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 metal battery shell, an insulating coating and an identification part, the insulating coating is arranged on the outer surface of the metal battery shell, through holes are formed in the insulating coating so that one part of the outer surface of the metal battery shell can be exposed to form an exposed area, and the exposed area is used for being connected with a temperature collector in a heat conduction mode; the ratio of the area of the orthographic projection of the identification part in the exposed area to the area of the exposed area is larger than or equal to 0.5 and smaller than or equal to 0.98. The battery temperature collector is in heat conduction connection with the metal battery shell, and the temperature collector can accurately collect the temperature of the metal battery shell, so that the temperature of the battery is accurately collected, the use state of the battery is accurately pre-judged, and safety accidents such as overheating are avoided; even if the insulating coating is heated and melted, the identification part cannot be shielded, and follow-up information tracking of the battery is guaranteed. And the insulation effect of the insulation coating is not influenced.

Description

Technical Field

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

[0002] Currently, the overall electrochemical corrosion resistance of a battery can be increased by spraying an insulating coating on the outer surface of a metal battery case. However, the insulating coating reduces the heat dissipation efficiency of the metal battery case, resulting in a decrease in the accuracy of the temperature collected by a temperature collector disposed outside the battery; moreover, after the insulating coating melts due to heat, it is likely to block the identification portion, making it impossible to identify the battery.

[0003] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0004] The purpose of the present disclosure is to overcome the deficiencies of the above related technologies and provide a battery and a battery pack including the battery.

[0005] According to one aspect of the present disclosure, a battery is provided, including:

[0006] A metal battery case;

[0007] An insulating coating disposed on the outer surface of the metal battery case, the insulating coating being provided with through holes so that a part of the outer surface of the metal battery case is exposed to form an exposed area, and the exposed area is used for thermally connecting a temperature collector;

[0008] An identification portion disposed in the exposed area, the ratio of the area of the orthographic projection of the identification portion in the exposed area to the area of the exposed area being greater than or equal to 0.5 and less than or equal to 0.98.

[0009] For the battery of the present disclosure, on the one hand, the exposed area is used for thermally connecting the temperature collector, so that the temperature collector is thermally connected to the metal battery case. The temperature collector can accurately collect the temperature of the metal battery case, and then accurately collect the temperature of the battery, making an accurate pre-judgment on the usage state of the battery and avoiding safety accidents such as overheating; on the other hand, the ratio of the area of the orthographic projection of the identification portion in the exposed area to the area of the exposed area is greater than or equal to 0.5 and less than or equal to 0.98, which not only makes the distance between the edge of the identification portion and the edge of the exposed area appropriate, so that even if the insulating coating melts due to heat, it will not block the identification portion, ensuring subsequent information tracking of the battery; moreover, it makes the area of the exposed metal battery case appropriate and does not affect the insulating effect of the insulating coating.

[0010] According to another aspect of the present disclosure, a battery pack is provided, including:

[0011] The battery, the battery described above;

[0012] The temperature collector is thermally connected to the exposed area of the metal battery housing.

[0013] On the one hand, for the battery pack of the present disclosure, the exposed area is thermally connected to the temperature collector, so that the temperature collector is thermally connected to the metal battery housing. The temperature collector can accurately collect the temperature of the metal battery housing, and then accurately collect the temperature of the battery, accurately predict the usage status of each battery, avoid safety accidents such as overheating, and ensure the safety of the battery pack. On the other hand, the ratio of the area of the orthographic projection of the identification part on the exposed area to the area of the exposed area is greater than or equal to 0.5 and less than or equal to 0.98. This not only makes the distance between the edge of the identification part and the edge of the exposed area appropriate, so that even if the insulating coating melts due to heat, it will not block the identification part, ensuring subsequent information tracking of the battery; but also makes the area of the exposed metal battery housing appropriate, without affecting the insulation effect of the insulating coating, so as to ensure the safety of the battery pack.

[0014] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic three-dimensional structure diagram of an exemplary embodiment of the battery of the present disclosure.

[0017] Figure 2 It is Figure 1 the cross-sectional view of the battery in

[0018] Figure 3 It is a schematic three-dimensional structure diagram of an exemplary embodiment of the battery pack of the present disclosure.

[0019] Figure 4 It is Figure 3 the partial cross-sectional view taken along the A-A section in

[0020] Description of the reference numerals:

[0021] 1. Metal battery housing; 11. Exposed area; 12. Side plate; 13. Cover plate; 14. Bottom wall plate;

[0022] 2. Insulating coating; 21. Through hole;

[0023] 3. Identification part;

[0024] 4. Battery cell; 41. Body part; 42. First tab; 43. Second tab;

[0025] 51. First battery terminal; 52. Second battery terminal;

[0026] 10. Battery; 20. Temperature collector; 30. Buffer structure. Detailed implementation manners

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed descriptions will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0028] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification only for convenience, for example, according to the directions of the examples described in the accompanying drawings. It can be understood that if the device of the icon is turned upside down, the component described as "upper" will become the component described as "lower". When a structure is "on" another structure, it may mean that a structure is integrally formed on another structure, or that a structure is "directly" disposed on another structure, or that a structure is "indirectly" disposed on another structure through another structure.

[0029] The terms "a", "one", "the", "said" and "at least one" are used to indicate the existence of one or more elements / components / etc.; the terms "comprising" and "having" are used to mean an open inclusion and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc.; the terms "first", "second", "third", etc. are used only as labels and are not a limitation on the quantity of their objects.

[0030] In this application, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral one; it can be directly connected or indirectly connected through an intermediate medium. "And / or" is merely a description of the associated relationship of associated objects and indicates that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0031] The exemplary embodiments of the present disclosure provide a battery. Referring to Figures 1-4 as shown, the battery may include a metal battery housing 1, an insulating coating 2, and an identification portion 3. The insulating coating 2 is provided on the outer surface of the metal battery housing 1. The insulating coating 2 is provided with a through hole 21 to expose a part of the outer surface of the metal battery housing 1 to form an exposed area 11. The exposed area 11 is used for thermally connecting a temperature collector 20. The identification portion 3 is provided on the exposed area 11. The ratio of the area of the orthographic projection of the identification portion 3 on the exposed area 11 to the area of the exposed area 11 is greater than or equal to 0.5 and less than or equal to 0.98.

[0032] For the battery of the present disclosure, on the one hand, the exposed area 11 is used for thermally connecting the temperature collector 20, so that the temperature collector 20 is thermally connected to the metal battery housing 1. The temperature collector 20 can accurately collect the temperature of the metal battery housing 1, and then accurately collect the temperature of the battery, so as to accurately predict the usage state of the battery and avoid safety accidents such as overheating. On the other hand, it not only makes the distance between the edge of the identification portion 3 and the edge of the exposed area 11 appropriate, so that even if the insulating coating 2 melts due to heat, it will not block the identification portion 3, ensuring subsequent information tracking of the battery; but also makes the area of the exposed metal battery housing 1 appropriate, without affecting the insulation effect of the insulating coating 2.

[0033] In the exemplary embodiment, the single battery may be a quadrangular prism battery. Referring to Figure 1 as shown, the metal battery housing 1 of the quadrangular prism battery may be configured as a cuboid structure. Specifically, the metal battery housing 1 may include six wall plates, which are a cover plate 13, a bottom wall plate 14, and four side plates 12 respectively. The four side plates 12 are arranged in pairs opposite to each other; the four side plates 12 are sequentially connected end to end to form a cuboid tube. A bottom wall plate 14 is connected to one side of the four side plates 12, and a cover plate 13 is connected to the opposite side of the four side plates 12, so that the cover plate 13, the bottom wall plate 14, and the four side plates 12 surround to form a receiving cavity.

[0034] Of course, in some other exemplary embodiments of the present disclosure, the bottom wall plate 14 and the cover plate 13 may be configured as circular, elliptical, other polygons, etc. The side plates 12 may be provided as one or more, and surround to form a cylinder, an elliptical cylinder, other polygon cylinders, etc., so that the metal battery housing 1 is formed into a cylindrical shape, an elliptical cylindrical shape, other polygon columnar shapes, etc., and the single battery is a cylindrical battery, an elliptical cylindrical battery, other polygon prism batteries, etc.

[0035] The material of the metal battery housing 1 may be stainless steel (SUS304), cold-rolled carbon steel (SPCC / SPCE), copper, titanium, nickel, chromium, aluminum, or aluminum alloy, etc. Of course, it may also be other materials, which will not be elaborated here one by one.

[0036] In the present exemplary embodiment, referring to Figure 2 As shown, an insulating coating 2 is coated on the outer surface of the metal battery housing 1, that is, on the outer surfaces of the cover plate 13, the bottom wall plate 14, and the four side plates 12, so that the cover plate 13, the bottom wall plate 14, and the four side plates 12 are all two-layer structures including a metal layer and an insulating layer.

[0037] The metal battery housing 1 and the insulating coating 2 may be an integrally formed structure, that is, the metal battery housing 1 and the insulating coating 2 are formed by an integral forming process. For example, an insulating film may be formed on a metal plate by processes such as spraying and coating, and then the insulating film and the metal plate are simultaneously subjected to a stamping process or a stretching process, so that the insulating film and the metal plate form a battery housing with a receiving cavity, that is, the metal plate forms the metal battery housing 1, and the insulating film forms the insulating coating 2. The integrally formed structure makes the connection between the metal battery housing 1 and the insulating coating 2 tighter, and there is almost no gap between the metal battery housing 1 and the insulating coating 2. Moreover, the preparation process is relatively simple, which is beneficial to improving efficiency.

[0038] Of course, in some other exemplary embodiments of the present disclosure, the metal battery housing 1 and the insulating coating 2 may be a separately formed structure. For example, the metal plate may be first subjected to a stamping process or a stretching process to form a metal battery housing 1 with a receiving cavity, and then an insulating coating 2 is formed on the metal battery housing 1 by processes such as spraying and coating.

[0039] The material of the insulating coating 2 may be a polymer or a resin. For example, the material of the insulating coating 2 may be polyethylene (PE), polytetrafluoroethylene (PTFE), polypropylene (PP), polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), LCP plastic raw material (LIQUID CRYSTAL POLYMER, also known as liquid crystal polymer), soluble polytetrafluoroethylene (PFA), acrylonitrile-butadiene-styrene copolymer (ABS), polyphenylene sulfide (PPS), and so on.

[0040] The material of the insulating coating 2 may also be an inorganic non-metallic material. For example, the material of the insulating coating 2 may be Al2O3, SiC, SiO2, and so on.

[0041] The electrochemical corrosion resistance of the overall battery can be increased through the insulating coating 2 to improve the service life of the battery.

[0042] In the present exemplary embodiment, referring to Figure 2 and Figure 4As shown, the insulating coating 2 is provided with through holes 21 to expose a part of the outer surface of the metal battery case 1 to form an exposed area 11, that is, a part of the outer surface of the metal battery case 1 is not coated with the insulating coating 2, so that a part of the metal on the outer surface of the metal battery case 1 is exposed to form the exposed area 11.

[0043] The exposed area 11 is used for thermally connecting the temperature collector 20, so that the temperature collector 20 is thermally connected to the metal battery case 1. The temperature collector 20 can accurately collect the temperature of the metal battery case 1, and then accurately collect the temperature of the battery, and accurately predict the usage state of the battery to avoid safety accidents such as overheating.

[0044] In the present exemplary embodiment, referring to Figure 2 and Figure 4 As shown, the identification portion 3 is provided on the exposed area 11. For example, the identification portion 3 can be directly attached to the metal battery case 1. Even if the insulating coating 2 is heated and melted, the melted insulating coating 2 will not block the identification portion 3, so that the identification portion 3 can be recognized, and then each battery can be identified.

[0045] The identification portion 3 serves as a mark of the battery and can identify battery information (such as model, production date, rated current, rated voltage, etc.). It is convenient for the battery manufacturer to track and identify the battery later. The identification portion can be formed by means of inkjet printing, etching, etc.; the identification portion can be at least one of two-dimensional codes, numbers, letters, or other forms.

[0046] Moreover, the ratio of the area of the orthographic projection of the identification portion 3 on the exposed area 11 to the area of the exposed area 11 is greater than or equal to 0.5 and less than or equal to 0.98. For example, the ratio of the area of the orthographic projection of the identification portion 3 on the exposed area 11 to the area of the exposed area 11 can be 0.53, 0.55, 0.58, 0.6, 0.62, 0.65, 0.67, 0.7, 0.73, 0.75, 0.78, 0.8, 0.82, 0.85, 0.87, 0.9, 0.93, 0.95, etc.

[0047] Generally, the area of the identification portion 3 can be set; if the ratio of the area of the orthographic projection of the identification portion 3 on the exposed area 11 to the area of the exposed area 11 is too large, the area of the exposed area 11 is too small, and the edge of the identification portion 3 is too close to the edge of the exposed area 11, the melted insulating coating 2 will still block the identification portion 3 after heating, affecting the subsequent information tracking of the battery.

[0048] If the ratio of the area of the orthographic projection of the identification portion 3 on the exposed area 11 to the area of the exposed area 11 is too small, the area of the exposed area 11 is too large, and the area of the exposed metal battery case 1 is too large, which is likely to affect the insulation effect of the insulating coating 2 and easily cause battery insulation failure.

[0049] The above numerical range not only makes the distance between the edge of the identification part 3 and the edge of the exposed area 11 appropriate, so that even if the insulating coating 2 melts due to heat, it will not block the identification part 3, ensuring the subsequent information tracking of the battery; but also makes the area of the exposed metal battery case 1 appropriate without affecting the insulation effect of the insulating coating 2.

[0050] In the present exemplary embodiment, referring to Figure 2 as shown, the wall thickness H1 of the metal battery case 1 is greater than or equal to 0.05 mm and less than or equal to 0.35 mm. For example, the wall thickness H1 of the metal battery case 1 can be 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.17 mm, 0.2 mm, 0.23 mm, 0.25 mm, 0.28 mm, 0.3 mm, 0.32 mm, etc.

[0051] If the wall thickness H1 of the metal battery case 1 is too large, it will cause the weight and volume of the metal battery case 1 to be too large, which is not conducive to improving the energy density and space utilization rate of the battery.

[0052] If the wall thickness H1 of the metal battery case 1 is too small, it will cause the strength of the metal battery case 1 to be too small to meet the strength requirements of the battery and cannot play a role in supporting and protecting the battery cell 4 inside.

[0053] The above numerical range not only ensures that the strength of the metal battery case 1 can meet the requirements and can play a role in supporting and protecting the battery cell 4 inside; but also is conducive to improving the energy density and space utilization rate of the battery.

[0054] In some exemplary embodiments of the present disclosure, referring to Figure 2 as shown, the thickness H2 of the insulating coating 2 is greater than or equal to 0.1 mm and less than or equal to 2 mm. For example, the thickness H2 of the insulating coating 2 can be 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, etc.

[0055] Since the heat dissipation efficiency of the insulating coating 2 is not good, if the thickness H2 of the insulating coating 2 is too large, the insulating coating 2 will have a great impact on the heat dissipation efficiency of the battery, resulting in the heat generated by the battery cell 4 not being dissipated in time, making the battery prone to overheating.

[0056] If the thickness H2 of the insulating coating 2 is too small, the strength of the insulating coating 2 will be low, and the insulating coating 2 is prone to breakage, thereby affecting the insulation effect of the insulating coating 2 and resulting in poor insulation effect of the battery.

[0057] The above numerical range ensures that the insulating coating 2 will not affect the heat dissipation efficiency of the battery to ensure the heat dissipation efficiency of the battery; and the insulating coating 2 is not prone to breakage to ensure the insulation effect of the battery.

[0058] In this exemplary embodiment, referring to Figure 2 as shown, the ratio of the wall thickness H1 of the metal battery housing 1 to the thickness H2 of the insulating coating 2 is greater than or equal to 0.06 and less than or equal to 2.8. For example, the ratio of the wall thickness of the metal battery housing 1 to the thickness of the insulating coating 2 can be 0.2, 0.5, 0.7, 1, 1, 1.3, 1.5, 1.8, 2, 2.2, 2.5, etc.

[0059] To ensure the space utilization rate and energy density of the battery, the wall thickness of the battery housing including the metal battery housing 1 and the insulating coating 2 is substantially the same as the wall thickness of the battery housing including only the metal layer, that is, the sum of the wall thickness H1 of the metal battery housing 1 and the thickness H2 of the insulating coating 2 is generally a fixed value.

[0060] If the ratio of the wall thickness H1 of the metal battery housing 1 to the thickness H2 of the insulating coating 2 is too large, the thickness H2 of the insulating coating 2 is too small, resulting in a low strength of the insulating coating 2, and the insulating coating 2 is prone to breakage, thereby affecting the insulating effect of the insulating coating 2 and causing poor insulating effect of the battery.

[0061] If the ratio of the wall thickness H1 of the metal battery housing 1 to the thickness H2 of the insulating coating 2 is too small, the wall thickness H1 of the metal battery housing 1 is too small, resulting in too small a strength of the metal battery housing 1, which cannot meet the strength requirements of the battery and cannot play a role in supporting and protecting the battery cell 4 therein.

[0062] The above numerical range not only ensures that the insulating coating 2 is not easily damaged to ensure the insulating effect of the battery, but also ensures that the strength of the metal battery housing 1 can meet the requirements and can play a role in supporting and protecting the battery cell 4 therein.

[0063] The identification part 3 is at least one of a two-dimensional code, numbers, and letters. For example, the identification part 3 can be a two-dimensional code, numbers, or letters, the identification part 3 can also be a combination of any two of the two-dimensional code, numbers, and letters, and the identification part 3 can also be a combination of the two-dimensional code, numbers, and letters.

[0064] In this exemplary embodiment, referring to Figure 2 as shown, a battery cell 4 is disposed in the accommodation cavity of the battery housing. The battery cell 4 is arranged as a cuboid adapted to the battery housing, and the battery cell 4 is the smallest unit for charging and discharging of a single battery.

[0065] The battery cell 4 may include a body portion 41 and a pole ear portion; the body portion 41 may include a first pole piece, a separator and a second pole piece (not shown in the figure) arranged in a stacked manner, that is, the battery cell 4 may include a plurality of first pole pieces and second pole pieces arranged in a stacked manner, and a separator arranged between the first pole piece and the second pole piece, and the battery cell 4 is a stacked type. The battery cell 4 may also be a wound type, and the stacked structure formed by the first pole piece, the separator and the second pole piece is wound to form a wound type battery cell 4. Different active materials are coated on the first pole piece and the second pole piece.

[0066] The polarity of the first electrode is opposite to the polarity of the second electrode. For example, the first electrode can be a positive electrode and the second electrode can be a negative electrode. Of course, the first electrode can also be a negative electrode and the second electrode can be a positive electrode. The following description is based on the example that the first electrode is a positive electrode and the second electrode is a negative electrode.

[0067] The tab portion may include a first tab 42 and a second tab 43. The first tab 42 and the second tab 43 may be led out from the same side of the body portion 41, for example, the first tab 42 and the second tab 43 may be led out from a first end surface of the body portion 41.

[0068] Specifically, the first pole ear 42 is connected to the first pole piece, and the first pole ear 42 is located on the side of the first end face away from the main body 41; a part of the first pole piece may extend out of the main body 41 and be bent to the side of the first end face away from the main body 41 to form the first pole ear 42.

[0069] The second pole ear 43 is connected to the second pole piece and is located on the side of the first end surface away from the main body 41 . The second pole ear 43 may be formed by a portion of the second pole piece extending out of the main body 41 and being bent to the side of the first end surface away from the main body 41 .

[0070] It should be noted that the first pole tab 42 and the second pole tab 43 are conductive foil areas without active material coating, that is, no active material coating is coated on the first pole tab 42 and the second pole tab 43 , and they are current collecting layers for transmitting current.

[0071] The first pole lug 42 can be connected to the first battery pole 51 so that the first battery pole 51 can form the positive electrode of the battery; the second pole lug 43 can be connected to the second battery pole 52 so that the second battery pole 52 can form the negative electrode of the battery.

[0072] Based on the same inventive concept, the exemplary embodiment of the present disclosure provides a battery pack, referring to Figure 3 and Figure 4As shown, the battery pack may include a battery 10 and a temperature collector 20; the temperature collector 20 is attached to the exposed area 11 of the metal battery case 1; the battery 10 is the battery described in any of the above; the specific structure of the battery 10 has been described in detail above, so it will not be elaborated here.

[0073] For the battery pack of the present disclosure, on the one hand, the exposed area 11 is thermally connected to the temperature collector 20, so that the temperature collector 20 is thermally connected to the metal battery case 1. The temperature collector 20 can accurately collect the temperature of the metal battery case 1, and then accurately collect the temperature of the battery, so as to accurately predict the usage status of each battery and avoid safety accidents such as overheating, thereby ensuring the safety of the battery pack; on the other hand, not only is the distance between the edge of the identification part 3 and the edge of the exposed area 11 appropriate, so that even if the insulating coating 2 melts due to heat, it will not block the identification part 3, ensuring subsequent information tracking of the battery; moreover, the area of the exposed metal battery case 1 is appropriate, which will not affect the insulating effect of the insulating coating 2, so as to ensure the safety of the battery pack.

[0074] The temperature collector 20 can be an NTC temperature sensor. The NTC temperature sensor is a kind of thermistor and probe, and its principle is that the resistance value decreases rapidly as the temperature rises. It is usually composed of two or three metal oxides, mixed in a clay-like fluid, and fired into a dense sintered ceramic in a high-temperature furnace. The NTC temperature sensor has the characteristics of high sensitivity, fast response speed, good consistency and interchangeability.

[0075] Of course, the temperature collector 20 can also be other thermal resistance sensors, thermocouple sensors, etc., which will not be elaborated here one by one.

[0076] In the present exemplary embodiment, the battery pack may further include a buffer structure 30. The buffer structure 30 is disposed between the temperature collector 20 and the battery. The buffer structure 30 has a certain elasticity, so that the buffer structure 30 can be compressed, and the vibration transmission between the temperature collector 20 and the battery can be reduced through the buffer structure 30.

[0077] In the present exemplary embodiment, the elastic modulus of the buffer structure 30 is greater than or equal to 1 MPa and less than or equal to 500 MPa. For example, the elastic modulus of the buffer structure 30 can be 30 MPa, 50 MPa, 80 MPa, 100 MPa, 120 MPa, 150 MPa, 170 MPa, 200 MPa, 230 MPa, 250 MPa, 280 MPa, 300 MPa, 320 MPa, 350 MPa, 370 MPa, 400 MPa, 430 MPa, 450 MPa, 480 MPa, etc.

[0078] The elastic modulus refers to the stress required for a material to produce unit elastic deformation under the action of an external force. The elastic modulus can be regarded as an index to measure the ease of producing elastic deformation of a material. The larger its value, the greater the stress required to cause a certain elastic deformation of the material, that is, the greater the stiffness of the material. In other words, under a certain stress, the elastic deformation is smaller.

[0079] If the elastic modulus of the buffer structure 30 is too large, it is difficult for the buffer structure 30 to produce elastic deformation, and the vibration received by the battery will still be transmitted to the temperature collector 20, which easily leads to the connection failure between the temperature collector 20 and the metal battery case 1, resulting in inaccurate temperature collected by the temperature collector 20.

[0080] If the elastic modulus of the buffer structure 30 is too small, it is easy for the buffer structure 30 to produce elastic deformation, and the stability of fixing the temperature collector 20 is not high.

[0081] The above numerical range not only ensures better stability of fixing the temperature collector 20, but also ensures that the vibration received by the battery is basically not transmitted to the temperature collector 20, ensuring the stability of the connection between the temperature collector 20 and the metal battery case 1, and making the temperature collected by the temperature collector 20 accurate.

[0082] In the present exemplary embodiment, the ratio of the elastic modulus of the buffer structure 30 to the wall thickness of the metal battery case 1 is greater than or equal to 4 MPa / mm and less than or equal to 1000 MPa / mm. For example, the ratio of the elastic modulus of the buffer structure 30 to the wall thickness of the metal battery case 1 can be 50 MPa / mm, 100 MPa / mm, 150 MPa / mm, 200 MPa / mm, 250 MPa / mm, 300 MPa / mm, 350 MPa / mm, 400 MPa / mm, 450 MPa / mm, 500 MPa / mm, 550 MPa / mm, 600 MPa / mm, 650 MPa / mm, 700 MPa / mm, 750 MPa / mm, 800 MPa / mm, 850 MPa / mm, 900 MPa / mm, 950 MPa / mm, etc.

[0083] If the ratio of the elastic modulus of the buffer structure 30 to the wall thickness of the metal battery case 1 is too large, the elastic modulus of the buffer structure 30 is too large, it is difficult for the buffer structure 30 to produce elastic deformation, and the vibration received by the battery will still be transmitted to the temperature collector 20, which easily leads to the connection failure between the temperature collector 20 and the metal battery case 1, resulting in inaccurate temperature collected by the temperature collector 20.

[0084] If the ratio of the elastic modulus of the buffer structure 30 to the wall thickness of the metal battery case 1 is too small, the elastic modulus of the buffer structure 30 is too small, and it is easy for the buffer structure 30 to produce elastic deformation, and the stability of fixing the temperature collector 20 is not high.

[0085] The above numerical range not only ensures better stability of the fixation of the temperature collector 20, but also ensures that the vibration received by the battery is basically not transmitted to the temperature collector 20, ensuring the stability of the connection between the temperature collector 20 and the metal battery housing 1, and making the temperature collected by the temperature collector 20 accurate.

[0086] In the present exemplary embodiment, the thickness H3 of the buffer structure 30 is greater than or equal to 1 mm and less than or equal to 10 mm. For example, the thickness H3 of the buffer structure 30 can be 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, etc.

[0087] If the thickness H3 of the buffer structure 30 is too small, the buffer structure 30 cannot play a role in buffering the vibration transmitted by the battery, resulting in the vibration received by the battery being transmitted to the temperature collector 20, which easily causes the connection between the temperature collector 20 and the metal battery housing 1 to fail, and making the temperature collected by the temperature collector 20 inaccurate.

[0088] If the thickness H3 of the buffer structure 30 is too large, the distance between the temperature collector 20 and the metal battery housing 1 is relatively far, and the accuracy of the temperature collected by the temperature collector 20 is reduced.

[0089] The above numerical range not only ensures that the buffer structure 30 can play a role in buffering the vibration transmitted by the battery, the vibration received by the battery is basically not transmitted to the temperature collector 20, ensuring the stability of the connection between the temperature collector 20 and the metal battery housing 1, and making the temperature collected by the temperature collector 20 accurate; moreover, it makes the distance between the temperature collector 20 and the metal battery housing 1 relatively close to ensure the accuracy of the temperature collected by the temperature collector 20.

[0090] In the present exemplary embodiment, the thermal conductivity of the buffer structure 30 is greater than or equal to 0.2 W / (m·K) and less than or equal to 10 W / (m·K). For example, the thermal conductivity of the buffer structure 30 can be 0.5 W / (m·K), 1 W / (m·K), 1.5 W / (m·K), 2 W / (m·K), 2.5 W / (m·K), 3 W / (m·K), 3.5 W / (m·K), 4 W / (m·K), 4.5 W / (m·K), 5 W / (m·K), 5.5 W / (m·K), 6 W / (m·K), 6.5 W / (m·K), 7 W / (m·K), 7.5 W / (m·K), 8 W / (m·K), 8.5 W / (m·K), 9 W / (m·K), 9.5 W / (m·K), etc.

[0091] If the thermal conductivity of the buffer structure 30 is too small, the heat generated by the battery cannot be transferred to the temperature collector 20 in time, resulting in inaccurate temperature collected by the temperature collector 20.

[0092] If the thermal conductivity of the buffer structure 30 is too large, it is not conducive to the selection of the material of the buffer structure 30, making the cost of the buffer structure 30 relatively high, thus increasing the cost of the battery.

[0093] The above numerical range not only ensures that the heat generated by the battery can be transferred to the temperature collector 20 in time, making the temperature collected by the temperature collector 20 relatively accurate; but also makes the selection of the material of the buffer structure 30 relatively easy and does not increase the cost of the battery.

[0094] The material of the buffer structure 30 can be thermally conductive silicone, thermally conductive gel, thermally conductive double-sided tape, thermally conductive potting glue, etc. The temperature collector 20 can be directly bonded to the exposed area 11 of the metal battery case 1 through the buffer structure 30.

[0095] The "parallel" and "perpendicular" mentioned in this application can not only be completely parallel and perpendicular, but also have a certain error; for example, if the included angle between the two is greater than or equal to 0° and less than or equal to 5°, it is considered that the two are parallel to each other; if the included angle between the two is greater than or equal to 85° and less than or equal to 95°, it is considered that the two are perpendicular to each other.

[0096] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only considered exemplary, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

Claims

1. A battery, characterized in that: include: Metal battery casing; An insulating coating is provided on the outer surface of the metal battery shell, wherein the insulating coating is provided with through holes to expose a portion of the outer surface of the metal battery shell to form an exposed area, and the exposed area is used for thermal connection to a temperature collector; The marking portion is arranged in the exposed area, and the ratio of the area of ​​the positive projection of the marking portion on the exposed area to the area of ​​the exposed area is greater than or equal to 0.5 and less than or equal to 0.

98.

2. The battery according to claim 1, characterized in that The wall thickness of the metal battery casing is greater than or equal to 0.05 mm and less than or equal to 0.35 mm, and / or the thickness of the insulating coating is greater than or equal to 0.1 mm and less than or equal to 2 mm.

3. The battery according to claim 1, characterized in that The ratio of the wall thickness of the metal battery shell to the thickness of the insulating coating is greater than or equal to 0.06 and less than or equal to 2.

8.

4. A battery pack, characterized in that: include: A battery, which is a battery according to any one of claims 1 to 3; The temperature collector is thermally connected to the exposed area of ​​the metal battery shell.

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