Battery structure and power module

Abstract

The utility model belongs to battery technical field, concretely relates to a battery structure and power module, the battery structure includes casing, electric core body, first temperature detection part and second temperature detection part, electric core body sets up in the inside of casing, be equipped with first connecting side surface and second connecting side surface on the casing, be equipped with polarity connecting piece in first connecting side surface, be equipped with explosion -proof hole in second connecting side surface, second temperature detection part is connected in second connecting side surface, and the detection end of second temperature detection part sets up between electric core body and second connecting side surface, the detection end of first temperature detection part sets up between first connecting side surface and electric core body, the utility model can detect the temperature of different positions, and then be favorable to the temperature of the inside of battery of quick detection, and ensure the stability and security of use.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a battery structure and power module. Background Technology

[0002] As is well known, lithium-ion batteries are widely used in portable electronic devices for computers, communications, and entertainment. Their high energy density makes them a top choice for electric vehicles and hybrid vehicles. However, electric vehicle fires are not uncommon. Since 2013, Tesla electric vehicles have experienced multiple fires, and electric vehicles, buses, and bicycles in China have also suffered numerous fires and explosions, even endangering nearby parked vehicles and causing significant losses. Temperature and temperature difference are among the most important factors affecting the performance and lifespan of energy storage batteries. Actual usage data shows that the highest temperature area in a battery cell is near the cell terminals.

[0003] However, because the positive and negative terminals and the pressure relief valve of the existing battery cell are located on the same side of the cell, in order to prevent the pressure relief from being blocked and affecting the pressure relief and explosion-proof function, it is impossible to quickly detect the internal temperature of the battery. This will have a very negative impact on the performance and lifespan of the battery cell. Utility Model Content

[0004] The purpose of this invention is to provide a battery structure that addresses the shortcomings of existing technologies and solves the technical problem that existing technologies cannot quickly detect the internal temperature of a battery.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A battery structure includes a casing, a cell body, a first temperature detection component, and a second temperature detection component; the cell body is disposed inside the casing; the casing has a first connecting side and a second connecting side; the first connecting side has a polarity connector; the second connecting side has an explosion-proof hole; the second temperature detection component is connected to the second connecting side; and the detection end of the second temperature detection component is disposed between the cell body and the second connecting side; the detection end of the first temperature detection component is disposed between the first connecting side and the cell body.

[0007] Preferably, the housing includes a cover plate and a bottom shell connected to each other; the battery cell body is disposed between the cover plate and the bottom shell; the first connecting side is disposed on the surface of the cover plate away from the battery cell body; the second connecting side is disposed on the surface of the bottom shell away from the battery cell body; and the first connecting side and the second connecting side are respectively disposed opposite to each other on both sides of the battery cell body.

[0008] Preferably, the polarity connector includes a first terminal component and a second terminal component with opposite polarities; the first terminal component and the second terminal component are respectively connected to the interior of the first connection side; at least two tab connectors are provided on one side of the battery cell body; the first terminal component and the second terminal component are respectively connected to two different tab connectors.

[0009] Preferably, the first pole post component and / or the second pole post component includes an outer connecting section and an inner connecting section that are connected to each other; the outer connecting section is connected to the interior of the first connecting side; and the inner connecting section is electrically connected to the tab connector.

[0010] Preferably, the electrode connector includes a vertical connecting section and a horizontal connecting section connected to each other; the vertical connecting section is electrically connected to the first electrode post component and / or the second electrode post component; the horizontal connecting section is provided with a mounting groove; and the battery cell body is connected to the interior of the mounting groove.

[0011] Preferably, the first temperature detection component includes a temperature sensor and a first sensing pin; the temperature sensor is disposed between the first connection side and the battery cell body; the temperature sensor is electrically connected to the first sensing pin; and the first sensing pin is connected to the second connection side.

[0012] Preferably, the second temperature detection component includes a temperature detection element and a second sensing pin; the temperature detection element is disposed between the battery cell body and the second connection side and abuts against the battery cell body; the temperature detection element is electrically connected to the second sensing pin; the second sensing pin is connected to the second connection side.

[0013] This utility model also discloses a power module, including a battery body, a liquid cooling plate, and a conductive connecting piece; wherein the battery body has the battery structure described above; the liquid cooling plate is disposed at the bottom of the housing, and the polarity connector is disposed between the liquid cooling plate and the housing; the conductive connecting piece is disposed between the liquid cooling plate and the polarity connector; and one side surface of the conductive connecting piece abuts against at least two polarity connectors in the battery body; the other side surface of the conductive connecting piece abuts against the liquid cooling plate.

[0014] Preferably, the power module further includes an adhesive component; the adhesive component is connected between the housing, the polarity connector and the liquid cooling plate.

[0015] Preferably, the liquid cooling plate has a liquid storage cavity; the liquid cooling plate has an input pipe and an output pipe communicating with the liquid storage cavity; the input pipe is used to communicate with an external liquid pump and a liquid storage container; the output pipe is used to communicate with an external liquid discharge pump and a circulation container.

[0016] The beneficial effect of this utility model is that the technical solution uses a first temperature detection component and a second temperature detection component to detect the temperature at different positions between the cell body and the casing, so as to obtain the temperature difference between the terminal surface and the non-terminal surface; thus, it is beneficial to detect the temperature at different positions, which in turn facilitates the rapid detection of the internal temperature of the battery, and ensures the stability and safety of use. Attached Figure Description

[0017] The following will refer to the appendix. Figures 1-6 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0018] Figure 1 This is a schematic diagram of the battery structure according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the battery structure according to an embodiment of the present invention;

[0020] Figure 3 This is a cross-sectional view of a battery structure according to an embodiment of the present invention;

[0021] Figure 4 This is a partially enlarged view of the battery structure according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the power module structure according to an embodiment of the present invention;

[0023] Figure 6 This is a partial enlarged view of a power module according to an embodiment of the present invention.

[0024] In the diagram: 100-Battery body; 1-Casing; 101-First connecting side; 102-Second connecting side; 11-Cover plate; 12-Bottom shell; 2-Cell body; 21-Electrical tab connector; 211-Vertical connecting section; 212-Horizontal connecting section; 3-Explosion-proof hole; 41-First temperature detection component; 411-Temperature sensor; 42-Second temperature detection component; 5-Polarity connector; 51-First terminal component; 52-Second terminal component; 501-Outer connecting section; 502-Inner connecting section; 503-Assembly hole; 6-Liquid cooling plate; 7-Conductive connecting piece; 8-Adhesive component. Detailed Implementation

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or multiple situations existing alone. In addition, the character " / " in this document generally indicates that the related objects before and after are in an "or" relationship.

[0029] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0030] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0031] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0032] The following is in conjunction with the appendix Figures 1-6 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0033] like Figure 1 and 2 As shown, in one embodiment of this utility model, the battery structure includes a housing 1, a cell body 2, a first temperature detection component 41, and a second temperature detection component 42. The cell body 2 is disposed inside the housing 1. The housing 1 is provided with a first connecting side 101 and a second connecting side 102. A polarity connector 5 is provided in the first connecting side 101. An explosion-proof hole 3 is provided in the second connecting side 102 for installing an explosion-proof valve. The second temperature detection component 42 is connected to the second connecting side 102, and the detection end of the second temperature detection component 42 is disposed between the cell body 2 and the second connecting side 102. The detection end of the first temperature detection component 41 is disposed between the first connecting side 101 and the cell body 2.

[0034] The technical solution of this utility model uses a first temperature detection component and a second temperature detection component to detect the temperature at different locations between the cell body and the casing, so as to obtain the temperature difference between the terminal surface and the non-terminal surface; thus, it is beneficial to detect the temperature at different locations, which in turn facilitates the rapid detection of the internal temperature of the battery, and ensures the stability and safety of use.

[0035] The battery cell body 2 includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer, with the active material layer coated on the surface of the current collector. The current collector includes a positive electrode coating area and a positive electrode tab connected to the coating area. The coating area is coated with the active material layer, while the tab is not. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the active material layer includes the active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area. The negative electrode coating area is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0036] The explosion-proof valve comprises a valve body (base), a sealing membrane (critical functional layer), and a filter protection layer. The valve has a pressure relief channel communicating with the interior of the housing 1. The valve body (base) is connected to the interior of the housing 1. The sealing membrane is connected to the interior of the pressure relief channel. The filter protection layer is connected to the outside of the sealing membrane and is located at the outlet of the pressure relief channel. Furthermore, the valve body is the "skeleton" of the explosion-proof valve, its main function being to fix the valve to the battery housing and provide a reference for the installation and sealing of other components. The size of the pressure relief channel determines the maximum pressure relief flow rate. A sealing groove or welded surface is provided on the outside, tightly fitting the housing. The filter protection layer uses a metal dustproof mesh (stainless steel material, pore size 50-200μm, balancing air permeability and filtration); or a porous ceramic / polymer breathable membrane (such as a PTFE breathable membrane, which has "breathable but not leak-proof" characteristics, further blocking liquid electrolyte). The sealing membrane is made of metal foil (aluminum foil, nickel foil, thickness 0.01-0.1mm) or polymer film (PTFE, PP, resistant to electrolyte corrosion). Principle: The pressure relief threshold is set by the membrane's own "rupture strength" (e.g., 100-300kPa, adjusted according to battery type). When the internal pressure exceeds the threshold, the membrane ruptures at a pre-set weak point (e.g., a groove, thinning area), thus releasing pressure. Of course, the specific structure of the explosion-proof valve can be selected based on the actual application, using any prior art technology; therefore, no specific limitations are made here.

[0037] Specifically, in some implementations, such as Figure 1 and 2As shown, the housing 1 includes a cover plate 11 and a bottom shell 12 connected side-by-side as a single unit; the battery cell body 2 is disposed between the cover plate 11 and the bottom shell 12; a first connecting side 101 is disposed on the surface of the cover plate 11 away from the battery cell body 2; a second connecting side 102 is disposed on the surface of the bottom shell 12 away from the battery cell body 2; and the first connecting side 101 and the second connecting side 102 are respectively disposed opposite to each other on both sides of the battery cell body 2. In some embodiments, the second connecting side 102 is disposed on the outer bottom of the bottom shell 12; and the first connecting side 101 is disposed on the outer top of the cover plate 11. This structure, through the polarity connector 5 and the explosion-proof hole and its explosion-proof valve, is located on two opposite sides of the battery cell body 2, and is respectively disposed on the cover plate 11 and the bottom shell 12; this facilitates rapid detection of the internal temperature of the battery and ensures stability and safety during use.

[0038] Specifically, in some implementations, such as Figure 2 and 3 As shown, the polarity connector 5 includes a first terminal component 51 and a second terminal component 52 with opposite polarities; the first terminal component 51 and the second terminal component 52 are respectively connected to the interior of the first connecting side 101; at least two tab connectors 21 are provided on one side of the cell body 2; the first terminal component 51 and the second terminal component 52 are respectively connected to two different tab connectors 21. Wherein, when the first terminal component 51 is the positive terminal, the second terminal component 52 is the negative terminal; and vice versa. This structure allows different first terminal components 51 and second terminal components 52, as well as the explosion-proof hole 3 and its explosion-proof valve, to be located on two relatively different sides of the cell body 2, and respectively disposed on the cover plate 11 and the bottom shell 12; this facilitates rapid detection of the internal temperature of the battery and ensures stability and safety during use.

[0039] In some implementation methods, such as Figure 3 and 4 As shown, the first pole piece 51 and / or the second pole piece 52 include an outer connecting section 501 and an inner connecting section 502 that are integrally connected to each other; the outer connecting section 501 is connected to the interior of the first connecting side 101 of the cover plate 11; the inner connecting section 502 (via a conductive copper sheet) is electrically connected to the tab connector 21. Further, the outer connecting section 501 and the inner connecting section 502 form a T-shaped structure; the inner connecting section 502 (with its mounting hole 503) is snapped or welded integrally with the conductive copper sheet; the conductive copper sheet is welded to the tab connector 21; this ensures the stability of the assembly, thereby improving the continuity and safety of use.

[0040] Specifically, in some implementations, such as Figure 3 and 4As shown, the electrode connector 21 includes a vertical connecting section 211 and a horizontal connecting section 212 that are connected to each other as one unit; the vertical connecting section 211 (through a conductive copper sheet) is electrically connected to the first electrode component 51 and / or the second electrode component 52 (inner connecting section 502); the horizontal connecting section 212 is provided with a mounting groove; the electrodes of the same polarity of the battery cell body 2 are connected (welded) to the inside of the mounting groove; to ensure the stability of the assembly, thereby improving the continuity and safety of use.

[0041] Specifically, in some implementations, such as Figure 1 and 4 As shown, the first temperature detection component 41 includes a temperature sensor 41 and a first sensing pin; the temperature sensor 41 is disposed between the first connecting side 101 and the battery cell body 2; the temperature sensor 41 (via a first electrical connection line along the inner wall of the housing 1) is electrically connected to the first sensing pin; the first sensing pin is connected to the second connecting side 102; and the second temperature detection component 42 includes a temperature sensor and a second sensing pin; the temperature sensor is disposed between the battery cell body 2 and the second connecting side 102, and abuts against the battery cell body 2; the temperature sensor (via a second electrical connection line) is electrically connected to the second sensing pin; the second sensing pin is connected to the second connecting side 102. Both the temperature sensor 41 and the temperature sensor are NTC sensors; both the first sensing pin and the second sensing pin are two-pin metal pins; the two-pin metal pin typically includes a signal output pin and a ground pin. Further, the specific models of the NTC sensor and the two-pin metal pin are selected according to the specific application, and are not limited here. In medicine, NTC usually refers to the "Negative Temperature Coefficient," describing the property of a material's resistance decreasing as temperature increases. This property is commonly used in temperature monitoring devices (such as electronic thermometers) or medical sensors to help achieve accurate temperature measurements. NTC Definition and Working Principle A: The resistance of NTC (Negative Temperature Coefficient) materials decreases significantly with increasing temperature. For example, when body temperature rises, the resistance of an NTC sensor decreases, and the device converts this resistance change into a temperature value. This characteristic makes it a core component of medical temperature measurement tools, especially suitable for scenarios requiring rapid response and high accuracy.

[0042] This utility model also proposes a power supply module, such as Figure 5 and 6As shown, the power module includes a battery body 100, a liquid cooling plate 6, a conductive connecting piece 7, and an adhesive component 8. The liquid cooling plate 6 is disposed at the bottom of the housing 1, and the polarity connector 5 is disposed between the liquid cooling plate 6 and the housing 1. The conductive connecting piece 7 is disposed between the liquid cooling plate 6 and the polarity connector 5. One side surface of the conductive connecting piece 7 is respectively connected to the polarity connector 5 of at least two battery bodies 100 to achieve series connection. The other side surface of the conductive connecting piece 7 is in contact with the liquid cooling plate 6. The adhesive component 8 connects the housing 1, the polarity connector 5, and the liquid cooling plate 6.

[0043] This structure allows for flip-chip assembly; the terminal surfaces of the battery cell face the liquid cooling plate to facilitate rapid heat transfer. Furthermore, the explosion-proof vents and valves are located at the top of the battery structure, enabling normal pressure relief and explosion prevention in the event of thermal runaway. In addition, the structure uses thermally conductive structural adhesive (adhesive component 8) to fill the gap between the battery cell terminals and the liquid cooling plate, primarily serving to fill the gap and improve thermal conductivity.

[0044] The battery body 100 is a battery structure, and the specific structure of the battery structure is as described in the above embodiments. Since this power module adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0045] The liquid cooling plate 6 has a liquid storage cavity inside; the liquid cooling plate 6 has an input pipe and an output pipe that communicate with the liquid storage cavity; the input pipe is used to communicate with the liquid pump and the liquid storage container; the output pipe is used to communicate with the liquid discharge pump and the circulation container.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0047] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A battery structure, characterized in that: The device includes a housing, a battery cell body, a first temperature detection component, and a second temperature detection component. The battery cell body is disposed inside the housing. The housing has a first connecting side and a second connecting side. A polarity connector is provided in the first connecting side. An explosion-proof hole is provided in the second connecting side. The second temperature detection component is connected to the second connecting side. The detection end of the second temperature detection component is disposed between the battery cell body and the second connecting side. The detection end of the first temperature detection component is disposed between the first connecting side and the battery cell body.

2. The battery structure according to claim 1, characterized in that: The housing includes a cover plate and a bottom shell connected to each other; the battery cell body is disposed between the cover plate and the bottom shell; the first connecting side is disposed on the surface of the cover plate away from the battery cell body; the second connecting side is disposed on the surface of the bottom shell away from the battery cell body; and the first connecting side and the second connecting side are respectively disposed opposite to each other on both sides of the battery cell body.

3. The battery structure according to claim 1 or 2, characterized in that: The polarity connector includes a first pole piece and a second pole piece with opposite polarities; the first pole piece and the second pole piece are respectively connected to the interior of the first connection side; at least two tab connectors are provided on one side of the battery cell body; the first pole piece and the second pole piece are respectively connected to two different tab connectors.

4. The battery structure according to claim 3, characterized in that: The first pole post component and / or the second pole post component include an outer connecting section and an inner connecting section that are connected to each other; the outer connecting section is connected to the interior of the first connecting side; the inner connecting section is electrically connected to the electrode tab connector.

5. The battery structure according to claim 3, characterized in that: The electrode connector includes a vertical connecting section and a horizontal connecting section that are connected to each other; the vertical connecting section is electrically connected to the first electrode component and / or the second electrode component; the horizontal connecting section is provided with a mounting groove; the battery cell body is connected to the interior of the mounting groove.

6. The battery structure according to claim 1, characterized in that: The first temperature detection component includes a temperature sensor and a first sensing pin; the temperature sensor is disposed between the first connection side and the battery cell body; the temperature sensor is electrically connected to the first sensing pin; the first sensing pin is connected to the second connection side.

7. The battery structure according to claim 1 or 6, characterized in that: The second temperature detection component includes a temperature detection element and a second sensing pin; the temperature detection element is disposed between the battery cell body and the second connection side and abuts against the battery cell body; the temperature detection element is electrically connected to the second sensing pin; the second sensing pin is connected to the second connection side.

8. A power supply module, characterized in that: The battery includes a battery body, a liquid cooling plate, and a conductive connecting piece; wherein the battery body is the battery structure described in any one of claims 1 to 7; the liquid cooling plate is disposed at the bottom of the housing, and the polarity connector is disposed between the liquid cooling plate and the housing; the conductive connecting piece is disposed between the liquid cooling plate and the polarity connector; and one side surface of the conductive connecting piece abuts against at least two of the polarity connectors in the battery body; the other side surface of the conductive connecting piece abuts against the liquid cooling plate.

9. The power supply module according to claim 8, characterized in that: The power module also includes an adhesive component; the adhesive component is connected between the housing, the polarity connector and the liquid cooling plate.

10. The power module according to claim 8 or 9, characterized in that: The liquid cooling plate has a liquid storage cavity; the liquid cooling plate has an input pipe and an output pipe that communicate with the liquid storage cavity; the input pipe is used to communicate with an external liquid pump and a liquid storage container; the output pipe is used to communicate with an external liquid discharge pump and a circulation container.

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