Battery module, nail penetration prevention method for battery module, and vehicle

Abstract

A battery module, a nail penetration prevention method for a battery module, and a vehicle. The battery module includes a plurality of battery cells, the plurality of battery cells including a first battery cell group and a second battery cell group that are connected in series and disposed opposite each other, the first battery cell group and the second battery cell group each including at least one battery cell, a protection assembly disposed between the first battery cell group and the second battery cell group and including a first metal member, a first insulating member, and a second metal member that are stacked, and protection components, each of which is disposed between two adjacent battery cells and can interrupt a circuit. When the test steel nail passes sequentially through a battery cell corresponding to the first metal member in the first battery cell group, the first metal member, the first insulating member, and the second metal member, the battery module forms a loop, and when the test steel nail penetrates a battery cell corresponding to the second metal member in the second battery cell group, a new short-circuit loop is added to the battery module.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to and the benefit of Chinese Patent Application No. 202210473891.7, entitled "BATTERY MODULE, NAIL PENETRATION PROTECTION METHOD FOR BATTERY MODULE, AND VEHICLE," filed on April 29, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to a battery module, a battery module needle stab protection The present invention relates to a method and a vehicle having a battery module. [Background technology]

[0003] Existing batteries, especially lithium iron phosphate batteries, needle When subjected to a stab test, a single lithium iron phosphate battery: needle Not prone to fire or explosion under stab conditions; needle However, when batteries are connected in series, especially when there are three or more batteries connected in series, severe arcing, fire, and combustion may occur. needle This can happen during a prick test. Summary of the Invention [Problem to be solved by the invention]

[0004] The purpose of this disclosure is to needle To provide a battery module to solve the technical problem of being prone to arcing, fire and combustion during stab testing.

[0005] Another object of the present disclosure is to provide a battery module needle stab protection The purpose is to provide a method. needle stab protection The method is: needle The safety performance of the battery module during the stab test can be improved.

[0006] It is still another object of the present disclosure to provide a vehicle having the aforementioned battery module that can improve safety performance. [Means for solving the problem]

[0007] According to a first aspect of the present disclosure, a battery module is provided, including a plurality of battery cores, a protection assembly, and a protection component. The plurality of battery cores are connected in series. The plurality of battery cores include a first battery core group and a second battery core group arranged opposite each other. The first battery core group and the second battery core group are each provided with at least one of the battery cores. The protection assembly is arranged between the first battery core group and the second battery core group, and includes a stacked first metal member, a first insulating member, and a second metal member. The first metal member is arranged opposite at least one of the battery cores in the first battery core group, and the second metal member is arranged opposite at least one of the battery cores in the second battery core group. The protection component is arranged between two of the adjacently arranged battery cores and is configured to interrupt a circuit. Test steel needle is attached to the first metal member in the first battery core group. Relative When the battery core, the first metal member, the first insulating member, and the second metal member are passed through in this order, the battery module circuit is formed. Test steel needle to the second metal member in the second battery core group Relative If it penetrates the battery core, it may cause a short circuit in the battery module. circuit will be added.

[0008] In one embodiment, the first insulation member includes a first insulation layer and a second insulation layer, the protection assembly includes a first composite layer and a second composite layer, the first composite layer includes a first insulation layer and a first metallic member, and the second composite layer includes a second insulation layer and a second metallic member.

[0009] In one embodiment, the protection assembly further includes a second insulating member disposed between the first battery core group and the first metal member and / or between the second battery core group and the second metal member.

[0010] In one embodiment, the protection component is a fuse.

[0011] In one embodiment, the first metal member and the second metal member are each elongated sheet-like members, the ends of which along their lengths are connected to the terminals of the battery core.

[0012] In one embodiment, the position at which the sheet-shaped body is connected to the battery cores in the corresponding first or second battery core group is adjustable.

[0013] In one embodiment, the sheet-shaped body includes a main body and an electrical connection piece. The main body has an elongated shape, and the electrical connection piece is disposed at an end of the main body along the length direction. The length of the electrical connection piece is less than the width of the main body, and the electrical connection piece is a bent member.

[0014] In one embodiment, the number of battery cores in the first battery core group is equal to the number of battery cores in the second battery core group.

[0015] According to a second aspect of the present disclosure, there is provided a battery module needle stab protection A method is provided. The battery module is a battery module according to any one of the above. needle stab protection The method comprises the steps of: needle is attached to the first metal member in the first battery core group. Relative When the battery core, the first metal member, and the first insulating member are sequentially penetrated to the second metal member, circuit is formed. Test steel needle to the second metal member in the second battery core group RelativeIf it penetrates the battery core, it may cause a short circuit in the battery module. circuit will be added.

[0016] According to a third aspect of the present disclosure, there is provided a vehicle, the vehicle including a battery module according to any one of the above.

[0017] In one embodiment, a protection assembly is disposed between a first battery core group and a second battery core group that are disposed opposite each other. Through cooperation between the protection assembly and the protection component, when multiple battery cores are connected in series, needle Arcing, fire and burning during the stab test can be avoided.

[0018] Other features and advantages of the present disclosure will become apparent from the following detailed description of illustrative embodiments of the present disclosure, which proceeds with reference to the accompanying drawings.

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the disclosure. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a schematic structural diagram of a module according to the prior art from one perspective; [Figure 2] FIG. 2 is a schematic structural diagram of a conventional module from another perspective. [Figure 3] FIG. 2 is a partially exploded view from one perspective of a battery module according to one embodiment of the present disclosure. [Figure 4] FIG. 10 is a schematic diagram of the assembly of a second battery core and a second composite layer of a battery module according to one embodiment of the present disclosure. [Figure 5] FIG. 10 is a schematic diagram of the assembly of a second battery core and a second composite layer of a battery module according to one embodiment of the present disclosure. [Figure 6] FIG. 2 is a partially exploded view of a battery module according to an embodiment of the present disclosure from another perspective. [Figure 7] FIG. 2 is a schematic diagram of an assembly of a second insulating member, a first metal member, and a first insulating layer of a battery module according to one embodiment of the present disclosure. [Figure 8] FIG. 2 is a schematic diagram of the assembly of a second insulating member, a second metal member, and a second insulating layer of a battery module according to one embodiment of the present disclosure. [Figure 9] FIG. 2 is a schematic diagram of the assembly of the main body and electrical connection pieces of a battery module according to one embodiment of the present disclosure. [Figure 10] FIG. 2 is a partially exploded view of a battery module according to another embodiment of the present disclosure. [Figure 11] FIG. 2 is a partially exploded view of a battery module according to another embodiment of the present disclosure. [Figure 12] FIG. 2 is a partially exploded view of a battery module according to another embodiment of the present disclosure. [Figure 13] FIG. 2 is a partially exploded view of a battery module according to another embodiment of the present disclosure. [Figure 14] FIG. 1 is a schematic diagram of a circuit formed in a battery module according to one embodiment of the present disclosure during a needle stick test. [Figure 15] FIG. 1 is a schematic diagram of a circuit formed in a battery module according to one embodiment of the present disclosure during a needle stick test. [Figure 16] FIG. 1 is a schematic diagram of a circuit formed in a battery module according to one embodiment of the present disclosure during a needle stick test. [Figure 17] FIG. 1 is a schematic diagram of a circuit formed in a battery module according to one embodiment of the present disclosure during a needle stick test. [Figure 18] FIG. 1 is a schematic diagram of a circuit formed in a battery module according to one embodiment of the present disclosure during a needle stick test. [Figure 19] FIG. 1 is a schematic diagram of a battery module according to an embodiment of the present disclosure undergoing a needle stick test. DETAILED DESCRIPTION OF THE INVENTION

[0021] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specified, the relative arrangements, numerical expressions, and values ​​of components and steps described in the embodiments do not limit the scope of the present disclosure.

[0022] Indeed, the following description of at least one exemplary embodiment is intended to be merely illustrative and is in no way intended to limit the disclosure and its applications or uses.

[0023] Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, those techniques, methods, and devices shall be considered part of this specification.

[0024] In all examples shown and discussed herein, any particular values ​​should be construed as examples only and not as limitations, and thus other examples of exemplary embodiments may have different values.

[0025] It should be noted that like reference signs or characters in the accompanying drawings indicate like items, and therefore, once an item is defined in one accompanying drawing, that item need not be further discussed in subsequent accompanying drawings.

[0026] The present disclosure is an invention made by the inventor based on the following facts.

[0027] 1 and 2 show the overall structure of a battery module of the prior art.

[0028] Figure 1 shows a blade-shaped module structure in the prior art. The module has a positive electrode and a negative electrode on the same side and is a U-shaped serial structure. As shown in Figure 2, the U-shaped structure has a U-shaped safety structure 3 at the tail. In this case, needle Steel during stab test needleenters battery 1 and continues forward, penetrating battery 2. needle In the process of penetrating battery 1, needle connects the positive and negative pole pieces in the battery 1. needle The positive and negative pole pieces and the steel needle There is a huge current between the steel needle Melt the positive and negative pieces around the steel. needle At the exact moment when the current penetrates battery 1 and penetrates battery 2, the potential difference between battery 1 and battery 2 causes the steel needle An arc is generated between the battery and battery 2. needle continues to penetrate into Battery 2. Both the positive and negative pieces of Battery 1 are steel. needle The steel is ablated at the periphery where it is in contact with the needle The contact resistance between the positive and negative electrodes of Battery 1 and the steel increases. needle , battery 2, another battery, and a safety structure circuit The large resistance of the battery leads to prolonged arcing, which is unlikely to cause a rapid blowing of the safety structure. The sustained arcing melts the aluminum shell, allowing air to enter the module cavity and ignite the electrolyte in the battery, resulting in a fire.

[0029] Based on this, the inventors of the present disclosure have inventively achieved the following inventions after long-term research and experimentation.

[0030] A battery module 100 according to one embodiment of the present disclosure will be described below with reference to the accompanying drawings.

[0031] As shown in FIGS. 3 to 13, a battery module 100 according to this embodiment of the present disclosure includes a plurality of battery cores, a protection assembly, and protection components.

[0032] Specifically, the multiple battery cores are connected in series. The multiple battery cores include a first battery core group and a second battery core group arranged opposite each other. At least one of the battery cores is provided in each of the first and second battery core groups. A protection assembly is arranged between the first and second battery core groups. The protection assembly includes a stacked first metal member 31, a first insulating member, and a second metal member 41. The first metal member 31 is arranged opposite at least one of the battery cores in the first battery core group, and the second metal member 41 is arranged opposite at least one of the battery cores in the second battery core group. A protection component 20 is arranged between two of the adjacent battery cores. The protection component 20 is capable of interrupting a circuit.

[0033] Test Steel needle 200 is attached to the first metal member 31 in the first battery core group Relative When the battery core, the first metal member 31, the first insulating member, and the second metal member 41 are passed through in this order, the battery module 100 circuit is formed. Test steel needle 200 is connected to the second metal member 41 in the second battery core group Relative If the battery core is penetrated, it may cause a short circuit in the battery module 100. circuit will be added.

[0034] In other words, the battery module 100 according to this embodiment of the present disclosure mainly includes a plurality of battery cores, a protection assembly, and a protection component. The plurality of battery cores are connected in series. It should be noted that the battery module 100 according to this embodiment of the present disclosure may be a series-connected circuit as a whole, or a series-and-parallel-connected circuit. In some cases, the first battery core in the plurality of battery cores may be electrically connected to the common positive electrode of the battery module 100, and the last battery core in the plurality of battery cores may be electrically connected to the common negative electrode of the battery module 100. In other words, the plurality of battery cores connected in series may form a battery core string. In some cases, the common positive electrode and the common negative electrode of the battery module 100 may be arranged on the same side. In some cases, the battery module 100 may have a substantially U-shaped series-connected structure.

[0035] The battery core string includes a first battery core group and a second battery core group arranged opposite each other. In other words, the first battery core group includes at least one battery core, and the second battery core group also includes at least one battery core. For ease of explanation, one battery core in the first battery core group is defined as the first battery core 11, and one battery core in the second battery core group is defined as the second battery core 12. The first battery core 11 and the second battery core 12 are arranged opposite each other. For example, the first battery core 11 and the second battery core 12 extend horizontally, and the second battery core 12 is arranged above or below the first battery core 11.

[0036] It should be noted that the first battery core group includes at least one battery core, and the second battery core group includes at least one battery core. A protection assembly is disposed between the first battery core group and the second battery core group. The location of the protection assembly will be described below by using an example.

[0037] Case 1 6, the first battery core group includes four battery cores, and the second battery core group includes four battery cores. The first battery core 11 of the first battery core group is connected to the common positive terminal, and the second battery core 12 is connected to the common negative terminal. In this case, the protection assembly is disposed between the first battery core 11 and the second battery core 12, and the protection assembly does not extend beyond the first battery core 11 and the second battery core 12.

[0038] Case 2 As shown in FIG. 10, the first battery core group includes four battery cores, and the second battery core group includes four battery cores. For ease of explanation, the battery core string is divided into battery core 1#, battery core 2#, battery core 3#, battery core 4#, battery core 5#, battery core 6#, battery core 7#, and battery core 8#. The first battery core group includes battery core 1#, battery core 2#, battery core 3#, and battery core 4#. The second battery core group includes battery core 5#, battery core 6#, battery core 7#, and battery core 8#. Battery core 1# is connected to the common positive terminal, and battery core 8# is connected to the common negative terminal. Battery core 2# and battery core 7# are arranged opposite each other. Battery core 3# and battery core 6# are arranged opposite each other. Battery core 4# and battery core 5# are arranged opposite each other. One side of the protection assembly is positioned opposite battery core #2, and the other side of the protection assembly is positioned opposite battery core #7.

[0039] Case 3 As shown in FIG. 11, the first battery core group includes four battery cores, and the second battery core group includes four battery cores. For ease of explanation, the battery core string is divided into battery core 1#, battery core 2#, battery core 3#, battery core 4#, battery core 5#, battery core 6#, battery core 7#, and battery core 8#. The first battery core group includes battery core 1#, battery core 2#, battery core 3#, and battery core 4#. The second battery core group includes battery core 5#, battery core 6#, battery core 7#, and battery core 8#. Battery core 1# is connected to the common positive terminal, and battery core 8# is connected to the common negative terminal. Battery core 2# and battery core 7# are arranged opposite each other. Battery core 3# and battery core 6# are arranged opposite each other. Battery core 4# and battery core 5# are arranged opposite each other. One side of the protection assembly is disposed opposite battery core 3#, and the other side of the protection assembly is disposed opposite battery core 6#.

[0040] Case 4 As shown in FIG. 12, the first battery core group includes four battery cores, and the second battery core group includes four battery cores. For ease of explanation, the battery core string is divided into battery core 1#, battery core 2#, battery core 3#, battery core 4#, battery core 5#, battery core 6#, battery core 7#, and battery core 8#. The first battery core group includes battery core 1#, battery core 2#, battery core 3#, and battery core 4#. The second battery core group includes battery core 5#, battery core 6#, battery core 7#, and battery core 8#. Battery core 1# is connected to the common positive terminal, and battery core 8# is connected to the common negative terminal. Battery core 2# and battery core 7# are arranged opposite each other. Battery core 3# and battery core 6# are arranged opposite each other. Battery core 4# and battery core 5# are arranged opposite each other. One side of the protection assembly faces both battery core 2# and battery core 3#, and the other side of the protection assembly faces both battery core 7# and battery core 6#.

[0041] Case 5 As shown in FIG. 13, the first battery core group includes four battery cores, and the second battery core group includes four battery cores. For ease of explanation, the battery core string is divided into battery core 1#, battery core 2#, battery core 3#, battery core 4#, battery core 5#, battery core 6#, battery core 7#, and battery core 8#. The first battery core group includes battery core 1#, battery core 2#, battery core 3#, and battery core 4#. The second battery core group includes battery core 5#, battery core 6#, battery core 7#, and battery core 8#. Battery core 1# is connected to the common positive terminal, and battery core 8# is connected to the common negative terminal. Battery core 2# and battery core 7# are arranged opposite each other. Battery core 3# and battery core 6# are arranged opposite each other. Battery core 4# and battery core 5# are arranged opposite each other. One side of the protection assembly faces all of battery core 1#, battery core 2#, battery core 3#, and battery core 4#, and the other side of the protection assembly faces all of battery core 8#, battery core 7#, battery core 6#, and battery core 5#.

[0042] The first metal member 31, the first insulating member, and the second metal member 41 may be disposed between the first battery core 11 and the second battery core 12. The first metal member 31, the first insulating member, and the second metal member 41 are stacked. For example, the second battery core 12, the second metal member 41, the first insulating member, the first metal member 31, and the first battery core 11 are sequentially distributed from the bottom to the top.

[0043] The first metal member 31 is disposed opposite the first battery core 11, and the second metal member 41 is disposed opposite the second battery core 12. It should be noted that the first metal member 31 may be connected to a terminal of the first battery core 11 or to a terminal of a battery core adjacent to the first battery core 11, etc., and the second metal member 41 may also be connected to a terminal of the second battery core 12 or to a terminal of a battery core adjacent to the second battery core 12, etc. needle Test steel during puncture test needle When the battery module 100 is penetrated by the first battery core 11 and the protection assembly, circuit The test steel is needle If 200 continues to penetrate into the second battery core 12, a short circuit will occur in the battery module 100. circuit is added, which falls within the protection scope of the present disclosure.

[0044] Furthermore, a protection component 20 is disposed between two adjacent battery cores in the plurality of battery cores. The protection component 20 can interrupt a circuit when a condition is met. For example, a short circuit occurs. circuit When is added, circuit The resistance value of the protective component 20 decreases, and the voltage remains unchanged. According to Ohm's law: I=U / R, the current increases so that the protective component 20 may be destroyed, thereby interrupting the circuit of the battery core string. A fuse or a protective structure formed by a circuit structure of the circuit can be selected as the protective component 20 according to the actual usage situation. The protective component 20 of this structure can be configured to enhance the use safety of the battery module 100 by providing battery overcurrent protection. For example, a fuse or an overcurrent structural member with a small cross-sectional area can be selected as the protective component 20. Test Steel needle 200 penetrates the first battery core 11 upwards first, then continues forward and penetrates the first metal member 31 up to the second metal member 41. In this case, the test steel needle The high temperature on 200 melts the first insulating member between the first metal member 31 and the second metal member 41, thereby increasing the contact area between the first metal member 31 and the second metal member 41, and the pre-existing insulating member between the first battery core 11, the first metal member 31, the second metal member 41, the protective component 20, etc. circuit is formed. Test steel needle When 200 continues to advance and penetrates into the second battery core 12, a short circuit occurs between the second battery core 12, the first metal member 31, the second metal member 41, the protection component 20, etc. circuit According to Ohm's law: I=U / R, the current must be large enough to ensure that the fuse can blow quickly. needleThe puncture will not cause a fire or explosion. The battery core in this disclosure may be a ternary battery, such as a lithium iron phosphate battery or a lithium manganese oxide battery.

[0045] Therefore, in the battery module 100 according to this embodiment of the present disclosure, the protection assembly is disposed between the first and second battery core groups that are arranged opposite to each other. When multiple battery cores are connected in series, for example, when the number of battery cores connected in series is three or more, needle During the stab test, cooperation between the protection assembly and the protective component ensures that the circuit is interrupted in time, thereby avoiding arcing, fire and combustion.

[0046] According to one embodiment of the present disclosure, as shown in Figures 3, 7, and 8, the first insulating member includes a first insulating layer 32 and a second insulating layer 42, and the protection assembly includes a first composite layer 30 and a second composite layer 40. The first composite layer 30 includes a first insulating layer 32 and a first metallic member 31, and the second composite layer 40 includes a second insulating layer 42 and a second metallic member 41. That is, the first composite layer 30 includes the first insulating layer 32 and the first metallic member 31. Specifically, the first composite layer 30 may include the first insulating layer 32 and the first metallic member 31, or may include another structure, such as a second insulating member 50. When the first composite layer 30 includes the first insulating layer 32 and the first metal member 31, and when the outer periphery of the first battery core 11 is wrapped with an insulating protective layer, the upper surface of the first battery core 11 is insulated from the first metal member 31. Similarly, when the outer periphery of the second battery core 12 is wrapped with an insulating protective layer, the lower surface of the second battery core 12 is also insulated from the second metal member 41. Details will not be described again here.

[0047] In some specific embodiments of the present disclosure, as shown in FIGS. 7 and 8 , the protection assembly further includes a second insulating member 50. The second insulating member 50 is disposed between the first battery core group and the first metal member 31 and / or between the second battery core group and the second metal member 41. When an insulating protective layer is provided on the outer surface of the battery core, the battery core is a pouch battery core. Based on this, disposing the second insulating member 50 between the first battery core 11 and the first metal member 31 can strengthen the insulation between the first battery core 11 and the first metal member 31 and prevent the insulation between the first battery core 11 and the first metal member 31 from failing due to burrs on the outer surface of the first battery core 11. Similarly, disposing the second insulating member 50 between the second battery core 12 and the second metal member 41 can also improve the reliability of the insulation between the second battery core 12 and the second metal member 41. Details will not be described again here. When the outer surface of the battery core is a metal shell, the second insulating member 50 can be disposed to ensure that the outer surface of the battery core is insulated from the corresponding first metal member 31 or second metal member 41.

[0048] According to one embodiment of the present disclosure, the protection component 20 is a fuse, which can generate heat or even blow when the circuit is overcurrent, and has the advantage of high sensitivity.

[0049] In some specific embodiments of the present disclosure, the first metal member 31 and the second metal member 41 are each connected to a terminal of a corresponding battery core. Specifically, the first metal member 31 is connected to a terminal of the first battery core 11, and the second metal member 41 is connected to a terminal of the second battery core 12. Along the direction from the first battery core 11 to the second battery core 12, the terminal of the first battery core 11 is arranged opposite the terminal of the second battery core 12. In other words, the terminal of the first core 11 connected to the first metal member 31 and the terminal of the second battery core 12 connected to the second metal member 41 are arranged opposite each other.

[0050] According to one embodiment of the present disclosure, the first metal member 31 and the second metal member 41 are each an elongated sheet-shaped body. By adopting a sheet-shaped structure, the structural thickness along the direction from the first battery core 11 to the second battery core 12 can be reduced. needle The ends of the sheet form along its length are connected to the terminals of the battery core so that they can be prevented from interfering with the puncture test. needle Short circuit to ensure fuse blows during stab test circuit It should be noted that if is added, the sheet-form body may be connected to the left terminal of the battery core or may be connected to the right terminal of the battery core.

[0051] According to one embodiment of the present disclosure, the position at which the sheet shape body is connected to the battery core in the corresponding first or second battery core group is adjustable, that is, the sheet shape body can be selectively connected to the left or right terminal of the battery core or the terminal of another battery core according to a specific situation.

[0052] In some specific embodiments of the present disclosure, as shown in Figures 7 to 9, the sheet-shaped body includes a main body 61 and an electrical connection piece 62. That is, the sheet-shaped body includes a welding piece and an electrical connection piece 62. needle The welding piece is an electrical connection piece 62, and needle The sting piece is the body 61. The welding piece can be connected to the terminal of the corresponding battery core. The body 61 is an elongated sheet-shaped body, which is made of test steel. needle200 not only helps the wire 200 penetrate the body 61 but also makes it easier to sandwich the body 61 between the first battery core 11 and the second battery core 12, thereby reducing the thickness in the direction from the first battery core 11 to the second battery core 12. The electrical connection piece 62 is disposed at one end of the body 61 along the length direction. The length of the electrical connection piece 62 is smaller than the width of the body 61. For example, the electrical connection piece 62 is disposed at a central position of the body 61 along the width direction to make it easier to connect the electrical connection piece 62 to a terminal. The electrical connection piece 62 is a bent member, and using the bent electrical connection piece 62 helps to connect the electrical connection piece 62 to a corresponding terminal.

[0053] According to one embodiment of the present disclosure, as shown in FIG. 6 , the number of battery cores in the first battery core group is equal to the number of battery cores in the second battery core group. That is, the total number of battery cores is an even number. Using an even number of battery cores makes it easier to fold the battery module 100 into a U-shaped structure, thereby improving the capacity of the battery cores within the battery shell. When the total number of battery cores is an even number, there is an advantage in saving space compared to a solution with an odd number of battery cores. It should be noted that the battery module of the present disclosure can also be used with a solution with an odd number of battery cores, but the resulting structure is complex.

[0054] The present disclosure relates to a battery module 100 needle stab protection A method is further provided. The battery module 100 is the battery module 100 according to any one of the previous embodiments. needle stab protection The method includes the following steps.

[0055] Test Steel needle 200 is attached to the first metal member 31 in the first battery core group Relative When the wire penetrates through the battery core, the first metal member 31, and the first insulating member to the second metal member 41, circuit is formed.

[0056] Test Steel needle 200 is connected to the second metal member 41 in the second battery core group Relative If the battery core is penetrated, it may cause a short circuit in the battery module 100. circuit will be added.

[0057] For example, test steel needle When the protective component 200 penetrates the first battery core 11, the first metal member 31, and the first insulating member to the second metal member 41, the protective component 20 circuit Test steel needle 200 continues to penetrate the second battery core 12, the protection component 20 circuit Located within the second circuit The resistance value of the first circuit , resulting in a circuit interruption through the protection component 20.

[0058] In other words, circuit After the current is added, the resistance value decreases and the voltage does not change. According to Ohm's law: I=U / R, the current is of a magnitude that ensures that the protection component 20 can quickly interrupt the circuit, e.g., blow quickly, so that needle This prevents fire or explosion during insertion. needle It should be noted that the fuse will likely blow when 200 penetrates the first battery core 11, the first metal member 31, and the first insulating member to the second metal member 41. If the fuse does not blow, the test steel needle If 200 continues to penetrate into the second battery core 12, the fuse will blow, causing a short circuit. circuit This can be ensured by adding

[0059] For the battery module 100 according to this embodiment of the present disclosure needle stab protection The principles of the method are explained in detail below with reference to specific embodiments.

[0060] As shown in FIG. 6 , the battery module 100 includes eight battery cores connected in series. For ease of explanation, the eight battery cores are divided into 1#, 2#, 3#, 4#, 5#, 6#, 7#, and 8#. The outer periphery of each battery core is wrapped with an insulating protective layer. In other words, the battery cores are pouch battery cores. The common positive and negative electrodes of the battery module 100 are arranged on the same side of the battery module 100. The left end of battery core 1# is connected to the common positive electrode, and the left end of battery core 8# is connected to the common negative electrode. Battery core 1# is arranged above battery core 8#, battery core 2# is arranged above battery core 7#, battery core 3# is arranged above battery core 6#, and battery core 4# is arranged above battery core 5#. A fuse is arranged between battery cores 4# and 5# as a protection component 20. For appearance and space saving, the fuse is configured as a U-shaped safety structure. That is, the U-shaped safety structure is disposed at the structural tail of the U-shaped battery module 100 . [Example]

[0061] Battery core #1 is the first battery core 11, and battery core #8 is the second battery core 12. A first composite layer 30 is disposed below battery core 1#. The first composite layer 30 includes, from bottom to top, a second insulating member 50, a first metal member 31, and a first insulating layer 32. A second composite layer 40 is disposed below the first composite layer 30. The second composite layer 40 includes, from bottom to top, a second insulating layer 42, a second metal member 41, and a second insulating member 50. An electrical connection piece 62 of the first metal member 31 is connected to a terminal on the side of battery core 1# closer to battery core 2#, and an electrical connection piece 62 of the second metal member 41 is connected to a terminal on the side of battery core 8# closer to battery core 7#. For ease of explanation, the first composite layer 30 including the second insulating member 50, the first metal member 31, and the first insulating layer 32 is referred to as a needle The second composite layer 40, defined as a pierced sheet a and including a second insulating layer 42, a second metal member 41, and a second insulating member 50, is needle It is defined as stab sheet b.

[0062] needle Puncture test, steel needle penetrates battery core 1# from its center. If the center of battery core 1# is used as the boundary line, the portion of battery core 1# closer to battery core 2# is A1, and the portion of battery core 1# closer to the common positive electrode is A2. Similarly, if the center of battery core 8# is used as the boundary line, the portion of battery core 8# closer to battery core 2# is C1, and the portion of battery core 8# closer to the common positive electrode is C2.

[0063] steel needle penetrates the battery core 1# from the top to the bottom, and continues to move downward, penetrating the first metal member 31 to the second metal member 41. needle The high temperature melts the first insulating layer 32 and the second insulating layer 42 between the first metal member 31 and the second metal member 41. In this case, the contact area between the first metal member 31 and the second metal member 41 increases. circuit are formed, and they are specifically shown in FIG. circuit 1, that is, the right terminal -ba of a-A1-2#...-7#-8# and the terminal -ba shown in FIG. circuit 2, that is, the right terminal of battery core 1# - 2#... the right terminal of battery core 8# - ba, circuit 2 corresponds to short-circuiting battery core 2# and battery core 7# from the outside. In this case, there are two situations: the fuse blows or the fuse does not blow. For example, as shown in Figure 19, using the first battery core 11 as an example for explanation, the left terminal of the first battery core 11 is A and the right terminal of the first battery core 11 is B. A is aluminum foil and B is copper foil, and there is a film for insulation between them. Test steel needle When 200 penetrates the first battery core 11, A and B are needle are connected by. circuit exists and this circuit So, the current flows through a to B, then through the steel needle It flows through to B and then to battery core 2#.

[0064] If the fuse doesn't blow, steel needle continues to move downward and penetrates battery core 8#, circuit are formed, and they are specifically shown in FIG. circuit 1, i.e., the right terminal of a-A1-2#...7#-8# - ba, as shown in Figure 17 circuit 2, that is, the right terminal of 1#-2#...7#-8#-ba, and ...7#-8#-ba, as shown in FIG. circuit 3, that is, the right terminal of 1#-2#...7#-C1-ba, where circuit When 2 blows the fuse, circuit 3 does not exist.

[0065] Considering the above, steel needle If it penetrates into the battery core 8#, it will cause a short circuit in the battery core string. circuit is added, circuit The resistance of the fuse decreases and the voltage remains unchanged. According to Ohm's law: I=U / R, the current is large enough to ensure that the fuse can blow quickly, thereby needle Fire or explosion during stabbing is prevented.

[0066] In conclusion, according to the battery module 100 of the embodiment of the present disclosure, by disposing the protection assembly between the two battery cores disposed opposite to each other, needle Puncture test, steel needle If 200 penetrates the battery core and the fuse does not blow, needle Short circuit when 200 continues to penetrate another battery core circuit By adding the fuse, the fuse can be guaranteed to blow, thereby significantly improving the safety performance of the battery module 100.

[0067] The present disclosure further provides a vehicle including a battery module 100 according to any one of the aforementioned embodiments. needle The vehicle of the present disclosure also has the same advantages, as it avoids severe arcing, fire and burning during the stab test and has high safety performance, and the details will not be described again here.

[0068] While several specific embodiments of the present disclosure have been described in detail by way of example, those skilled in the art should understand that the foregoing examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art should recognize that modifications can be made to the foregoing embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is limited only by the appended claims. [Explanation of symbols]

[0069] 100 battery modules 11 First battery core 12 Second battery core 20 Protection Components 30 First composite layer 31 First metal member 32 first insulating layer 40 Second composite layer 41 Second metal member 42 Second insulating layer 50 Second insulating member 61 Main Unit 62 Electrical connection piece 200 Test Steel needle 1 battery 2 batteries 3 Safety structure

Claims

1. a plurality of battery cores including a first battery core group and a second battery core group connected in series and arranged opposite each other, wherein at least one of the battery cores is provided in each of the first battery core group and the second battery core group; a protection assembly disposed between the first battery core group and the second battery core group, the protection assembly comprising a stacked first metal member, a first insulating member, and a second metal member, the first metal member being disposed opposite at least one of the battery cores in the first battery core group, and the second metal member being disposed opposite at least one of the battery cores in the second battery core group; a protection component disposed between two of the adjacently disposed battery cores and configured to interrupt a circuit; A battery module comprising: When a steel test needle passes through the battery core facing the first metal member in the first battery core group, the first metal member, the first insulating member, and the second metal member in that order, a circuit is formed in the battery module; When the steel test needle penetrates the battery core opposite the second metal member in the second battery core group, a short circuit is added to the battery module.

2. 2. The battery module of claim 1, wherein the first insulating member comprises a first insulating layer and a second insulating layer, the protection assembly comprises a first composite layer and a second composite layer, the first composite layer comprises the first insulating layer and the first metal member, and the second composite layer comprises the second insulating layer and the second metal member.

3. The protection assembly comprises: a second insulating member disposed between the first battery core group and the first metal member and / or between the second battery core group and the second metal member; The battery module of claim 1 further comprising:

4. The battery module according to claim 1 , wherein the protection component is a fuse.

5. 4. The battery module according to claim 1, wherein the first metal member and the second metal member are each an elongated sheet-shaped body, and ends of the sheet-shaped body along its length are connected to terminals of the battery core.

6. The battery module according to claim 5 , wherein the position at which the sheet-shaped body is connected to the battery core in the corresponding first battery core group or the corresponding second battery core group is adjustable.

7. 6. The battery module according to claim 5, wherein the sheet-shaped body comprises a main body and an electrical connection piece, the main body has an elongated shape, the electrical connection piece is arranged at an end of the main body along the length direction, the length of the electrical connection piece is less than the width of the main body, and the electrical connection piece is a bent member.

8. The battery module according to claim 1 , wherein the number of the battery cores in the first battery core group is equal to the number of the battery cores in the second battery core group.

9. A needlestick protection method for a battery module, wherein the battery module is the battery module according to any one of claims 1 to 3, and the needlestick protection method includes the following steps: forming a circuit in the battery module when a steel test needle penetrates the battery core facing the first metal member in the first battery core group, the first metal member, and the first insulating member in order up to the second metal member; adding a short circuit to the battery module when the steel test needle penetrates the battery core opposite the second metal member in the second battery core group; 1. A needlestick protection method comprising:

10. A vehicle comprising the battery module according to any one of claims 1 to 3.

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