Blade battery

Abstract

The utility model relates to the technical field of batteries, in particular to a blade battery, which comprises a battery cell module, a plurality of battery cells and a plurality of battery cells, the partition longitudinal beams are arranged at the side parts of the battery cell modules; the partition longitudinal beam is provided with a partition part, and the partition part is divided into a pressure relief part and an electrical connection part; an anti-explosion valve and a collection assembly are arranged at one end of the battery cell, the anti-explosion valve is arranged towards the pressure relief part, and the electrical connection part is used for containing the collection assembly. According to the blade battery provided by the invention, the independent accommodating cavity is arranged for the acquisition assembly, the independent pressure relief part is arranged for the anti-explosion valve, and high-temperature airflow released when one or a part of battery cells are subjected to thermal runaway is limited in the pressure relief part and is released by the pressure relief part, so that mutual isolation between the anti-explosion valve and a high-voltage loop and a low-voltage loop of the acquisition assembly is realized; the influence of high-temperature airflow on the acquisition assembly is effectively avoided, so that short circuit, arc discharge and ignition of the whole pack are caused, secondary thermal runaway is caused, and the thermal runaway range of the battery pack is increased.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a blade battery. Background Art

[0002] At present, the existing blade batteries have cell explosion-proof valves that are grouped and arranged at multiple locations inside the package, and are not isolated from the high-voltage circuit and the low-voltage collection line. In the event of thermal runaway, this can easily cause high and low voltage insulation failure, resulting in a short circuit in the entire package, arcing and sparking, further aggravating the thermal runaway of the battery pack, which is more difficult to control. Utility Model Content

[0003] The purpose of the present application is to provide a blade battery so as to solve, to a certain extent, the technical problem that the existing blade batteries in the prior art are prone to high and low voltage insulation failure and cause short circuit of the entire pack when the explosion-proof valve of the thermal runaway battery cell releases pressure, thereby aggravating thermal runaway of the battery pack.

[0004] The present application provides a blade battery, comprising: a battery cell module, wherein the battery cell module comprises a plurality of battery cells;

[0005] A partition longitudinal beam, the partition longitudinal beam is arranged on the side of the battery core module; the partition longitudinal beam is provided with an isolation part, and the isolation part separates the pressure relief part and the electrical connection part;

[0006] An explosion-proof valve and a collection component are arranged at one end of the battery core, the explosion-proof valve is arranged toward the pressure relief portion, and the electrical connection portion is used to accommodate the collection component.

[0007] In the above technical solution, further, the battery cell module includes:

[0008] A first battery cell module, wherein the first battery cell module includes a plurality of first battery cells;

[0009] A second battery cell module, wherein the second battery cell module includes a plurality of second battery cells; each of the first battery cells and each of the second battery cells is provided with the explosion-proof valve and the collection component;

[0010] The wall surface of the first battery cell provided with the explosion-proof valve and the collection component and the wall surface of the second battery cell provided with the explosion-proof valve and the collection component are both arranged toward the partition longitudinal beam.

[0011] In any of the above technical solutions, further, the partition longitudinal beam is in a long strip shape, and the length of the partition longitudinal beam extends along the first direction;

[0012] A plurality of the first battery cells are sequentially arranged along the first direction on one side of the partition longitudinal beam; a plurality of the second battery cells are sequentially arranged along the first direction on the other side of the partition longitudinal beam.

[0013] In any of the above technical solutions, further, the partition longitudinal beam includes:

[0014] Beam body;

[0015] A first partition, the first partition is arranged on one side of the beam body, the first partition separates a first electrical connection part and a first pressure relief part, the explosion-proof valve of the first battery cell is arranged at the first pressure relief part, or the explosion-proof valve of the first battery cell is arranged toward the first pressure relief part; the collection component of the first battery cell is arranged in the first electrical connection part;

[0016] A second partition, the second partition is arranged on the other side of the beam body, the second partition separates a second pressure relief part and a second electrical connection part, the explosion-proof valve of the second battery cell is arranged in the second pressure relief part, or the explosion-proof valve of the second battery cell is arranged toward the second pressure relief part; the collection component of the second battery cell is arranged in the second electrical connection part.

[0017] In any of the above technical solutions, further, the partition longitudinal beam also includes:

[0018] a first bottom wall portion, the first bottom wall portion being disposed on one side of the beam body and being disposed below the first partition portion;

[0019] The second bottom wall portion is disposed on the other side of the beam body, and the second bottom wall portion is disposed below the second partition portion.

[0020] In any of the above technical solutions, further, the space between the first partition portion and the first bottom wall portion forms the first pressure relief portion;

[0021] The space between the second partition portion and the second bottom wall portion forms the second pressure relief portion.

[0022] In any of the above technical solutions, further, the blade battery also includes a box body, the battery cell module and the partition longitudinal beam are both arranged in the box body, and the end of the partition longitudinal beam is connected to the inner wall surface of the box body.

[0023] In any of the above technical solutions, further, a pressure relief valve is provided at a portion of the side wall of the box body corresponding to the first pressure relief portion and the second pressure relief portion.

[0024] In any of the above technical solutions, further, the blade battery also includes:

[0025] A first sealing member, wherein the first sealing member is disposed between the first partition and the first battery cell module;

[0026] A second sealing member is disposed between the second partition and the second battery cell module.

[0027] In any of the above technical solutions, further, the blade battery also includes:

[0028] A third sealing member, the third sealing member being disposed between the first bottom wall portion and the first battery cell module;

[0029] A fourth sealing member is disposed between the second bottom wall portion and the second battery cell module.

[0030] Compared with the prior art, the beneficial effects of this application are:

[0031] The blade battery provided in the present application includes: a battery cell module, the battery cell module includes multiple battery cells; a partitioning longitudinal beam, the partitioning longitudinal beam is arranged on the side of the battery cell module; the partitioning longitudinal beam is provided with an isolation part, the isolation part separates the pressure relief part and the electrical connection part; an explosion-proof valve and a collection component are provided at one end of the battery cell, the explosion-proof valve is arranged toward the pressure relief part, and the electrical connection part is used to accommodate the collection component.

[0032] The blade battery provided in the present application has an independent cavity for the collection component and an independent pressure relief part for the explosion-proof valve. When thermal runaway occurs in one or part of the battery cells, the released high-temperature airflow is limited to the pressure relief part and released through the pressure relief part, so that the high and low pressure circuits of the explosion-proof valve and the collection component are isolated from each other, and the high-temperature airflow is effectively prevented from affecting the collection component, thereby causing a short circuit of the entire package, arcing and sparking, causing secondary thermal runaway, and aggravating the thermal runaway range of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of the structure of a blade battery provided in an embodiment of the present application;

[0035] Figure 2 Another structural schematic diagram of a blade battery provided in an embodiment of the present application;

[0036] Figure 3 A schematic diagram of a partial structure of a blade battery provided in an embodiment of the present application;

[0037] Figure 4 A cross-sectional view of a blade battery provided in an embodiment of the present application from a frontal perspective;

[0038] Figure 5 A schematic diagram of the partial structure of the blade battery provided in an embodiment of the present application.

[0039] Reference numerals:

[0040] 1-first battery cell module, 101-first battery cell, 2-second battery cell module, 201-second battery cell, 3-partitioning longitudinal beam, 301-beam body, 302-first partition, 303-second partition, 304-first bottom wall, 305-second bottom wall, 306-first pressure relief part, 307-first electrical connection part, 308-second pressure relief part, 309-second electrical connection part, 4-explosion-proof valve, 5-collection component, 6-box, 601-first side wall, 602-second side wall, 7-pressure relief valve, 8-first seal, 9-second seal, 10-third seal, 11-fourth seal, a-first direction. DETAILED DESCRIPTION

[0041] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0042] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0043] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0044] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] Refer to the following Figures 1 to 5 A blade battery according to an embodiment of the present application is described.

[0047] See also Figures 1 to 5 As shown, an embodiment of the present application provides a blade battery, which includes: a battery cell module and a partition longitudinal beam 3, wherein the battery cell module includes a plurality of battery cells, and an explosion-proof valve 4 and a collection component 5 are provided at the end of each battery cell, wherein the collection component 5 includes a high-voltage conductive bar and a low-voltage collection FPC (Flexible Printed Circuit), and the partition longitudinal beam 3 is arranged on the side of the battery cell module, and the end face of each battery cell provided with the explosion-proof valve 4 and the collection component 5 is arranged toward the partition longitudinal beam 3. The separating longitudinal beam 3 is provided with an isolation part, which separates the pressure relief part and the electrical connection part which are spaced apart from each other and independently arranged. The explosion-proof valve 4 of each battery cell is arranged toward the pressure relief part. The collection component 5 of each battery cell is electrically connected to the output pole of the battery cell, and the collection component 5 is located in the electrical connection part. The electrical connection part provides sufficient safety space for the collection component 5, and the electrical connection part and the pressure relief part are not connected to each other. When a battery cell has thermal runaway and the explosion-proof valve 4 opens, the high-temperature airflow released through the explosion-proof valve 4 is released into the pressure relief part, and the high-temperature airflow generated when the battery cell has thermal runaway is controlled within the space defined by the pressure relief part, and is exhausted separately through the pressure relief part, thereby effectively avoiding the influence of the high-temperature airflow on the collection component 5 and other components of the battery, and significantly improving the safety of the blade battery.

[0048] Specifically, the battery cell module includes a first battery cell module 1 and a second battery cell module 2 which are arranged at intervals, wherein the first battery cell module 1 includes a plurality of first battery cells 101, and the plurality of first battery cells 101 are arranged sequentially along a first direction a. Preferably, the first battery cells 101 have a rectangular parallelepiped structure, and an explosion-proof valve 4 and a collection component 5 are provided on the end face of each first battery cell 101 facing the partition longitudinal beam 3. Figure 5 In the state shown, the collection component 5 is arranged at the upper half of the end surface of the first battery cell 101 , and the explosion-proof valve 4 is arranged at the lower half of the end surface of the first battery cell 101 .

[0049] The second cell module 2 includes a second cell 201, and a plurality of second cells 201 are arranged in sequence along the first direction a. The structure of the second cell 201 is the same as that of the first cell 101, and an explosion-proof valve 4 and a collection component 5 are provided on the end surface of each second cell 201 facing the partition longitudinal beam 3. The collection component 5 on the first cell 101 and the collection component 5 on the second cell 201 are both provided in the electrical connection part, and the explosion-proof valve 4 on the first cell 101 and the explosion-proof valve 4 on the second cell 201 are both provided toward the pressure relief part, or the explosion-proof valve 4 on the first cell 101 and the explosion-proof valve 4 on the second cell 201 are both located in the pressure relief part, so that the installation area of ​​the explosion-proof valve 4 and the collection component 5 is separated by providing the partition longitudinal beam 3, so as to avoid affecting the collection component 5 when the first cell 101 and / or the second cell 201 is depressurized.

[0050] Further, the partition longitudinal beam 3 includes a beam body 301, which is in the shape of a long strip, and the length of the beam body 301 extends along the first direction a. Preferably, the beam body 301 has a rectangular parallelepiped structure, and the two sides of the rectangular parallelepiped structure have the same area and the largest area, respectively, the first surface and the second surface. The surface of the first battery cell 101 provided with the explosion-proof valve 4 and the collection component 5 is arranged facing the first surface, and the surface of the second battery cell 201 provided with the explosion-proof valve 4 and the collection component 5 is arranged facing the second surface. Preferably, each first battery cell 101 is arranged perpendicular to the beam body 301, and the second battery cell 201 is the same. Preferably, the end surface of the first battery cell 101 is arranged at intervals from the first surface, and the end surface of the second battery cell 201 is arranged at intervals from the second surface.

[0051] Furthermore, the partition longitudinal beam 3 further includes a first partition 302 and a second partition 303, wherein the first partition 302 and the second partition 303 both have a rectangular flat plate structure, and the first partition 302 is arranged on the first surface, preferably, the first partition 302 is arranged at the middle height position of the beam body 301, and the length of the first partition 302 extends along the length direction of the beam body 301. The second partition 303 is arranged on the second surface of the beam body 301, and the specific arrangement method is the same as that of the first partition 302.

[0052] The partition longitudinal beam 3 also includes a first bottom wall portion 304 and a second bottom wall portion 305, wherein the first bottom wall portion 304 is arranged below the first partition portion 302, and the first bottom wall portion 304 also has a rectangular flat plate structure, the first bottom wall portion 304 is arranged parallel to the first partition portion 302, and the lower surface of the first bottom wall portion 304 is arranged flush with the bottom wall surface of the beam body 301, a first electrical connection portion 307 is formed above the first partition portion 302, and a first pressure relief portion 306 is formed below the first partition portion 302 and between the first bottom wall portion 304, and the collection component 5 on each first battery cell 101 is arranged opposite to the first electrical connection portion 307. Since the collection component 5 protrudes relative to the end face of the first battery cell 101 after the connection with the battery cell output pole is completed, the first electrical connection portion 307 provides sufficient accommodating space for the collection component 5, and the first partition portion 302 separates an independent first electrical connection portion 307 to protect the collection component 5. The explosion-proof valve 4 on each first battery cell 101 is arranged toward the first pressure relief portion 306. Preferably, the explosion-proof valve 4 protrudes relative to the end surface of the first battery cell 101, and the explosion-proof valve 4 is located in the first pressure relief portion 306, so that the high-temperature airflow released when the explosion-proof valve 4 is opened can be released into the first pressure relief portion 306.

[0053] Similarly, a second bottom wall portion 305 is provided on the second surface of the beam body 301. The second bottom wall portion 305 is provided in the same manner as the first bottom wall portion 304. A second electrical connection portion 309 is formed above the second partition portion 303, and a second pressure relief portion 308 is formed between the bottom of the second partition portion 303 and the second bottom wall portion 305. The collection component 5 on each second battery cell 201 is provided opposite to the second electrical connection portion 309, and the explosion-proof valve 4 on each second battery cell 201 is provided opposite to the second pressure relief portion 308.

[0054] Preferably, the beam body 301 , the first partition 302 , the second partition 303 , the first bottom wall 304 and the second bottom wall 305 have an integrated structure and are formed through integrated processing.

[0055] Furthermore, the blade battery also includes a box body 6, and the first battery cell module 1, the second battery cell module 2, and the partition longitudinal beam 3 are all arranged in the box body 6. Preferably, the partition longitudinal beam 3 is arranged in the middle position of the box body 6, and the partition longitudinal beam 3 separates the internal space of the box body 6 into a first cavity and a second cavity. The first battery cell module 1 is arranged in the first cavity, and the second battery cell module 2 is arranged in the second cavity.

[0056] Specifically, the box body 6 includes a bottom wall and side walls connected end to end in sequence, and four side walls are arranged on the bottom wall. Two of the four side walls of the box body 6 are a first side wall 601 and a second side wall 602, and the first side wall 601 and the second side wall 602 are arranged in parallel and spaced apart along the first direction a.

[0057] The box body 6 is provided with a pressure relief valve 7, and the number of the pressure relief valves 7 is multiple. Preferably, in the present embodiment, the number of the pressure relief valves 7 is four. A pressure relief valve 7 is provided on the first side wall 601 at a position facing the first pressure relief portion 306, and another pressure relief valve 7 is provided on the first side wall 601 at a position facing the second pressure relief portion 308; a pressure relief valve 7 is provided on the second side wall 602 at a position facing the first pressure relief portion, and another pressure relief valve 7 is provided on the second side wall 602 at a position facing the second pressure relief portion 308. The two end ports of the first pressure relief part 306 are respectively provided with pressure relief valves 7 at positions facing the side walls of the box body 6. The same is true for the second pressure relief part 308. When one or more of the first battery cells 101, or one or more of the second battery cells 201, experience thermal runaway, the high-temperature airflow is released to the first pressure relief part 306 or the second pressure relief part 308. The high-temperature airflow can open the pressure relief valve 7, thereby dissipating the heat and pressure outside the box body 6 to avoid heat accumulation, which may cause dangerous situations such as fire or even explosion of the blade battery.

[0058] Preferably, the partition longitudinal beam 3 and the box body 6 are integrally formed, one end of the partition longitudinal beam 3 is fixedly attached to the inner wall surface of the first side wall 601 , and the other end of the partition longitudinal beam 3 is fixedly attached to the inner wall surface of the second side wall 602 .

[0059] Furthermore, the blade battery also includes a first seal 8, which is arranged between the first partition 302 and the first battery cell module 1. The first seal 8 is elastic and is arranged between the first partition 302 and the first battery cell 101 in a slightly deformed state. The first seal 8 contacts the end face of each first battery cell 101, and the first battery cell 101 is located between the collection component 5 and the explosion-proof valve 4, thereby blocking the gap between each first battery cell 101 and the first partition 302, ensuring the sealing effect between the first partition 302 and each first battery cell 101, and then the separation effect between the collection component 5 and the explosion-proof valve 4, to avoid a small amount of hot air flow flowing into the first electrical connection after the explosion-proof valve 4 is opened.

[0060] The blade battery also includes a second sealant 9, which is disposed between the second partition 303 and the second battery cell module 2. The specific configuration and function thereof may refer to the first sealant 8 mentioned above, which can be fully understood by those skilled in the art and will not be elaborated here.

[0061] Furthermore, the blade battery also includes a third seal 10, which is arranged between the first bottom wall portion 304 and the first battery cell module 1. The end face of each first battery cell 101 is in contact with the second seal 9, thereby effectively sealing the gap between each first battery cell 101 and the first bottom wall portion 304 to avoid heat accumulation. The third seal 10 can also resist the first battery cell 101 to limit each first battery cell 101.

[0062] The blade battery also includes a fourth seal 11, which is arranged between the second bottom wall portion 305 and the second battery cell module 2. The specific arrangement and function of the fourth seal 11 can be referred to the above-mentioned third seal 10, which can be fully understood by those skilled in the art and will not be elaborated.

[0063] It should be noted that the first sealing member 8 , the second sealing member 9 , the third sealing member 10 and the fourth sealing member 11 may be common sealing members such as sealing strips and sealing rings.

[0064] To sum up, the blade battery provided by the present application has an independent cavity for the collection component and an independent pressure relief part for the explosion-proof valve. When thermal runaway occurs in one or part of the battery cells, the released high-temperature airflow is limited to the pressure relief part and released through the pressure relief part, so that the high and low pressure circuits of the explosion-proof valve and the collection component are isolated from each other, and the high-temperature airflow is effectively prevented from affecting the collection component, thereby causing a short circuit of the entire package, arcing and sparking, causing secondary thermal runaway, and aggravating the thermal runaway range of the battery pack.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A blade battery, characterized in that: include: A battery cell module, wherein the battery cell module comprises a plurality of battery cells; A partition longitudinal beam, the partition longitudinal beam being arranged at the side of the battery core module; the partition longitudinal beam being provided with an isolation portion, the isolation portion is arranged to separate the pressure relief portion and the electrical connection portion; An explosion-proof valve and a collection component are arranged at one end of the battery core, the explosion-proof valve is arranged toward the pressure relief portion, and the electrical connection portion is used to accommodate the collection component.

2. The blade battery according to claim 1, characterized in that: The battery module comprises: A first battery cell module, wherein the first battery cell module includes a plurality of first battery cells; A second battery cell module, wherein the second battery cell module includes a plurality of second battery cells; each of the first battery cells and each of the second battery cells is provided with the explosion-proof valve and the collection component; The wall surface of the first battery cell provided with the explosion-proof valve and the collection component and the wall surface of the second battery cell provided with the explosion-proof valve and the collection component are both arranged toward the partition longitudinal beam.

3. The blade battery according to claim 2, characterized in that: The partition longitudinal beam is in the shape of a long strip, and the length of the partition longitudinal beam extends along the first direction; A plurality of the first battery cells are sequentially arranged along the first direction on one side of the partition longitudinal beam; a plurality of the second battery cells are sequentially arranged along the first direction on the other side of the partition longitudinal beam.

4. The blade battery according to claim 2, characterized in that: The partition longitudinal beam comprises: Beam body; A first partition, the first partition is arranged on one side of the beam body, the first partition separates a first electrical connection part and a first pressure relief part, the explosion-proof valve of the first battery cell is arranged at the first pressure relief part, or the explosion-proof valve of the first battery cell is arranged toward the first pressure relief part; the collection component of the first battery cell is arranged in the first electrical connection part; A second partition, the second partition is arranged on the other side of the beam body, the second partition separates a second pressure relief part and a second electrical connection part, the explosion-proof valve of the second battery cell is arranged in the second pressure relief part, or the explosion-proof valve of the second battery cell is arranged toward the second pressure relief part; the collection component of the second battery cell is arranged in the second electrical connection part.

5. The blade battery according to claim 4, characterized in that: The partition longitudinal beam further comprises: a first bottom wall portion, the first bottom wall portion being disposed on one side of the beam body and being disposed below the first partition portion; The second bottom wall portion is disposed on the other side of the beam body, and the second bottom wall portion is disposed below the second partition portion.

6. The blade battery according to claim 5, characterized in that: The space between the first partition portion and the first bottom wall portion forms the first pressure relief portion; The space between the second partition portion and the second bottom wall portion forms the second pressure relief portion.

7. The blade battery according to claim 4, characterized in that: The blade battery also includes a box body, the battery cell module and the partition longitudinal beam are both arranged in the box body, and the end of the partition longitudinal beam is connected to the inner wall surface of the box body.

8. The blade battery according to claim 7, characterized in that: A pressure relief valve is disposed on a portion of the side wall of the box body corresponding to the first pressure relief portion and the second pressure relief portion.

9. The blade battery according to claim 4, characterized in that: The blade battery also includes: A first sealing member, wherein the first sealing member is disposed between the first partition and the first battery cell module; A second sealing member is disposed between the second partition and the second battery cell module.

10. The blade battery according to claim 5, characterized in that: The blade battery also includes: A third sealing member, the third sealing member being disposed between the first bottom wall portion and the first battery cell module; A fourth sealing member is disposed between the second bottom wall portion and the second battery cell module.

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