Battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery and a battery pack, the battery comprises: a housing, which is internally provided with a mounting cavity; the electrode assembly is arranged in the mounting cavity; the heating piece is arranged in the mounting cavity and attached to the electrode assembly, the heating piece comprises two heating bodies, one heating body is connected with a tab of a positive electrode of the electrode assembly, the other heating body is connected with a tab of a negative electrode of the electrode assembly, and the two heating bodies are connected through an external control assembly; according to the utility model, the heating element which is directly attached to the electrode assembly is arranged in the shell, the heating element is connected with the tabs of the electrode assembly to form the heating loop, and the heating element can directly supply energy for heating through the electrode assembly; therefore, heat exchange between the heating piece and the external environment can be remarkably reduced, the heating piece can quickly, efficiently and directly transfer heat of the heating piece to the electrode assembly, and the heating efficiency of the heating piece is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and a battery pack. Background Art

[0002] Batteries are currently widely used in power battery systems or energy storage systems. However, in low-temperature environments, the charging and discharging performance of batteries will be greatly limited. Therefore, in order to avoid the limitation of the charging and discharging performance of batteries in low-temperature environments, the batteries need to be heated when working in low-temperature environments.

[0003] At present, the existing battery heating method mainly involves sticking a heating sheet on the surface of its shell. When the heating sheet is powered on, it generates heat and then transfers the heat to the battery through the shell. When this heating method is used in a low-temperature environment, only one side of the heating sheet can be used to heat the battery. The side wall of the heating sheet that is not in contact with the battery shell will quickly exchange heat with the external environment. In addition, the surface of the battery shell that is in contact with the air will also have heat loss, that is, heat will also be lost in the process of heat being transferred from the shell to the inside of the battery, resulting in low overall heating efficiency. Utility Model Content

[0004] In view of this, the present invention provides a battery and a battery pack to solve the problem of low efficiency of existing battery heating methods.

[0005] In the first aspect, the utility model provides a battery, comprising: a shell having an installation cavity inside; an electrode assembly, arranged in the installation cavity; a heating element, arranged in the installation cavity and fitted with the electrode assembly, the heating element comprising two heating elements, one of which is connected to the pole ear of the positive pole of the electrode assembly, and the other is connected to the pole ear of the negative pole of the electrode assembly, the two heating elements are connected through an external control component, the electrode assembly, the two heating elements and the external control component are connected to form a heating circuit, the heating element has a heating state in which the heating circuit is enabled by the external control component, and a stop state in which the heating circuit is disconnected by the external control component.

[0006] A heating element is provided inside the shell and is directly bonded to the electrode assembly. The heating element is connected to the electrode ear of the electrode assembly to form a heating circuit. The heating element can be directly powered and heated by the electrode assembly. The working control method of the heating element is simple and efficient and does not require an additional independent power supply. Since the heating element is located inside the shell and is directly bonded to the corresponding electrode assembly, the heat exchange between the heating element and the external environment can be significantly reduced in a low temperature environment. The heating element can quickly and efficiently transfer its own heat directly to the electrode assembly, quickly increase the temperature of the electrode assembly to a preset temperature, effectively improve the heating efficiency of the heating element and shorten the heating time, and effectively solve the problem of low efficiency of existing battery heating methods.

[0007] In an optional embodiment, the heating element is a PTC heating element.

[0008] The PTC heating element has high heating efficiency and stronger safety performance. When the PTC heating element reaches a certain temperature, its own heating power will automatically drop sharply, which can avoid continuous heating of the electrode assembly and damage to the electrode assembly in the event of a fault, effectively preventing safety accidents.

[0009] In an optional embodiment, the heating element further includes a substrate having an installation space inside for installing the heating element, and heating surfaces are respectively provided on both sides of the substrate, and the electrode assembly is bonded to the heating surface.

[0010] While protecting the heating element, the substrate can also ensure good fit between the heating element and the electrode assembly, so that the heat of the heating element can be evenly transferred to the electrode assembly, avoiding local overheating and damage to the electrode assembly.

[0011] In an optional embodiment, the heating element further includes a protective layer arranged on the outer wall of the substrate.

[0012] The protective layer can improve the reliability and durability of the substrate, and can prevent the substrate from being corroded by long-term contact with the electrolyte.

[0013] In an optional embodiment, a connecting wire is further included. The connecting wire is passed through the top of the shell and connected to the heating element. The end of the connecting wire passes through the shell to form a connecting end for connecting to the control component. The structure is simple and reliable and easy to process and manufacture.

[0014] In an optional embodiment, a connection hole for the connection line to pass through is provided on the top of the shell, and a sealing structure is provided between the inner wall of the connection hole and the outer wall of the connection line.

[0015] Ensure that the shell has the required sealing performance after the connection line is set.

[0016] In an optional embodiment, there are multiple electrode assemblies and they are arranged side by side along the thickness direction. A heating element is provided between at least two adjacent electrode assemblies, and both side surfaces of the heating element are respectively attached to the corresponding electrode assemblies.

[0017] This type of heating element has a large area on both sides that fits with the corresponding electrode assembly, which can further improve the heating efficiency.

[0018] In an optional embodiment, the heating element is bonded to the electrode assembly.

[0019] The internal structure of the battery is compact, and the heating element is bonded to the electrode assembly, which can improve the position reliability of the heating element after assembly, thereby reducing the risk of the heating element falling off and burning dry.

[0020] In the second aspect, the utility model also provides a battery pack, which includes: a plurality of the above-mentioned batteries, arranged in sequence along a preset direction; a connecting component, extending along the preset direction and passing through each battery in sequence and connected to the two heating elements of each battery respectively, and the connecting component is suitable for connecting to the control component.

[0021] The battery pack of this embodiment can be connected to multiple heating elements at the same time through one connecting assembly. The overall structure is simple and the number of components is small, which is convenient for processing and manufacturing.

[0022] In an optional embodiment, a tab is provided on the battery, and the connecting component is a signal collecting component connected to the tab.

[0023] Directly using the signal acquisition component in the battery pack as a connection component can simplify the structural setting and improve the integration of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of an explosion of a battery according to an embodiment of the present utility model;

[0026] Figure 2 for Figure 1 A schematic diagram of the internal structure of the heating element of the battery shown;

[0027] Figure 3 for Figure 1 A schematic structural diagram of a substrate of a heating element of a battery shown;

[0028] Figure 4 This is a three-dimensional schematic diagram of a battery pack according to an embodiment of the present invention;

[0029] Figure 5 for Figure 4 Schematic diagram of the connection method between the connecting components of the battery pack and the heating element;

[0030] Figure 6 for Figure 5 A schematic diagram of the connection assembly shown being connected to a single heating element;

[0031] Figure 7 for Figure 6 The A-outlet enlarged schematic diagram of the connection component shown is connected to a single heating element.

[0032] Description of reference numerals:

[0033] 1. Shell; 101. Mounting cavity; 103. Outer shell; 104. Top cover; 1041. Connection hole; 2. Electrode assembly; 201. Tab; 3. Heating element; 301. Heating element; 302. Substrate; 4. Connecting wire; 5. Connecting assembly. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0035] The following combination Figures 1 to 7 , describing the embodiments of the present utility model.

[0036] According to an embodiment of the present invention, on the one hand, a battery is provided, comprising: a shell 1, an electrode assembly 2 and a heating element 3, the shell 1 having an installation cavity 101, the electrode assembly 2 being arranged in the installation cavity 101, the heating element 3 being arranged in the installation cavity 101 and being attached to the electrode assembly 2, the heating element 3 comprising two heating elements 301, one of the heating elements 301 being connected to the positive pole ear 201 of the electrode assembly 2, and the other heating element 301 being connected to the negative pole ear 201 of the electrode assembly 2, the two heating elements 301 being connected through an external control component, the electrode assembly 2, the two heating elements 301 and the external control component being connected to form a heating circuit, the heating element 3 having a heating state in which the heating circuit is enabled by the external control component, and a stop state in which the heating circuit is disconnected by the external control component.

[0037] In the battery using this embodiment, a heating element 3 is provided inside the shell 1, which is directly bonded to the electrode assembly 2. The heating element 3 is connected to the electrode ear of the electrode assembly 2 to form a heating circuit. The heating element 3 can be directly powered by the electrode assembly 2 for heating. The working control method of the heating element 3 is simple and efficient and does not require an additional independent power supply. Since the heating element 3 is located inside the shell 1 and is bonded to the corresponding electrode assembly 2 over a large area, the heat exchange between the heating element 3 and the external environment can be significantly reduced in a low temperature environment. The heating element 3 can quickly and efficiently transfer its own heat directly to the electrode assembly 2, quickly increase the temperature of the electrode assembly 2 to a preset temperature, effectively improve the heating efficiency of the heating element 3 and shorten the heating time, and effectively solve the problem of low efficiency of existing battery heating methods.

[0038] In one possible embodiment, the heating element 301 is a PTC heating element. The PTC heating element has high heating efficiency and stronger safety performance. When the PTC heating element reaches a certain temperature, its own heating power will automatically drop sharply, which can avoid continuous heating of the electrode assembly 2 and damage to the electrode assembly 2 during a fault, effectively preventing safety accidents.

[0039] Specifically, the PTC heater is usually composed of a polymer material filled with carbon black particles and silver paste. Since the resistance characteristic curve of the PTC heater can be changed by adjusting the composition, the specific power rapid drop temperature of the PTC heater is not limited here. It can be 60°C, 70°C, and 80°C, etc., and can be selected according to the specifications and temperature characteristics of the electrode assembly 2.

[0040] Preferably, the temperature at which the power of the PTC heating element drops rapidly is 70° C. When the temperature of the PTC heating element is greater than or equal to 70° C., its own resistance will increase rapidly.

[0041] In one possible embodiment, the heating element 3 further includes a substrate 302, the interior of the substrate 302 having an installation space for installing the heating element 301, heating surfaces formed on both sides of the substrate 302, and the electrode assembly 2 being in contact with the heating surfaces. While protecting the heating element 301, the substrate 302 can also ensure that the heating element 3 is in good contact with the electrode assembly 2, so that the heat of the heating element 301 can be evenly transferred to the electrode assembly 2, thereby avoiding local overheating and damage to the electrode assembly 2. When the heating element 3 is located between two electrode assemblies 2, the heating surfaces on both sides of the heating element 3 are in contact with the electrode assembly 2. When the heating element 3 is located between the electrode assembly 2 and the shell 1, the heating surface on one side of the heating element 3 is in contact with the electrode assembly, and the heating surface on the other side of the heating element 3 can heat the electrolyte or air inside the shell 1, thereby indirectly heating the electrode assembly 2.

[0042] It is understood that, as an alternative embodiment, the substrate 302 may not be provided, and the heating element 301 may be directly attached to the electrode assembly 2. It is particularly noted that the surface of the heating element 301 may be coated with an insulating layer.

[0043] Specifically, there is no specific limitation on the specifications and dimensions of the substrate 302 , and it can be flexibly selected as long as it can reliably fit with the electrode assembly 2 .

[0044] In a possible embodiment, the heating element 3 further includes a protective layer disposed on the outer wall of the substrate 302 to improve the reliability and durability of the substrate 302 . The protective layer can prevent the substrate 302 from being corroded due to prolonged contact with the electrolyte.

[0045] Specifically, there is no limitation on the specific type of the protective layer, which may be a fluorine coating or a green glue composed of a polyester film and a silicone glue system, as long as it can effectively protect the substrate 302 .

[0046] In one possible implementation, Figure 2 As shown, two heating elements 301 are symmetrically arranged in the substrate 302. The symmetrical arrangement of the heating elements 301 can improve the uniformity of the heating process.

[0047] There is no limitation on the symmetry axis of the symmetrical arrangement of the heating element 301 , and the heating element 301 can be matched according to the symmetry axis of the electrode assembly 2 .

[0048] In one possible embodiment, a connecting wire 4 is further included. The connecting wire 4 is passed through the housing 1 and connected to the heating element 3. The end of the connecting wire 4 that passes through the housing 1 forms a connection end for connecting to the control component. The structure is simple and reliable, and easy to manufacture. The connecting wire 4 can be passed through the top of the housing 1, or through the bottom or side of the housing. The housing 1 can include an outer shell 103 and a top cover 104. The top cover 104 is connected to the opening of the outer shell 103. The connecting wire 4 can be passed through the top cover 104 or through the outer shell 103, and the specific choice can be made according to actual layout requirements.

[0049] It can be understood that, as an alternative embodiment, the heating element 3 can also be directly provided in the housing 1 and connected to the control assembly.

[0050] Specifically, the connection end of the connecting line 4 has a plug connector, and the connecting line 4 is detachably connected to the control component through the plug connector, which is convenient for installation and disassembly.

[0051] In one possible embodiment, the top of the housing 1 is provided with a connection hole 1041 for passing the connection line 4. A sealing structure is provided between the inner wall of the connection hole 1041 and the outer wall of the connection line 4 to ensure that the housing 1 has satisfactory sealing performance after the connection line 4 is installed. The sealing structure can be a sealant or a sealing ring, which is not limited here.

[0052] Specifically, if Figure 1 As shown, the housing 1 includes an outer shell 103 and a top cover 104 disposed on the top of the outer shell 103 . The outer shell 103 and the top cover 104 together form an installation cavity 101 , and a connection hole 1041 is located in the top cover 104 .

[0053] In one possible embodiment, there are multiple electrode assemblies 2 and they are arranged side by side in the thickness direction. A heating element 3 is provided between at least two adjacent electrode assemblies 2. The two side surfaces of the heating element 3 are respectively bonded to the corresponding electrode assemblies 2. In this form, both sides of the heating element 3 are directly bonded to the corresponding electrode assemblies 2, which can further improve the heating efficiency. In particular, when the heating element 3 is located between two electrode assemblies 2, the two heating bodies of the heating element 3 can be respectively connected to the positive electrode tab (201) and the negative electrode tab (201) of any one of the two electrode assemblies 2.

[0054] Furthermore, the outer surfaces of the electrode assemblies 2 at both ends of the arrangement direction (i.e., the surfaces opposite the inner wall of the housing 1) may or may not be provided with heating elements 3. Specifically, the provision of heating elements 3 can improve heating uniformity. If heating elements 3 are only arranged between adjacent electrode assemblies 2 within the housing 1, both sides of all heating elements 3 can be used to directly heat the electrode assemblies 2, thereby improving energy utilization.

[0055] Among them, in this embodiment, there is no strict limitation on the specific number of electrode assemblies 2 and the specific number of heating elements 3. Two, three, four or more electrode assemblies 2 can be arranged side by side in the installation cavity 101, and the heating element 3 can be arranged between every two adjacent electrode assemblies 2, or between two partially adjacent electrode assemblies 2. It can be flexibly selected according to needs.

[0056] Preferably, two electrode assemblies 2 are arranged side by side inside the shell 1, and a heating element 3 is arranged between the two electrode assemblies 2. This arrangement can improve the heating efficiency while reducing the number of electrode assemblies 2 and reduce the number and complexity of internal components of the shell 1.

[0057] In one possible embodiment, the heating element 3 is bonded to the electrode assembly 2, which can make the internal structure of the battery more compact, improve the position reliability of the heating element 3 after assembly, and reduce the risk of the heating element 3 falling off and burning dry. Specifically, when the electrode assembly 2 is provided on both sides of the heating element 3, the heating element 3 is bonded to the electrode assemblies 2 on both sides. The heating element 3 is located between the electrode assemblies 2 and is bonded to the electrode assemblies 2 on both sides, which can further improve the position reliability of the heating element 3 after assembly.

[0058] According to an embodiment of the present invention, on the other hand, Figures 4 to 7 As shown, a battery pack is provided, which includes: a plurality of the above-mentioned batteries and a connecting component 5, the plurality of batteries are arranged in sequence along a preset direction, the connecting component 5 extends along the preset direction and passes through each battery in sequence and is respectively connected to the two heating elements 301 of each battery, and the connecting component 5 is suitable for connecting to the control component.

[0059] The battery pack of this embodiment can be connected to multiple heating elements 3 at the same time through one connecting assembly 5. The overall structure is simple and the number of components is small, which is convenient for processing and manufacturing.

[0060] It can be understood that, as an alternative embodiment, the number of connecting components 5 can also be multiple, where one connecting component 5 is connected to some heating elements 3 in multiple batteries, and multiple batteries are connected to the control component through multiple corresponding connecting components 5.

[0061] Specifically, there is no specific limitation on the number and arrangement of batteries, and they can be flexibly selected according to needs. In the prior art, a heating plate is usually set on one side of the battery pack to heat multiple batteries at the same time. When the number of batteries changes, the size of the heating plate needs to be adjusted accordingly. In this embodiment, since the battery heating element 3 is located inside the shell 1, when the number and arrangement of batteries in the battery pack change, there is no need to adaptively adjust the heating plate separately. It is only necessary to increase or decrease the batteries accordingly, and the adaptability is high.

[0062] In one possible embodiment, the battery is provided with a tab, and the connecting component 5 is a signal acquisition component connected to the tab. In the battery pack, a signal acquisition component is required to collect information such as battery temperature, current, and voltage. The signal acquisition component is connected to the control component. Directly using the signal acquisition component in the battery pack as a connecting component can simplify the structural configuration and improve the integration of the battery pack.

[0063] Among them, the signal acquisition component can be a sampling harness, FPC (Flexible Printed Circuit), FFC (Flexible Flat Cable), FDC (Flexible Die-cutting Circuit), etc., which can be flexibly selected according to needs.

[0064] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: A housing (1) having a mounting cavity (101) therein; An electrode assembly (2) is disposed in the mounting cavity (101); A heating element (3) is arranged in the installation cavity (101) and is attached to the electrode assembly (2). The heating element (3) includes two heating elements (301), one of which is connected to the positive electrode tab (201) of the electrode assembly (2), and the other is connected to the negative electrode tab (201) of the electrode assembly (2). The two heating elements (301) are connected via an external control component. The electrode assembly (2), the two heating elements (301) and the external control component are connected to form a heating circuit. The heating element (3) has a heating state in which the heating circuit is connected via the external control component, and a stop state in which the heating circuit is disconnected via the external control component.

2. The battery according to claim 1, characterized in that The heating element (301) is a PTC heating element.

3. The battery according to claim 2, characterized in that The heating element (3) further comprises a substrate (302), wherein the substrate (302) has an installation space inside for installing the heating element (301), and heating surfaces are formed on both sides of the substrate (302), and the electrode assembly (2) is bonded to the heating surfaces.

4. The battery according to claim 3, characterized in that The heating element (3) further comprises a protective layer arranged on the outer wall of the substrate (302).

5. The battery according to any one of claims 1 to 4, characterized in that It also includes a connecting wire (4), which is passed through the housing (1) and connected to the heating element (3), and the end of the connecting wire (4) passing through the housing (1) forms a connecting end for connecting to the control component.

6. The battery according to claim 5, characterized in that The housing (1) is provided with a connection hole (1041) for the connection line (4) to pass through, and a sealing structure is provided between the inner wall of the connection hole (1041) and the outer wall of the connection line (4).

7. The battery according to any one of claims 1 to 4, characterized in that The electrode assemblies (2) are multiple in number and arranged side by side in the thickness direction, the heating element (3) is arranged between at least two adjacent electrode assemblies (2), and the two side surfaces of the heating element (3) are respectively in contact with the corresponding electrode assemblies (2).

8. The battery according to claim 1, characterized in that The heating element (3) is bonded to the electrode assembly (2).

9. A battery pack, characterized in that: include: A plurality of batteries according to any one of claims 1 to 8, arranged sequentially along a preset direction; A connecting component (5) extends along the preset direction and passes through each battery in sequence and is respectively connected to the two heating elements (301) of each battery. The connecting component (5) is suitable for connection with a control component.

10. The battery pack according to claim 9, wherein: The battery is provided with a tab, and the connecting component (5) is a signal collecting component connected to the tab.

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