Batteries, battery modules and electrical equipment

Abstract

The present application discloses a battery, a battery module and an electrical device, including a top cover sheet and a shell, wherein the top cover sheet includes: a liquid injection hole, the liquid injection hole passes through the top cover sheet; a sealing member, the sealing member is plugged into the liquid injection hole; a cap, the cap covers the sealing member, and the cap is connected to the top cover sheet. The battery of the present application seals and blocks the liquid injection hole with a sealing member, and then covers the sealing member with a cap, so that the liquid can be blocked when the battery leaks, and the liquid is prevented from flowing out of the liquid injection hole and contaminating the battery surface. The battery module provided by the present application includes at least two batteries, and a collection circuit, wherein the collection circuit is provided with at least one first input terminal and at least one second input terminal, the first input terminal is connected to the first pole and the second pole, and the second input terminal is connected to the shell. The present application collects the voltages on the battery pole and the shell respectively through the collection circuit, and judges in advance whether the battery is leaking according to the change in voltage. Avoid insulation failure caused by battery leakage.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of battery safety design, and in particular to a battery, a battery module and an electrical device. Background Art

[0002] Lithium batteries are the most important parts of electric vehicles. As electric vehicles become more popular, the market's requirements for the quality of lithium batteries are getting higher and higher. Currently, lithium batteries require higher energy density and faster charging capabilities. Correspondingly, the design of lithium batteries, modules and PACKs is becoming more and more extreme, and the requirements for the production process are also getting higher and higher.

[0003] In the production process of lithium batteries, it is inevitable that some defective products that do not meet the standards will be produced. For example, there is a micro-short circuit between the negative electrode and the shell of the battery cell. Generally, companies can screen such defective batteries through short-circuit tests, voltage drop tests and other means. However, even if the screening is comprehensive, it cannot guarantee that all defective batteries will be checked, and it is inevitable that a small number of defective batteries will flow into the market. During the use of the whole vehicle, as the car is constantly charged, discharged and vibrated, short circuits and electrochemical corrosion will form inside the battery cell, which will lead to leakage accidents and finally cause insulation failure of the whole vehicle. However, the current battery cell design cannot identify the electrochemical corrosion and leakage inside the battery cell in advance, and there are still potential risks during the use of the battery cell. Summary of the invention

[0004] The embodiments of the present application provide a battery, a battery module and an electrical device to solve the technical problem of electrochemical corrosion and leakage caused by internal short circuit of the battery in the prior art.

[0005] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0006] In a first aspect, a battery is provided, comprising a top cover sheet and a shell, wherein the shell is connected to the top cover sheet, and the top cover sheet comprises:

[0007] A liquid injection hole, the liquid injection hole passes through the top cover sheet;

[0008] A sealing member, the sealing member being inserted into the liquid injection hole;

[0009] A cap covers the sealing member and is connected to the top cover sheet.

[0010] In combination with the first aspect, the sealing element comprises:

[0011] A first sealing block;

[0012] a second sealing block, the second sealing block being connected to the first sealing block;

[0013] a third sealing block, the third sealing block being connected to the second sealing block;

[0014] The first sealing block, the second sealing block and the third sealing block are connected in sequence along a first direction X.

[0015] In combination with the first aspect, the injection hole includes a step hole and an inner hole, and the step hole surrounds the inner hole;

[0016] Wherein, the third sealing block seals the inner hole, the second sealing block is pressed against the step hole, and the first sealing block is pressed against the top cover sheet.

[0017] In combination with the first aspect, the cap includes a bottom plate and a ring plate, the ring plate surrounds the edge of the bottom plate, the ring plate protrudes along the first direction X, the ring plate and the bottom plate enclose a cavity, and the first sealing block is accommodated in the cavity.

[0018] In combination with the first aspect, the top cover sheet further includes a first pole, a second pole and an explosion-proof valve, wherein the first pole and the second pole are respectively arranged at two ends of the top cover sheet, and the explosion-proof valve is arranged between the first pole and the second pole;

[0019] Wherein, the injection hole is arranged between the first pole and the explosion-proof valve, or the injection hole is arranged between the second pole and the explosion-proof valve.

[0020] In a second aspect, a battery module is provided, comprising at least two batteries as described in any one of the first aspect, and

[0021] The acquisition circuit is provided with at least one first input terminal and at least one second input terminal, the first input terminal is connected to the first pole of one of the two adjacent batteries and the second pole of the other of the two adjacent batteries, and the second input terminal is connected to the shell.

[0022] In combination with the second aspect, it also includes a connecting plate, which covers the top cover plate, and the connecting plate connects the first pole of one of the two adjacent batteries and the second pole of the other of the two adjacent batteries, the first input end is connected to the connecting plate, and the second input end is connected to the shell through the cap.

[0023] In combination with the second aspect, the first input end and the second input end are arranged on the same side of the acquisition circuit, or the first input end and the second input end are arranged on both sides of the acquisition circuit;

[0024] And / or the connecting piece further includes a notch, the cap of one of the two adjacent batteries is exposed at the notch, and the second input end is connected to the cap.

[0025] In combination with the second aspect, the cap is made of metal.

[0026] In a third aspect, an electrical device is provided, comprising a battery as described in any one of the first aspect or a battery module as described in any one of the second aspect.

[0027] One of the above technical solutions has the following advantages or beneficial effects:

[0028] Compared with the prior art, the battery provided by the present application includes a top cover sheet and a shell, the shell is connected to the top cover sheet, and the top cover sheet includes: a liquid injection hole, the liquid injection hole passes through the top cover sheet; a sealing member, the sealing member is plugged into the liquid injection hole; a cap, the cap covers the sealing member, and the cap is connected to the top cover sheet. The battery of the present application seals the liquid injection hole with a sealing member, and then covers the sealing member with a cap, so that the liquid can be blocked when the battery leaks, preventing the liquid from flowing out of the liquid injection hole and contaminating the battery surface.

[0029] A battery module provided in the present application includes at least two batteries and a collection circuit, wherein the collection circuit is provided with at least one first input terminal and at least one second input terminal, wherein the first input terminal is connected to the first pole and the second pole, and the second input terminal is connected to the shell. The present application collects the voltage on the battery pole and the shell respectively through the collection circuit, and determines in advance whether the battery is leaking according to the change in voltage, thereby avoiding insulation failure caused by battery leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0031] Figure 1 A schematic diagram of a top cover sheet structure provided for an embodiment of the present application;

[0032] Figure 2 Provided for the embodiments of this application Figure 1 Schematic diagram of the structure along the AA section;

[0033] Figure 3 A schematic diagram of a top cover sheet structure provided for an embodiment of the present application;

[0034] Figure 4 Provided for the embodiments of this application Figure 1 Schematic diagram of the structure along the CC section;

[0035] Figure 5 For the embodiment of this application Figure 2 A local enlarged structural schematic diagram of point B is provided;

[0036] Figure 6A schematic diagram of a cross-sectional exploded structure of a cap and a seal provided in an embodiment of the present application;

[0037] Figure 7 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0038] Figure 8 A schematic diagram of the structure of a battery module provided in an embodiment of the present application;

[0039] Fig. 9 A schematic diagram of the structure of the connecting piece provided in the embodiment of the present application;

[0040] Fig.10 A schematic diagram of the structure of the acquisition circuit provided in an embodiment of the present application.

[0041] The reference numerals are as follows:

[0042] 1-cap, 101-bottom film, 102-ring piece, 103-cavity, 2-top cover piece, 3-liquid injection hole, 301-step hole, 302-inner hole, 4-first pole, 5-explosion-proof valve, 6-connecting piece, 601-notch, 7-collection circuit, 701-first input end, 702-second input end, 8-seal, 801-first sealing block, 802-second sealing block, 803-third sealing block, 9-shell, 10-second pole. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. is based on the orientation or position relationship shown in the drawings, which is 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 a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0044] The specific implementation methods of the present application are described below by way of examples:

[0045] See also Figures 1 to 6, an embodiment of the present application provides a battery, including a top cover sheet 2 and a shell 9, the shell 9 is connected to the top cover sheet 2, the top cover sheet 2 includes an injection hole 3, a seal 8 and a cap 1, the injection hole 3 passes through the top cover sheet 2; the seal 8 is plugged into the injection hole 3; the cap 1 covers the seal 8, and the cap 1 is connected to the top cover sheet 2. It can be understood that the injection hole 3 is used to inject electrolyte (lithium hexafluorophosphate, etc.) into the battery, and the electrolyte is injected into the battery according to the required amount. Usually, after the injection is completed, the injection hole 3 needs to be sealed by glue nails, etc. to prevent the injected electrolyte from absorbing moisture in the air and affecting the use of the battery. However, in some cases, when the battery has internal chemical corrosion, the seeping electrolyte may flow out through the gaps in the glue nails, thereby contaminating the surface of the battery. Therefore, in the present application, after the sealing member 8 seals and blocks the injection hole 3, the sealing member 8 is covered by the cap 1. Meanwhile, the cap 1 is made of aluminum, and the edge of the cap 1 is welded to the top cover sheet 2 to isolate the sealing member 8 and the injection hole 3 from the outside world, thereby preventing the electrolyte from leaking out of the battery.

[0046] See also Figure 6 In the embodiment of the present application, the sealing member 8 includes a first sealing block 801, a second sealing block 802 and a third sealing block 803, wherein the second sealing block 802 is connected to the first sealing block 801; the third sealing block 803 is connected to the second sealing block 802; wherein the first sealing block 801, the second sealing block 802 and the third sealing block 803 are sequentially connected along the first direction X. It can be imagined that the first sealing block 801 is cylindrical, the second sealing block 802 is truncated cone-shaped, and the third sealing block 803 is truncated cone-shaped, and the first sealing block 801, the second sealing block 802 and the third sealing block 803 are sequentially connected end to end, and the centers of the circles of the first sealing block 801, the second sealing block 802 and the third sealing block 803 coincide. Moreover, the cross-sectional area of ​​the second sealing block 802 is smaller than the cross-sectional area of ​​the first sealing block 801, and the cross-sectional area of ​​the third sealing block 803 is smaller than the cross-sectional area of ​​the second sealing block 802. It should be noted that the first sealing block 801, the second sealing block 802 and the third sealing block 803 are integrally formed by rubber materials, rather than being cut and then fixedly connected. It can be understood that the gap between the sealing members 8 can be reduced by the integrally formed structure, so that the injection hole 3 is more tightly sealed. In some embodiments, the first sealing block 801, the second sealing block 802 and the third sealing block 803 can be a cuboid or a cubic structure.

[0047] See also Figure 5In the embodiment of the present application, the injection hole 3 includes a step hole 301 and an inner hole 302, and the step hole 301 surrounds the inner hole 302; wherein the third sealing block 803 seals the inner hole 302, the second sealing block 802 presses the step hole 301, and the first sealing block 801 presses the top cover sheet 2. It can be understood that the inner hole 302 is connected to the inside of the battery, the step hole 301 surrounds the inner hole 302, and the edge of the step hole 301 is connected to the upper surface of the top cover sheet 2. When the sealing member 8 is connected to the injection hole 3, the third sealing block 803 is firstly contacted and connected with the inner hole 302. The outer diameter of the third sealing block 803 is slightly larger than the inner diameter of the inner hole 302. Since the third sealing block 803 is elastic, when the third sealing block 803 is connected to the inner hole 302, the third sealing block 803 can be squeezed into the inner hole 302 to form a sealed connection. The surface of the second sealing block 802 completely fits and covers the surface of the step hole 301, and the surface of the first sealing block 801 fits the surface of the top cover sheet 2, thereby forming layers of protection to prevent the electrolyte from leaking to the outside.

[0048] See also Figure 6 In the embodiment of the present application, the cap 1 includes a bottom film 101 and a ring piece 102, the ring piece 102 surrounds the edge of the bottom film 101, the ring piece 102 protrudes along the first direction X, the ring piece 102 and the bottom film 101 enclose a cavity 103, and the first sealing block 801 is accommodated in the cavity 103. It can be understood that the bottom film 101 is disc-shaped or cylindrical, the ring piece 102 surrounds the edge of the bottom film 101 and protrudes toward the first direction X to form a closed ring, and the bottom film 101 and the protruding ring piece 102 enclose a cavity 103, and the cavity 103 is provided with an opening along the first direction X; when the cap 1 moves in the first direction X, the cavity 103 covers the first sealing block 801. The bottom surface of the cavity 103 is in contact with the bottom surface of the first sealing block 801 , the side surface of the cavity 103 is in contact with the side surface of the first sealing block 801 , and the side of the ring sheet 102 away from the bottom sheet 101 is sealed and connected to the surface of the top cover sheet 2 by welding.

[0049] See also Figures 1 to 4In the embodiment of the present application, the top cover sheet 2 further includes a first pole 4, a second pole 10 and an explosion-proof valve 5, the first pole 4 and the second pole 10 are respectively arranged at the two ends of the top cover sheet 2, and the explosion-proof valve 5 is arranged between the first pole 4 and the second pole 10; wherein, the injection hole 3 is arranged between the first pole 4 and the explosion-proof valve 5, or the injection hole 3 is arranged between the second pole 10 and the explosion-proof valve 5. It can be understood that the first pole 4 is a positive pole, the second pole 10 is a negative pole, the positive pole and the negative pole are respectively arranged at the two ends of the top cover sheet 2, and the explosion-proof valve 5 is arranged in the middle position of the top cover sheet 2, that is, the explosion-proof valve 5 is arranged between the positive pole and the negative pole. In the embodiment of the present application, the injection hole 3 is arranged between the first pole 4 and the explosion-proof valve 5, and the position of the injection hole 3 is close to the side of the top cover sheet 2, that is, the center of the injection hole 3 is far away from the line connecting the center of the first pole 4 and the center of the explosion-proof valve 5. In some other embodiments, the injection hole 3 is disposed between the second pole 10 and the explosion-proof valve 5, and the center of the injection hole 3 is away from the line connecting the second pole 10 and the center of the explosion-proof valve.

[0050] See also Figures 8 to 10 In an embodiment of the present application, a battery module is provided, comprising at least two batteries as described above, and a collection circuit 7, wherein the collection circuit 7 is provided with at least one first input terminal 701 and at least one second input terminal 702, wherein the first input terminal 701 is connected to the first pole 4 and the second pole 10, and the second input terminal 702 is connected to the shell 9. It can be understood that the collection circuit 7 collects the voltage on the battery pole through the first input terminal 701, and collects the voltage on the shell 9 through the second input terminal 702, and inputs the two collected voltages into the battery management system, and the two voltages are judged by the battery management system. If the two voltages exceed a certain threshold after comparison, it is considered that the battery has a corrosion risk. It should be noted that the first input terminal 701 collects the voltage of the first pole 4 of the first battery and the second pole 10 of the second battery, and the second input terminal 702 collects the shell voltage of the first battery. The first battery and the second battery are arranged in parallel and in series with each other.

[0051] See also Figure 8 and Fig. 9In the embodiment of the present application, a connecting piece 6 is further provided. The connecting piece 6 covers the top cover piece 2. The first input end 701 is connected to the first pole 4 and the second pole 10 through the connecting piece 6, and the second input end 702 is connected to the housing 9 through the cap 1. It can be understood that after the connecting piece 6 covers the top cover piece 2, it is connected to the first pole 4 and the second pole 10 respectively. The first input end 701 is connected to the connecting piece 6 to achieve the connection with the first pole 4 and the second pole 10. The cap 1 is connected to the housing 9, and the second input end 702 is connected to the housing 9 through the cap 1. A notch 601 is provided on the connecting piece 6. When the connecting piece 6 covers the top cover piece 2 and is connected to the first pole 4 and the second pole 10, the notch 601 can expose the bottom of the cap 1 to facilitate the connection of the second input end 702 with the cap 1. The height of the cap 1 is the same as the height of the first pole 4 and the second pole 10, and the thickness of the bottom piece 101 of the cap 1 is greater than 1.5 mm. The cap 1 not only seals the injection hole 3 but also connects the second input terminal 702, thereby reducing the size of the second input terminal 702 of the acquisition circuit 7 and saving costs. It can be imagined that multiple groups of the first input terminal 701 and the second input terminal 702 can be set. When multiple batteries are staggered, the cooperation of multiple groups of the first input terminal 701 and the second input terminal 702 can realize sampling of multiple batteries in the battery module. Thereby judging the safety of the entire battery module. And the first input terminal 701 and the second input terminal 702 can be set on the same side of the acquisition circuit 7 for sampling or respectively set on both sides of the acquisition circuit 7. The specific direction design can be selected according to the actual situation of the battery module.

[0052] An embodiment of the present application also provides an electrical device, including a battery as described above or a battery module as described above.

[0053] The present application collects the voltages on different battery poles and the voltage on the housing 9 through the collection circuit 7, and makes a judgment based on the collected voltages to obtain the internal condition of the battery. When the voltage exceeds a certain threshold, it is judged that corrosion occurs inside the battery, thereby extracting an early warning, leaving sufficient time for the car to replace the corroded battery, thereby ensuring the safety of other batteries in the car.

[0054] The above is a detailed introduction to a battery, a battery module and an electrical device provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery module, characterized in that: include: At least two batteries, comprising a top cover sheet (2) and a shell (9), wherein the shell (9) is connected to the top cover sheet (2), and the top cover sheet (2) comprises: a liquid injection hole (3), wherein the liquid injection hole (3) passes through the top cover sheet (2); a sealing member (8), wherein the sealing member (8) is plugged into the liquid injection hole (3); and a cap (1), wherein the cap (1) covers the sealing member (8), and wherein the cap (1) is connected to the top cover sheet (2); The top cover sheet (2) further comprises a first pole (4) and a second pole (10), wherein the first pole (4) and the second pole (10) are respectively arranged at two ends of the top cover sheet (2); A collection circuit (7), the collection circuit (7) being provided with at least one first input terminal (701) and at least one second input terminal (702), the first input terminal (701) being connected to a first pole (4) of a first battery of two adjacent batteries and a second pole (10) of a second battery of two adjacent batteries, and the second input terminal (702) being connected to a housing (9) of the first battery; a connecting piece (6), the connecting piece (6) covering the top cover piece (2), the connecting piece (6) respectively connecting the first pole (4) of the first battery of two adjacent batteries and the second pole (10) of the second battery of two adjacent batteries, the first input end (701) connected to the connecting piece (6), and the second input end (702) connected to the housing (9) of the first battery through the cap (1); The first input end (701) and the second input end (702) are arranged on the same side of the acquisition circuit (7), or the first input end (701) and the second input end (702) are arranged on two sides of the acquisition circuit (7); The connecting piece (6) further comprises a notch (601), wherein the cap (1) of the first battery of two adjacent batteries is exposed at the notch (601), and the second input end (702) is connected to the cap (1).

2. The battery module according to claim 1, characterized in that: The sealing member (8) comprises: A first sealing block (801); a second sealing block (802), the second sealing block (802) being connected to the first sealing block (801); a third sealing block (803), the third sealing block (803) being connected to the second sealing block (802); Wherein, the first sealing block (801), the second sealing block (802) and the third sealing block (803) are connected in sequence along a first direction (X).

3. The battery module according to claim 2, characterized in that: The injection hole (3) comprises a stepped hole (301) and an inner hole (302), and the stepped hole (301) surrounds the inner hole (302); The third sealing block (803) seals the inner hole (302), the second sealing block (802) is pressed against the step hole (301), and the first sealing block (801) is pressed against the top cover sheet (2).

4. The battery module according to claim 2, characterized in that: The cap (1) comprises a bottom film (101) and a ring film (102), wherein the ring film (102) surrounds the edge of the bottom film (101), the ring film (102) protrudes along the first direction (X), the ring film (102) and the bottom film (101) enclose a cavity (103), and the first sealing block (801) is accommodated in the cavity (103).

5. The battery module according to claim 1, characterized in that: The top cover sheet (2) further comprises an explosion-proof valve (5), wherein the explosion-proof valve (5) is arranged between the first pole (4) and the second pole (10); The injection hole (3) is provided between the first pole (4) and the explosion-proof valve (5), or the injection hole (3) is provided between the second pole (10) and the explosion-proof valve (5).

6. The battery module according to claim 1, characterized in that: The cap (1) is made of metal.

7. An electrical equipment, characterized in that: Comprising a battery module as described in any one of claims 1 to 6.

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