the first cover plate 120 and located on the side of the first pressure relief structure 130 facing the second battery cell 200.

[0054] ​The first shell 110 can be a cylindrical body, a cuboid or other shape, i.e., the structure of the first shell 110 has two open ends. For example, when the first shell 110 is a cylinder, the first shell 110 has a hollow cylindrical body, and both ends of the cylindrical body are provided with openings; when the first shell 110 is a cuboid, the first shell 110 includes a first side plate, a second side plate, a third side plate and a fourth side plate, wherein the first side plate and the second side plate are arranged opposite to each other, the third side plate and the fourth side plate are arranged opposite to each other, and the third side plate and the fourth side plate are located between the first side plate and the second side plate, and the first side plate, the second side plate, the third side plate and the fourth side plate form a hollow cylindrical body structure, and both ends of the cylindrical body are provided with openings. The hollow position of the first shell 110 is the first inner cavity 1101. The first cover plate 120 is arranged at one end of the first shell 110 to cover the opening of the first shell 110, thereby facilitating the wrapping of the first battery monomer 100, the tab assembly, the insulating film and other structures in the closed space. Specifically, the tab assembly can include a positive tab, a negative tab and a separator for isolating the positive tab and the negative tab. Of course, in order to insulate the positive tab and the negative tab from the first shell 110 to reduce the risk of short circuit between the positive tab and / or the negative tab and the metal first shell 110, in some examples, an insulating film is arranged between the positive tab and the first shell 110 and between the negative tab and the first shell 110. The positive tab is provided with a positive tab, and the negative tab is provided with a negative tab. When the first shell 110 has two openings, the end of the first shell 110 away from the first cover plate 120 can be provided with a second cover plate, and at least two poles can be arranged on the first cover plate 120 and the second cover plate respectively, or at least two poles are arranged on the first cover plate 120 or the second cover plate, and at least two poles are respectively electrically connected with the positive tab and the negative tab.

[0055] It can be understood that the first inner cavity 1101 of the first shell 110 is also provided with an electrolyte, and the electrolyte infiltrates the electrode piece assembly. The electrolyte will produce gas when it reacts. By providing the first cover plate 120 with a pressure relief port 1201, and installing the first pressure relief structure 130 at the pressure relief port 1201, when the gas reaches a preset gas pressure value, the first pressure relief structure 130 can be opened, thereby achieving the effect of gas release. By providing the first protection structure 140 on the first cover plate 120, the installation stability of the first protection structure 140 is improved. By providing the first protection structure 140 on the side of the first pressure relief structure 130 facing the second battery monomer 200, the protection effect of the first pressure relief structure 130 is improved, and the corrosion damage caused by the foreign matter sprayed from the second battery monomer 200 to the first pressure relief structure 130 on the first battery monomer 100 is reduced. It should be noted that the first protection structure 140 is made of insulating material, and when it is installed on the first cover plate 120, it can be bonded to the first cover plate 120 by bonding, or it can be connected to the first cover plate 120 by a spring or other connection method that facilitates the first protection structure 140 to open the pressure relief port 1201 under a larger air pressure. The first protection structure 140 can be installed in the pressure relief port 1201 of the first cover plate 120, or it can partially block the pressure relief port 1201, with the other part located outside the pressure relief port 1201, or the first protection structure 140 can be located outside the pressure relief port 1201. When the first protection structure 140 is installed in the pressure relief port 1201 of the first cover plate 120, it can be flush with the side of the first cover plate 120 facing the second battery monomer 200, or it can be completely located inside the pressure relief port 1201 and not flush with the side of the first cover plate 120 facing the second battery monomer 200.

[0056] Please refer to Figures 2 to 5 In some embodiments of the present application, the first cover plate 120 is provided with a first installation slot 1202 on the side close to the second battery monomer 200, and the first installation slot 1202 is in communication with the pressure relief port 1201; the first protection structure 140 is installed in the first installation slot 1202.

[0057] The first installation slot 1202 is provided on the side of the first cover plate 120 facing the second battery monomer 200 and is in communication with the pressure relief port 1201, so that the first installation slot 1202 and the pressure relief port 1201 are arranged in a direction perpendicular to the plate surface of the first cover plate 120. Specifically, the first protection structure 140 can be completely embedded in the first installation slot 1202; or the first protection structure 140 is partially embedded in the first installation slot 1202, and the other part is located outside the first installation slot 1202. Among them, the slot size of the first installation slot 1202 can be larger than the opening size of the pressure relief port 1201, or it can be smaller than the opening size of the pressure relief port 1201.

[0058] In this way, the space occupied by the battery system can be reduced, and the slot wall of the first mounting slot 1202 can also have a good limiting effect on the periphery of the first protection structure 140.

[0059] Please refer to Figures 2 to 5 In an embodiment of the present application, the slot size of the first mounting slot 1202 is greater than the opening size of the pressure relief port 1201, and the bottom wall of the first mounting slot 1202 forms a limiting table 1202a, and the first protection structure 140 is arranged on the limiting table 1202a.

[0060] It can be understood that the limiting table 1202a is an annular structure, and a through hole is formed in the middle thereof, and the size of the through hole is the size of the pressure relief port 1201.

[0061] In this way, when the external foreign matter abuts against the first protection structure 140, the limiting table 1202a can limit the first protection structure 140, thereby reducing the risk of the first protection structure 140 moving towards the first pressure relief structure 130 and being attached to the first pressure relief structure 130.

[0062] In some embodiments of the present application, the first protection structure 140 is bonded to the limiting table 1202a.

[0063] In this way, the stability of the installation of the first protection structure 140 can be improved. Specifically, the first protection structure 140 can be bonded to the limiting table 1202a by double-sided adhesive or other glue.

[0064] In other embodiments of the present application, the first protection structure 140 can also be inserted into the limiting table 1202a. For example, when the first protection structure 140 is inserted into the first side, one of the first protection structure 140 and the limiting table 1202a is provided with an insertion column, and the other is provided with an insertion hole, and the extension direction of the insertion column is arranged at an angle with the first protection structure 140, so that when the external foreign matter or gas has pressure on the first protection structure 140, the first protection structure 140 will be tightly attached to the limiting table 1202a, thereby improving the protection effect on the first pressure relief structure 130. When the air pressure inside the first battery cell 100 provided in the first protection structure 140 is too large, the first protection structure 140 can be easily pushed open to achieve good pressure relief effect.

[0065] Please refer to Figures 2 to 5 It can be understood that, in the direction from the second battery cell 200 to the first battery cell 100, the distance between the edge of the projection of the first protection structure 140 on the limiting table 1202a and the inner wall of the pressure relief port 1201 can be defined as W, and 1mm≤W≤5mm.

[0066] By setting W to be no less than 1 mm, the first protection structure 140 can be more stably arranged on the limiting table 1202a. By setting W to be no more than 5 mm, on the one hand, the size of the pressure relief opening 1201 can be reduced, and on the other hand, when the internal pressure of the first battery cell 100 arranged with the first protection structure 140 is too large, the first protection structure 140 can be timely and conveniently pried open, so as to ensure the effect of timely pressure relief.

[0067] Please refer to Figures 2 to 5 In some embodiments of the present application, a first gap 100a is arranged between the first pressure relief structure 130 and the first protection structure 140.

[0068] In this way, the risk that the first protection structure 140 is pried out of the pressure relief opening 1201 or even separated from the first cover plate 120 when the first pressure relief structure 130 is deformed and bulges can be reduced.

[0069] In an embodiment, the size of the first gap 100a is defined as H, and W≥2H. In this way, the thickness of the first cover plate 120 can be reduced, and the space occupied by the first cover plate 120 can be reduced.

[0070] Please refer to Figure 4 and Figure 5 In another example, the side of the first cover plate 120 away from the second battery cell 200 is provided with a second mounting groove 1203, the second mounting groove 1203 communicates with the pressure relief opening 1201, and the size of the opening of the second mounting groove 1203 is greater than the size of the opening of the pressure relief opening 1201; the first pressure relief structure 130 is arranged in the second mounting groove 1203.

[0071] In this way, the first pressure relief structure 130 and the first protection structure 140 can be spaced apart through the pressure relief opening 1201, so that a gap is arranged between the first pressure relief structure 130 and the first protection structure 140, thereby reducing the risk that the first protection structure 140 is pried out of the pressure relief opening 1201 or even separated from the first cover plate 120 when the first pressure relief structure 130 is deformed and bulges.

[0072] Please refer to Figure 6 and Figure 7 In some embodiments of the present application, the first protection structure 140 includes a main body part 141 and a protection part 142, the main body part 141 covers at least part of the surface of the side of the first cover plate 120 close to the second battery cell 200; the main body part 141 is provided with a communication opening 1411 communicating with the pressure relief opening 1201; the protection part 142 is mounted at the communication opening 1411, a part of the edge of the protection part 142 is connected with the inner wall of the communication opening 1411, and a second gap 100b is arranged between another part of the edge of the protection part 142 and the inner wall of the communication opening 1411.

[0073] The main body 141 covers at least part of the surface of the first cover plate 120 on the side close to the second battery cell 200, and thus can have a good insulation effect on the outer side of the first cover plate 120. The main body 141 is provided with a communication port 1411. When part of the edge of the protection portion 142 of the first protection structure 140 is connected to the inner wall of the communication port 1411, the two can be integrally formed or bonded, and the like, so that the protection portion 142 and the main body 141 together have a good insulation effect on the first cover plate 120, and on the other hand, the first protection structure 140 and the first cover plate 120 can be well connected.

[0074] In this way, on the one hand, the stability of the connection between the first protection structure 140 and the first cover plate 120 is ensured when the gas does not break through the first pressure relief structure 130, thereby reducing the risk of external foreign matter breaking through the first protection structure 140 to damage the first pressure relief structure 130. On the other hand, when the gas pressure in the first housing 110 is too large, the gas can further break the connection between the protection portion 142 and the inner wall of the communication port 1411 after breaking through the first pressure relief structure 130, thereby achieving the effect of lifting the first protection structure 140 to discharge the gas well.

[0075] Specifically, the edge of the protection portion 142 for connecting to the inner wall of the communication port 1411 can be a continuous section. Alternatively, it can include a plurality of connection sections arranged at intervals. In this way, the stability of the connection of the first protection structure 140 can be improved, and the connection between the protection portion 142 and the inner wall of the communication port 1411 can be broken more easily by the gas.

[0076] Please refer to Figure 6 and Figure 7 In some embodiments of the present application, part of the edge of the protection portion 142 is integrally connected to the inner wall of the communication port 1411.

[0077] By connecting part of the edge of the protection portion 142 to the inner wall of the communication port 1411, the material of the main body 141 and the protection portion 142 can be the same, that is, the main body 141 and the protection portion 142 can be integrated, thereby reducing the number of parts and installation steps and improving the installation efficiency.

[0078] In some embodiments of the present application, the material of the first protection structure 140 is asbestos fiber or glass fiber.

[0079] In this way, the melting point of the first protection structure 140 is relatively high, thereby improving the fireproof effect of the first protection structure 140, and reducing the risk of damage to the first pressure relief structure 130 in the event of a fire in the external environment.

[0080] As Figure 8As shown, the battery system can further include a box 300 in which the first battery cell 100 and the second battery cell 200 are arranged. The box 300 is configured to provide a containing space for the first battery cell 100 and the second battery cell 200, and the box 300 can have various structures. In some embodiments, the box 300 can include a first part and a second part, the first part and the second part are coupled to each other, and the first part and the second part together define a containing space for containing the first battery cell 100 and the second battery cell 200. The second part can be a hollow structure with one end open, and the first part can be a plate structure, the first part is coupled to the open end of the second part to define the containing space together with the second part. Alternatively, the first part and the second part can both be hollow structures with one end open, and the open end of the first part is coupled to the open end of the second part. Of course, the box 300 can have various shapes, such as a cylinder, a cuboid, etc.

[0081] The above merely illustrates the embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structure transformation based on the technical concept of the present application, or direct / indirect application in other related technical fields, are included in the patent protection scope of the present application.

Claims

1. A battery system, characterized in that, It includes a first battery cell and a second battery cell; a first pressure relief structure of the first battery cell is located on the side of the first battery cell closer to the second battery cell; a first protective structure is provided outside the first pressure relief structure of the first battery cell.

2. The battery system as claimed in claim 1, characterized in that, The second pressure relief structure of the second battery cell is located on the side of the second battery cell closer to the first battery cell; a second protective structure is provided outside the second pressure relief structure of the second battery cell.

3. The battery system as described in claim 1, characterized in that, The number of first battery cells is at least two, and the at least two first battery cells are arranged along a first direction; the number of second battery cells is at least two, and the at least two second battery cells are arranged along a second direction.

4. The battery system as described in claim 3, characterized in that, The first direction is parallel to the second direction.

5. The battery system according to any one of claims 1 to 4, characterized in that, The first battery cell also includes: First shell; A first cover plate is disposed at one end of the first housing and close to the second battery cell. The first cover plate is provided with a pressure relief port. A first pressure relief structure is installed at the pressure relief port. A first protective structure is disposed on the first cover plate and located on the side of the first pressure relief structure facing the second battery cell.

6. The battery system as claimed in claim 5, characterized in that, The first cover plate has a first mounting groove on the side near the second battery cell, and the first mounting groove is connected to the pressure relief port; the first protective structure is installed in the first mounting groove.

7. The battery system as claimed in claim 6, characterized in that, The opening size of the first mounting groove is larger than the opening size of the pressure relief port, the bottom wall of the first mounting groove forms a limiting platform, and the first protective structure is disposed on the limiting platform.

8. The battery system as claimed in claim 7, characterized in that, In the direction from the second battery cell to the first battery cell, the dimension W between the edge of the projection of the first protective structure on the limiting platform and one side of the inner wall of the pressure relief port is 1mm≤W≤5mm. A first gap is provided between the first pressure relief structure and the first protection structure, and the size of the first gap is defined as H, where W≥2H.

9. The battery system as claimed in claim 6, characterized in that, The first cover plate has a second mounting groove on the side opposite to the second battery cell. The second mounting groove is connected to the pressure relief port, and the groove size of the second mounting groove is larger than the opening size of the pressure relief port. The first pressure relief structure is located in the second mounting groove.

10. The battery system as claimed in claim 5, characterized in that, The first protective structure includes: The main body covers at least a portion of the surface of the first cover plate near the second battery cell; the main body has a communication port communicating with the pressure relief port; and A protective part is installed at the communication port, a portion of the edge of the protective part is connected to the inner wall of the communication port, and a second gap is provided between another portion of the edge of the protective part and the inner wall of the communication port.

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