Battery and vehicle

Abstract

The utility model provides a battery and a vehicle. The vehicle comprises a shell, an electrode assembly and a heating assembly, the top of the shell is provided with a positive pole and a negative pole, the electrode assembly is packaged in the shell, the electrode assembly comprises pole pieces and an isolating membrane, the pole pieces comprise a positive pole piece and a negative pole piece, the isolating membrane is located between the positive pole piece and the negative pole piece, the positive pole piece is electrically connected with the positive pole, and the negative pole piece is electrically connected with the negative pole; the heating assembly is arranged between the isolating membrane and the pole piece, the first end of the heating assembly is electrically connected with one of the positive pole and the negative pole, and the second end of the heating assembly is electrically connected with the inner wall of the shell; the shell and the heating assembly are both made of conductive materials. The connection mode of the heating assembly forms a good conductive connection structure, the appearance of the battery is lossless, the manufacturing and assembly of the battery are not influenced, and the problem of how to modify the battery to adapt to the thermal runaway research of the battery is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery test, specifically, relate to a kind of battery and vehicle. BACKGROUND

[0002] Battery thermal runaway is one of the important problems of battery safety, which refers to the temperature rise of battery due to internal or external factors during charging or discharging, thereby triggering a series of chain reactions, eventually leading to battery combustion or explosion. Internal short circuit of battery is the root cause of battery thermal runaway. How to effectively trigger internal short circuit of battery for battery thermal runaway related research and improvement is an important issue in the field of battery safety technology.

[0003] Currently, there are mainly two ways to trigger internal short circuit of battery: the first is through external heating, needle piercing, overcharging and other methods. This method does not require modification of the battery body, but due to the introduction of external heat source or physical device, it cannot truly simulate the internal short circuit of battery itself.

[0004] In view of the above problems, there is no effective solution at present. UTILITY MODEL CONTENT

[0005] The main purpose of the utility model is to provide a kind of battery and vehicle, to solve the problem of how to modify battery to adapt to battery thermal runaway research.

[0006] In order to achieve the above purpose, according to one aspect of the utility model, a battery is provided, comprising: a shell, the top of the shell is provided with a positive pole and a negative pole; an electrode assembly, the electrode assembly is packaged in the shell, the electrode assembly includes a tab and a separator, the tab includes a positive tab and a negative tab, the separator is located between the positive tab and the negative tab, the positive tab is electrically connected with the positive pole, and the negative tab is electrically connected with the negative pole; a heating assembly, the heating assembly is arranged between the separator and the tab, the first end of the heating assembly is electrically connected with one of the positive pole and the negative pole, and the second end of the heating assembly is electrically connected with the inner wall of the shell; wherein the shell and the heating assembly are made of conductive material.

[0007] Further, the heating assembly comprises: a heating resistor, the heating resistor is arranged between the separator and the tab; a first lead wire, the first lead wire is connected with the heating resistor, and the heating resistor is electrically connected with one of the positive pole and the negative pole through the first lead wire; a second lead wire, the second lead wire is connected with the heating resistor, and the heating resistor is electrically connected with the inner wall of the shell through the second lead wire.

[0008] Further, the surface of the heating resistor, the first lead wire and the second lead wire is sprayed or pasted with insulating material.

[0009] Further, the heating assembly comprises a conductive piece arranged between the isolation film and the pole piece, the conductive piece having a first pin and a second pin; and a heating resistor arranged in contact with the conductive piece, so that the heating resistor is located between the isolation film and the pole piece, the heating resistor being electrically connected to one of the positive pole and the negative pole through the first pin, and the heating resistor being electrically connected to the inner wall of the shell through the second pin.

[0010] Further, surfaces of the heating resistor and the conductive piece are sprayed or pasted with insulating materials.

[0011] Further, the conductive piece has a U-shaped structure or a rectangular structure.

[0012] Further, the heating resistor has a resistance greater than or equal to 50Ω.

[0013] Further, the heating resistor has a resistance less than or equal to 100Ω.

[0014] Further, the first end of the heating assembly is electrically connected to one of the positive pole and the negative pole through welding, and the second end of the heating assembly is electrically connected to the inner wall of the shell through welding.

[0015] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a vehicle is provided, the vehicle comprising a battery, the battery being the above-mentioned battery.

[0016] According to the technical scheme of the present application, the battery comprises a shell, an electrode assembly and a heating assembly, the heating assembly being arranged between the isolation film and the pole piece, the first end of the heating assembly being electrically connected to one of the positive pole and the negative pole, and the second end of the heating assembly being electrically connected to the inner wall of the shell, so that a good conductive connection structure is formed, an external power supply is electrically connected to the outer wall of the shell and the corresponding pole, the conductive heating assembly melts the isolation film, realizes the short circuit of the positive pole and the negative pole, and further simulates the thermal runaway of the battery. In the above-mentioned scheme, the heating assembly and the wire of the heating assembly are arranged inside the battery, without the need to modify the appearance of the battery, that is, without affecting the manufacturing and assembly of the battery, the thermal runaway of the battery is simulated by electrically connecting the outer wall of the shell and the corresponding pole, the connection position of the external power supply of the heating assembly can be adjusted according to the test needs, and the heating triggering time can be adjusted according to the use conditions, so that the operation is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings constituting a part of the specification of the present application are used to provide a further understanding of the present application, the schematic embodiments of the present application and the explanations thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 a structure schematic view of a first embodiment of a battery according to the present application is shown;

[0019] Figure 2 A structure schematic diagram of a second embodiment of the battery according to the utility model is shown.

[0020] Figure 3 A structure schematic diagram of a third embodiment of the battery according to the utility model is shown.

[0021] Among them, the above-mentioned drawings include the following reference signs:

[0022] 1, shell;

[0023] 2, positive sheet;

[0024] 21, first tab;

[0025] 3, negative sheet;

[0026] 31, second tab;

[0027] 4, isolation film;

[0028] 5, heating resistance;

[0029] 6, conductive piece;

[0030] 61, first pin; 62, second pin; 63, first lead; 64, second lead;

[0031] 7, positive column;

[0032] 8, negative column. DETAILED DESCRIPTION

[0033] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0034] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0035] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and the above-described drawings are intended to distinguish similar objects and not necessarily describe a particular sequential or chronological order. It should be understood that the terms as used in this manner can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in other than the order illustrated or described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus including a list of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to such processes, methods, products, or apparatus.

[0036] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in various different forms, and should not be construed as being limited to only the embodiments set forth herein. It should be understood that the embodiments are provided so that the disclosure of the present application is complete and comprehensive, and the concepts of the exemplary embodiments are sufficiently conveyed to those of ordinary skill in the art, and in the drawings, the thicknesses of layers and regions can be exaggerated for clarity, and the same reference numerals are used to denote the same elements, so that a description thereof will be omitted.

[0037] In conjunction with Figures 1 to 3 As shown, according to specific embodiments of the present application, a battery is provided.

[0038] Specifically, the battery comprises a shell 1, an electrode assembly, and a heating assembly. The top of the shell 1 is provided with a positive pole 7 and a negative pole 8, the electrode assembly is packaged in the shell 1, the electrode assembly comprises a pole piece and a separator film 4, the pole piece comprises a positive pole piece 2 and a negative pole piece 3, the separator film 4 is located between the positive pole piece 2 and the negative pole piece 3, the positive pole piece 2 is electrically connected with the positive pole 7, and the negative pole piece 3 is electrically connected with the negative pole 8; the heating assembly is arranged between the separator film 4 and the pole piece, a first end of the heating assembly is electrically connected with one of the positive pole 7 and the negative pole 8, and a second end of the heating assembly is electrically connected with the inner wall of the shell 1; wherein the shell 1 and the heating assembly are both made of conductive material.

[0039] The utility model discloses a technical scheme, battery includes: casing 1, electrode assembly and heating assembly, heating assembly is located between the diaphragm 4 and pole piece, and the first end of heating assembly is electrically connected with one of positive pole 7 and negative pole 8, and the second end of heating assembly is electrically connected with the inner wall of casing 1, forms good conductive connection structure, and the external power supply is electrically connected with the outer wall of casing and corresponding pole, and the conductive heating of heating assembly melts the diaphragm, realizes the short -circuit of positive pole piece and negative pole piece, and further simulates battery thermal runaway.

[0040] It should be noted that the positive pole 7 and the negative pole 8 are extended from the top of the casing 1, that is, part of the positive pole 7 and part of the negative pole 8 are located outside the casing, and the positive pole 7 and the negative pole 8 are insulated from the casing 1.

[0041] In an exemplary embodiment of the present application, the heating assembly includes a heating resistor 5, a first lead wire 63 and a second lead wire 64. The heating resistor 5 is arranged between the diaphragm 4 and the pole piece; the first lead wire 63 is connected with the heating resistor 5, and the heating resistor 5 is electrically connected with one of the positive pole 7 and the negative pole 8 through the first lead wire 63; the second lead wire 64 is connected with the heating resistor 5, and the heating resistor 5 is electrically connected with the inner wall of the casing 1 through the second lead wire 64.

[0042] As shown in Figure 1 The heating resistor 5 is arranged between the diaphragm 4 and the negative pole piece 3, and is tightly fitted with the diaphragm 4 and the negative pole piece 3 through a lamination process. The heating resistor 5 is provided with the first lead wire 63 and the second lead wire 64, the first lead wire 63 extends towards the top of the casing 1 to be electrically connected with the negative pole 8, and the second lead wire 64 extends towards the top of the casing 1 to be electrically connected with the inner top wall of the casing 1, that is, the heating resistor 5, the casing 1 and the negative pole 8 are connected in series to form a series loop. The first lead wire 63 and the second lead wire 64 are usually made of metal materials with good conductivity, such as copper or aluminum, which can effectively transmit current.

[0043] It can be understood that the first lead wire 63 can also extend towards the top of the casing 1 to be electrically connected with the positive pole 7, and the first lead wire 63 extends towards the top of the casing 1 to be electrically connected with the inner top wall of the casing 1, that is, the heating resistor 5, the casing 1 and the positive pole 7 are connected in series to form a series loop.

[0044] As an alternative implementation, the positive tab 2 is electrically connected to the positive post 7 through the first lug 21, the negative tab 3 is electrically connected to the negative post 8 through the second lug 31, the first lead 63 extends towards the top of the shell 1 to be electrically connected to the second lug 31, that is, the first lead 63 is electrically connected to the negative post 8 through the second lug 31, and the second lead 64 extends towards the top of the shell 1 to be electrically connected to the inner top wall of the shell 1, that is, the heating resistor 5, the shell 1 and the negative post 8 form a series loop.

[0045] As an alternative implementation, the positive tab 2 is electrically connected to the positive post 7 through the first lug 21, the negative tab 3 is electrically connected to the negative post 8 through the second lug 31, the first lead 63 extends towards the top of the shell 1 to be electrically connected to the second lug 31, that is, the first lead 63 is electrically connected to the negative post 8 through the second lug 31, and the second lead 64 extends towards the top of the shell 1 to be electrically connected to the inner top wall of the shell 1, that is, the heating resistor 5, the shell 1 and the negative post 7 form a series loop. In the thermal runaway research of the battery, the negative electrode of the external power supply is electrically connected to the negative post, and the positive electrode of the external power supply is electrically connected to the outer wall of the shell 1 to supply power to the series loop. The heating resistor 5 generates heat due to electricity. When the heating resistor 5 reaches a certain temperature, the isolation film 4 melts, allowing the negative tab 3 to directly contact the positive tab 2 to form an internal short circuit of the battery, thereby causing the temperature of the battery to rise. The above research process can be triggered under the conditions of battery standing, charging and discharging or other use conditions.

[0046] Further, the surfaces of the heating resistor 5, the first lead and the second lead are sprayed or pasted with insulating materials. The surfaces of the heating resistor 5, the first lead 63 and the second lead 64 are insulated to avoid direct conduction of the negative tab 3 and the positive tab 2.

[0047] In another exemplary embodiment of the present application, as shown in Figure 2 The heating assembly includes: a conductive piece 6 and a heating resistor 5. The conductive piece 6 is arranged between the isolation film 4 and the tab, and the conductive piece 6 has a first lead 61 and a second lead 62. The heating resistor 5 is arranged in close contact with the conductive piece 6, so that the heating resistor 5 is located between the isolation film 4 and the tab. The heating resistor 5 is electrically connected to one of the positive post 7 and the negative post 8 through the first lead 61, and the heating resistor 5 is electrically connected to the inner wall of the shell 1 through the second lead 62.

[0048] Specifically, as shown in Figure 2 The conductive piece 6 is a metal sheet. The heating resistor 5 is arranged in close contact with the conductive piece 6 to achieve electrical connection between the heating resistor 5 and the conductive piece 6. The conductive piece 6 is arranged between the isolation film 4 and the negative tab 3. Through a lamination process, the conductive piece 6 is arranged in close contact with the isolation film 4 and the negative tab 3, respectively. The heating resistor 5 is arranged in close contact with the isolation film 4.

[0049] In another exemplary embodiment of the present application, as shown in Figure 3 the conductive member 6 is in a U-shaped structure, the first pin 61 and the second pin 62 of the conductive member 6 both extend towards the top of the shell 1, wherein the end of the first pin 61 is electrically connected with the inner top wall of the shell 1, and the end of the second pin 62 is electrically connected with the negative pole 8, i.e. the heating resistor 5, the shell 1 and the negative pole 8 form a series circuit.

[0050] As an alternative embodiment, the conductive member 6 can also be in a rectangular structure.

[0051] It can be understood that the end of the second pin 62 can also be electrically connected with the positive pole 7, and the end of the first pin 61 is electrically connected with the inner top wall of the shell 1, i.e. the heating resistor 5, the shell 1 and the positive pole 7 form a series circuit.

[0052] As an alternative embodiment, the positive pole piece 2 is electrically connected with the positive pole 7 through the first tab 21, the negative pole piece 3 is electrically connected with the negative pole 8 through the second tab 31, and the end of the second pin 62 is electrically connected with the second tab 31, i.e. the end of the second pin 62 is electrically connected with the negative pole 8 through the second tab 31, and the end of the first pin 61 is electrically connected with the inner top wall of the shell 1, i.e. the heating resistor 5, the shell 1 and the negative pole 8 form a series circuit.

[0053] As an alternative embodiment, the positive pole piece 2 is electrically connected with the positive pole 7 through the first tab 21, the negative pole piece 3 is electrically connected with the negative pole 8 through the second tab 31, and the end of the second pin 62 is electrically connected with the first tab 21, i.e. the end of the second pin 62 is electrically connected with the negative pole 8 through the second tab 31, and the end of the first pin 61 is electrically connected with the inner top wall of the shell 1, i.e. the heating resistor 5, the shell 1 and the positive pole 7 form a series circuit.

[0054] In the research on thermal runaway of the battery, the negative pole of the external power supply is electrically connected with the negative pole, and the positive pole of the external power supply is electrically connected with the outer wall of the shell 1 to supply power to the series circuit, the heating resistor 5 generates heat due to electricity, and the heating resistor 5 melts the isolation film 4 when it reaches a certain temperature, so that the negative pole piece 3 directly contacts the positive pole piece 2 to form an internal short circuit of the battery, thereby causing the temperature of the battery to rise. The above research process can be triggered under the conditions of battery standing, charging and discharging or other use conditions.

[0055] Further, the surfaces of the heating resistor 5 and the conductive member 6 are sprayed or pasted with insulating materials. The surfaces of the heating resistor 5 and the conductive member 6 are insulated to avoid direct conduction of the negative pole piece 3 and the positive pole piece 2 by the heating resistor 5 and the conductive member 6.

[0056] The resistance of the heating resistor 5 can be selected according to the model of the battery.

[0057] Preferably, the resistance of the heating resistor is greater than or equal to 50Ω to prevent excessive battery leakage current from causing battery abnormality.

[0058] Further preferably, the resistance of the heating resistor is less than or equal to 100Ω to avoid an excessive load on the series circuit that may result in failure to melt the isolation film 4 .

[0059] Among them, since the pole is arranged close to the top of the shell 1, in order to reduce the length of the lead or simplify the structure of the conductive member, the second end of the heating component is electrically connected to the inner top wall of the shell 1.

[0060] Furthermore, the first end of the heating assembly is electrically connected to one of the positive electrode post 7 and the negative electrode post 8 by welding, and the second end of the heating assembly is electrically connected to the inner wall of the housing 1 by welding. Welding is a reliable connection method that can ensure the firmness and stability of the connection, while also reducing the connection resistance and improving the current transmission efficiency.

[0061] Specifically, if Figure 1 、 Figure 2 As shown, the first end of the heating assembly is electrically connected to the negative electrode 8 located in the shell 1 by welding, and the second end of the heating assembly is electrically connected to the inner top wall of the shell 1 by welding.

[0062] As an alternative embodiment, the first end of the heating assembly is electrically connected to the second electrode tab 31 on the negative electrode sheet 3 by welding. Alternatively, the first end of the heating assembly is electrically connected to the positive electrode column 7 located in the housing 1 by welding. Alternatively, the first end of the heating assembly is electrically connected to the first electrode tab 21 on the positive electrode sheet 2 by welding.

[0063] According to another specific embodiment of the present application, a vehicle is provided, which includes a battery, and the battery is the battery in the above embodiment. Specifically, the battery includes: a shell 1, an electrode assembly and a heating assembly. A positive electrode column 7 and a negative electrode column 8 are provided on the top of the shell 1, and the electrode assembly is encapsulated in the shell 1. The electrode assembly includes a pole piece and a separator 4. The pole piece includes a positive pole piece 2 and a negative pole piece 3. The separator 4 is located between the positive pole piece 2 and the negative pole piece 3. The positive pole piece 2 is electrically connected to the positive pole piece 7, and the negative pole piece 3 is electrically connected to the negative pole piece 8; the heating assembly is provided between the separator 4 and the pole piece, the first end of the heating assembly is electrically connected to one of the positive pole piece 7 and the negative pole piece 8, and the second end of the heating assembly is electrically connected to the inner wall of the shell 1; wherein the shell 1 and the heating assembly are both made of conductive materials.

[0064] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0065] 1. The heating assembly and the lead wire of the heating assembly are arranged inside the battery, without the need to modify the appearance of the battery, that is, without affecting the manufacturing and assembly of the battery, the thermal runaway of the battery is simulated by electrically connecting the outer wall of the shell and the corresponding pole.

[0066] 2. The position of triggering the short circuit of the battery is the battery pole and the entire battery shell, and the external power supply connection position can be arranged according to the product characteristics, and the application scenarios are more extensive.

[0067] For the convenience of description, spatial relative terms such as "above", "upper", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "above" other devices or structures will be positioned "below" or "below" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0068] In addition to the above, it should also be noted that "one embodiment", "another embodiment", "embodiment" and the like mentioned in the specification refer to specific features, structures or characteristics described in conjunction with the embodiment, which are included in at least one embodiment described in the general description of the application. The same expression appears in several places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the implementation of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present application.

[0069] In the above embodiments, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0070] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized by, The battery comprises: a shell (1), a top of the shell (1) being provided with a positive pole column (7) and a negative pole column (8); an electrode assembly, the electrode assembly being encapsulated in the shell (1), the electrode assembly comprising a pole piece and a separator film (4), the pole piece comprising a positive pole piece (2) and a negative pole piece (3), the separator film (4) being located between the positive pole piece (2) and the negative pole piece (3), the positive pole piece (2) being electrically connected with the positive pole column (7), and the negative pole piece (3) being electrically connected with the negative pole column (8); a heating assembly, the heating assembly being located between the separator film (4) and the pole piece, a first end of the heating assembly being electrically connected with one of the positive pole column (7) and the negative pole column (8), and a second end of the heating assembly being electrically connected with an inner wall of the shell (1); wherein the shell (1) and the heating assembly are both made of conductive material.

2. The battery of claim 1, wherein, The heating assembly comprises: a heating resistor (5), the heating resistor (5) being located between the separator film (4) and the pole piece; a first lead wire (63), the first lead wire (63) being connected with the heating resistor (5), the heating resistor (5) being electrically connected with one of the positive pole column (7) and the negative pole column (8) through the first lead wire (63); a second lead wire (64), the second lead wire (64) being connected with the heating resistor (5), the heating resistor (5) being electrically connected with the inner wall of the shell (1) through the second lead wire (64).

3. The battery of claim 2, wherein, Surfaces of the heating resistor (5), the first lead wire (63) and the second lead wire (64) are all sprayed or pasted with insulating material.

4. The battery of claim 1, wherein, The heating assembly comprises: a conductive piece (6), the conductive piece (6) being located between the separator film (4) and the pole piece, the conductive piece (6) having a first pin (61) and a second pin (62); a heating resistor (5), the heating resistor (5) being arranged in close contact with the conductive piece (6) so that the heating resistor (5) is located between the separator film (4) and the pole piece, the heating resistor (5) being electrically connected with one of the positive pole column (7) and the negative pole column (8) through the first pin (61), and the heating resistor (5) being electrically connected with the inner wall of the shell (1) through the second pin (62).

5. The battery of claim 4, wherein, Surfaces of the heating resistor (5) and the conductive piece (6) are all sprayed or pasted with insulating material.

6. The battery of claim 4, wherein, The conductive piece (6) has a U-shaped structure or a rectangular structure.

7. The battery of any one of claims 2-6, wherein, The heating resistor (5) has a resistance value greater than or equal to 50Ω.

8. The battery of claim 7, wherein, The heating resistor (5) has a resistance value less than or equal to 100Ω.

9. The battery of claim 1, wherein, The first end of the heating assembly is electrically connected with one of the positive pole column (7) and the negative pole column (8) through welding, and the second end of the heating assembly is electrically connected with the inner wall of the shell (1) through welding.

10. A vehicle comprising a battery, characterized in that The battery is the battery according to any one of claims 1-9.

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