CN218602669U - Secondary battery and battery pack - Google Patents

Abstract

The embodiment of the application discloses secondary battery and battery package, secondary battery is through setting up the bulge that two at least intervals were arranged on the insulating part in order to form exhaust passage for electrode subassembly terminal surface and explosion-proof valve on length direction switch on, thereby make the gas that produces at the electrode subassembly during operation, discharge from electrode subassembly's terminal surface, and discharge to explosion-proof valve place region via exhaust passage, then discharge through explosion-proof valve, promote electrode subassembly's life, guarantee secondary battery's safe handling.

Description

Secondary battery and battery pack

Technical Field

The present application relates to the field of battery technology, and in particular, to a secondary battery and a battery pack.

Background

With the development of science and technology, secondary batteries are widely used in portable electronic devices such as mobile phones, digital cameras, and portable computers, and have a wide application prospect in electric vehicles such as electric automobiles and electric bicycles, and large and medium-sized electric devices such as energy storage facilities, and become an important technical means for solving global problems such as energy crisis and environmental pollution.

The conventional secondary battery has a case and a top cover forming a sealed space in which an electrode assembly, an electrolyte, an active material, an insulating film, and other components and various materials required for electrochemical energy conversion are contained. The electrode assembly can slowly generate gas in the normal use process, when the internal gas pressure of the electrode assembly reaches a certain degree, the explosion-proof valve on the top cover can be opened, and the gas can be sprayed out from the explosion-proof valve.

However, in the conventional secondary battery, the gas path leading the gas generated by the electrode assembly to the explosion-proof valve is not smooth, so that the gas cannot be discharged from the explosion-proof valve in time, and the safe use of the secondary battery is influenced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a secondary battery and a battery pack, and can solve the problem that gas generated by an electrode assembly in the conventional secondary battery cannot smoothly circulate to an explosion-proof valve.

An embodiment of the present application provides a secondary battery, including: a housing provided with an opening, the housing having a length direction and a height direction orthogonal to the length direction; the top cover assembly is arranged on the opening in a covering mode and comprises a top cover plate and an explosion-proof valve arranged on the top cover plate; further comprising: the insulating piece is arranged in the shell, the insulating piece and the top cover plate are overlapped along the height direction, one surface of the insulating piece, which is far away from the top cover plate, is provided with at least two convex parts, and the at least two convex parts form an exhaust channel at intervals; and at least one electrode assembly provided in the case along the length direction, the electrode assembly having two end faces oppositely disposed along the length direction; wherein the gas generated by the electrode assembly is discharged from the end face and is discharged to the explosion-proof valve through the gas discharge passage.

Meanwhile, the embodiment of the application also provides a battery pack which comprises the secondary battery.

The utility model provides a secondary battery and have this secondary battery's battery package, secondary battery is through setting up the bulge that two at least intervals were arranged in order to form exhaust passage on the insulating part for electrode subassembly terminal surface and explosion-proof valve on length direction switch on, thereby make the gas that produces at the electrode subassembly during operation, discharge from electrode subassembly's terminal surface, and discharge to explosion-proof valve place region via exhaust passage, then discharge through explosion-proof valve, promote electrode subassembly's life, guarantee secondary battery's safe handling.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of a secondary battery provided in an embodiment of the present application;

FIG. 2 is a schematic view of the exploded structure of FIG. 1;

FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 1;

fig. 4 is a schematic structural view of a secondary battery provided in an embodiment of the present application with a case removed;

fig. 5 is a schematic view illustrating a structure of an insulating member in a secondary battery according to an embodiment of the present application;

FIG. 6 is a front view of FIG. 5;

fig. 7 is a schematic structural view of a frame in a secondary battery according to another embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a pin in a secondary battery according to another embodiment of the present application.

Wherein the arrow direction in fig. 3 indicates the exhaust direction of the electrode assembly.

Description of reference numerals:

100. a secondary battery, 110, a case, 111, an opening, 120, a top cap assembly, 121, a top cap plate, 122, an explosion-proof valve, 123, a pin, 1231, a connection part, 1232, a lead-out part, 1233, a bridging part, 124, a pole, 130, an insulating member, 131, a protrusion, 131a, a protrusion group, 132, an exhaust channel, 133, a protrusion, 134, an insertion hole, 140, an electrode assembly, 141, an end face, 142, a body, 143, a tab, 150, a frame body, 151, a first support frame, 152, a second support frame, 153, a connection part, 1531, a first end face, 1532, a second end face, 1533, a third end face, 1534, a fourth end face, 154, an exhaust cavity, 155, a first air inlet, 156, and a third air inlet;

x, length direction, Y, width direction, Z, height direction.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features.

The embodiment of the application provides a secondary battery and have this secondary battery's battery package, secondary battery is through setting up the bulge that two at least intervals were arranged in order forming exhaust passage on the insulating part for electrode subassembly terminal surface and explosion-proof valve on length direction switch on, thereby make the gas that produces at the electrode subassembly during operation, discharge from electrode subassembly's terminal surface, and discharge to the explosion-proof valve place region via exhaust passage, then discharge through explosion-proof valve, promote electrode subassembly's life, guarantee secondary battery's safe handling. As a typical application, a battery pack including the secondary battery may be used to supply power to electric devices such as electric automobiles.

In an embodiment of the present application, referring to fig. 1 to 6, there is provided a secondary battery 100, the secondary battery 100 including: a case 110, a cap assembly 120, an insulator 130, and an electrode assembly 140.

Referring to fig. 1 to 3, the housing 110 has a longitudinal direction X, a height direction Z orthogonal to the longitudinal direction X, and a width direction Y orthogonal to the longitudinal direction X, the housing 110 has an upper surface and a lower surface which are oppositely disposed along the height direction Z, and the upper surface of the housing 110 is provided with an opening 111.

Referring to fig. 1 to 4, the cap assembly 120 includes: the top cover part 121 covers the opening 111 to define a containing cavity for containing the electrode assembly 140 therebetween, the containing cavity is filled with electrolyte, and the explosion-proof valve 122 is disposed on the top cover part 121, specifically, the explosion-proof valve 122 is disposed in the middle of the top cover part 121 in the length direction.

Referring to fig. 2 to 6, the insulating member 130 is disposed in the housing 110, the insulating member 130 and the top cover 121 are stacked along the height direction Z, the insulating member 130 is made of a plastic material, the main body of the insulating member 130 is shaped as a plate body, and is matched with the size of the top cover 121, one side of the insulating member 130 away from the top cover 121 is provided with at least two protruding portions 131 in a protruding manner, in this embodiment, the at least two protruding portions 131 are arranged at intervals along the width direction Y of the housing 110, and an exhaust channel 132 is formed between the two protruding portions 131. Specifically, in the present embodiment, the number of the protrusions 131 is four, two protrusions 131a are formed in two groups, and two groups of protrusions are arranged at intervals on two sides of the explosion-proof valve 122 along the length direction X of the housing 110. In other implementations, the number of the protrusions 131 in each protrusion group 131a may be three or four, and the protrusions are spaced along the width direction Y of the housing 110, and an exhaust channel 132 is formed between two adjacent protrusions 131, for example, if three protrusions 131 are provided at one end of the insulating member 130 in the length direction X, two exhaust channels 132 spaced along the width direction Y may be formed at the end of the insulating member 130, so as to increase the number of the exhaust channels 132. In other implementations, the number of the protrusions 131 in two sets of the protrusion sets 131a may be the same, for example, the number of the protrusions 131 in each set of the protrusion sets 131a is two, and the number of the protrusions 131 in two sets of the protrusion sets 131a may also be different, for example, the number of the protrusions 131 in one set of the protrusion sets 131a is two, and the number of the protrusions 131 in the other set of the protrusion sets 131a is three.

In addition, the opposite surfaces of two adjacent protrusions 131 arranged along the width direction Y are respectively arranged to be inclined surfaces, that is, the thickness of the protrusion 131 in the width direction Y is gradually reduced from one end of the protrusion 131 far away from the explosion-proof valve 122 to the end close to the explosion-proof valve 122, so that the exhaust channel 132 forms a jet flow channel, the flow rate of the air flow in the exhaust channel 132 is increased, and the exhaust effect is improved.

In addition, referring to fig. 5 and 6, each of the protrusions 131 is provided with a plurality of through holes along the height direction Z of the housing 110, a protrusion 133 is disposed on a surface of the insulating member 130 away from the top cover sheet 121, the protrusions 133 are arranged along the width direction Y of the housing 110, the protrusions 133 are overlapped with the explosion-proof valve 122 along the height direction Z of the housing 110, the protrusions 133 form a support for the explosion-proof valve 122, and the protrusions 133 are provided with through holes. Insulating part 130 can be structure as an organic whole, insulating part 130 of integrative structure is convenient for whole injection moulding, promote production efficiency, insulating part 130 also can be for the components of a whole that can function independently structure, in this embodiment, insulating part 130 is the components of a whole that can function independently structure, specifically, form by first portion and second part along length direction X concatenation, first portion sets up a set of bulge group 131a, the second portion sets up another set of bulge group 131a and bellying 133, the design of components of a whole that can function independently structure is convenient for process and assemble, the subsequent maintenance of also being convenient for.

Referring to fig. 2 to 4, the electrode assembly 140 is disposed in the case 110 along a length direction X of the case 110, specifically, the electrode assembly 140 is disposed in an accommodating cavity defined by the top cover plate 121 and the case 110 along the length direction X of the case 110, the electrode assembly 140 has two end surfaces 141 oppositely disposed along the length direction X of the case 110, the electrode assembly 140 includes a body 142 and tabs 143, the body 142 is disposed along the length direction X, the body 142 is formed by winding a positive electrode sheet, a negative electrode sheet and a separator, the two end surfaces of the body 142 in the length direction X are end surfaces 141 forming the electrode assembly 140, the tabs 143 are welded to the body 142, and the tabs 143 are disposed on the end surfaces 141. In the present embodiment, the projection group 131a is disposed adjacent to the end surface 141 in the length direction X, and the electrode assemblies 140, the number of which is four, are stacked in the height direction Z of the case 110 to form an electrode assembly group having upper and lower sides oppositely disposed in the height direction Z, the upper side being in contact with the projection 131. The shape of the case 110 may be determined according to the specific shape and size of the electrode assembly 140. The material of the housing 110 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present invention is not limited thereto.

Among them, the electrode assembly 140 is a component in which electrochemical reactions occur in the secondary battery. One or more electrode assemblies 140 may be contained within the case 110. The electrode assembly 140 is mainly formed by winding or stacking a positive electrode tab (not shown) and a negative electrode tab (not shown), and a separator is generally provided between the positive electrode tab and the negative electrode tab. The portions of the positive and negative electrode sheets having active materials constitute a body 142 of the electrode assembly 140, the portions of the positive and negative electrode sheets having no active materials each constitute a tab 143, and the tabs 143 include positive and negative tabs. The positive electrode tab and the negative electrode tab can be located at one end of the body 142 or at two ends of the body 142 respectively, and in this embodiment, the positive electrode tab and the negative electrode tab are located at two opposite ends of the body 142 in the length direction X. In the charge and discharge processes of the secondary battery, the positive and negative active materials react with the electrolyte filled in the accommodating cavity of the case 110, and the tabs are connected to the electrode terminals to form a current loop.

In the process of charging and discharging the secondary battery, the positive active material and the negative active material in the electrode assembly 140 react with the electrolyte to slowly generate gas, and when the internal air pressure of the casing 110 of the secondary battery 100 reaches a certain degree, the explosion-proof valve 122 on the top cover part 121 is opened, and the gas is sprayed out from the explosion-proof valve 122, however, in the conventional secondary battery, in the process of discharging the gas generated by the electrode assembly 140 to the explosion-proof valve 122 in the working process of the secondary battery, because of the existence of the insulating member 130, the upper side surface of the electrode assembly group contacts with the insulating member 130, and the insulating member 130 obstructs the discharge of the gas, so that the gas cannot be smoothly discharged to the region where the explosion-proof valve 122 is located, and the service life of the secondary battery is affected.

In this embodiment, referring to fig. 3, as shown by the arrow, after the gas generated by the electrode assembly 140 is exhausted through the end face 141, the gas rises to the insulating member 130 along the height direction Z, and due to the existence of the exhaust passage 132, the gas can be exhausted to the region where the explosion-proof valve 122 is located through the exhaust passage 132 and then exhausted through the explosion-proof valve 122, so that the gas generated during the operation of the electrode assembly 140 can be smoothly exhausted to the region where the explosion-proof valve 122 is located, thereby ensuring the safe use of the secondary battery 100 and prolonging the service life of the electrode assembly 140.

Further, referring to fig. 3, 4 and 7, the secondary battery 100 further includes a frame 150. The frame 150 is disposed between the end face 141 of the electrode assembly 140 and the case 110, and the frame 150 has an auxiliary passage communicating with the exhaust passage 132 along the height direction Z of the case 110.

Specifically, referring to fig. 7, the frame body 150 includes a first support frame 151, a second support frame 152, and a connecting member 153, the first support frame 151 and the second support frame 152 are oppositely disposed along the length direction X of the housing 110, and the opposite surfaces of the first support frame 151 and the second support frame 152 are connected by the connecting member 153 to constitute the frame body 150. In this embodiment, the first support frame 151 and the second support frame 152 are both square frames, the first support frame 151 is connected to the second support frame 152 through a connection member 153 to define an exhaust chamber 154 between the first support frame 151 and the second support frame 152, the first support frame 151 is opposite to the end surface 141, the tab 143 of the electrode assembly 140 protrudes into the frame 150 through the first support frame 151, and the end surface 141 is communicated with the exhaust chamber 154 through the first support frame 151. In addition, referring to fig. 7, the connecting member 153 has a first end face 1531 and a second end face 1532 opposite to each other in the height direction Z, the first end face 1531 has a first air vent 155, the first end face 1531 contacts with the protrusion 131, the first air vent 155 communicates with the air exhaust cavity 154 to form an auxiliary channel, that is, the air generated by the end face 141 of the electrode assembly 140 is exhausted to the air exhaust channel 132 through the auxiliary channel formed by the first supporting frame 151, the air exhaust cavity 154 and the first air vent 155. Referring to fig. 7, the second end face 1532 of the connecting member 153 is provided with a second air port (not shown) communicating with the air exhaust cavity 154, the connecting member 153 further has a third end face 1533 and a fourth end face 1534 oppositely arranged along the width direction Y of the housing 110, the third end face 1533 and the fourth end face 1534 are respectively provided with a third air port 156 communicating with the air exhaust cavity 154, and the second air port and the third air port 156 are opened so that the air exhausted from the end face 141 of each electrode assembly 140 can be exhausted to the air exhaust channel 132 through the frame 150. In addition, referring to fig. 3, 4 and 8, the cap assembly 120 further includes a pin 123, the pin 123 is disposed in the case 110, the pin 123 includes a connection part 1231 and a lead-out part 1232, the lead-out part 1232 is led out from the connection part 1231 and extends between the frame 150 and the case 110 along the height direction Z of the case 110, the lead-out part 1232 is electrically connected to the electrode assembly 140, specifically, the lead-out part 1232 is electrically connected to the tab 143 of the electrode assembly 140, due to the presence of the frame 150, the lead-out part 1232 of the pin 123 is electrically connected to only the tab 143, the lead-out part 1232 does not contact with the end surface 141 of the electrode assembly 140, the distance between the pin 123 and the end surface 141 is ensured, and thus, the gas generated during the operation of the electrode assembly 140 is smoothly discharged to the exhaust passage 132 through the auxiliary passage.

In addition, referring to fig. 8, the lead 123 further includes overlapping portions 1233, the number of the overlapping portions 1233 is two, and the overlapping portions 1233 are arranged at intervals in the height direction Z of the case 110, the two overlapping portions 1233 are respectively connected to the lead portions 1232, the lead portions 1232 are electrically connected to the tabs 143 of the electrode assembly 140 through the overlapping portions 1233, and the overlapping portions 1233 and the connection portions 1231 are arranged at intervals in the height direction Z of the case 110, so that the gas discharged to the end surface 141 of the electrode assembly 140 is smoothly discharged to the gas discharge passage 132.

Referring to fig. 3 and 4, in the present embodiment, the number of the electrode assemblies 140 is four, and the electrode assemblies are stacked from top to bottom along the height direction Z, the second end face 1532 of the frame 150 extends along the height direction Z to an end face of a third electrode assembly 140 (or a second electrode assembly 140 from bottom to top) of the four electrode assemblies 140, that is, the height of the frame 150 in the height direction Z is less than the stacking height of the four electrode assemblies 140 in the height direction Z, a gap is left between the second end face 1532 and the overlapping portion 1233 away from the top cover sheet 121, and gas generated at the end face 141 of the electrode assembly 140 located below the second end face 1532 can enter the exhaust cavity 154 through the second gas port formed on the second end face 1532 and be discharged to the exhaust channel 132. In other implementation manners, the height of the frame 150 may be adjusted according to actual use requirements, for example, the tabs 143 of the four electrode assemblies 140 all extend into the exhaust cavity 154, but the frame 150 only needs to separate the pins 123 from the end surfaces 141, so as to prevent the lead-out portions 1232 and the overlapping portions 1233 of the pins 123 from adhering to the end surfaces 141 to block smooth exhaust of the gas.

Referring to fig. 1 to 4, the top cap assembly 120 further includes a pole 124, the pole 124 penetrates through the top cap 121, the insulating member 130 is provided with a plug hole 134 for the pole 124 to pass through, the plug hole 134 is disposed between the two protruding portions 131, and the pole 124 is electrically connected to the connecting portion 1231 of the pin 123.

Meanwhile, the embodiment of the present application also provides a battery pack including the secondary battery 100 as described above.

The foregoing detailed description is directed to a secondary battery and a battery pack provided in the embodiments of the present application, and the principles and embodiments of the present application are described herein using specific examples, which are merely provided to help understand the method and the core concept of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A secondary battery comprising:

a housing (110) provided with an opening (111), the housing (110) having a longitudinal direction (X) and a height direction (Z) orthogonal to the longitudinal direction (X);

the top cover assembly (120) is arranged on the opening (111) in a covering mode, and the top cover assembly (120) comprises a top cover sheet (121) and an explosion-proof valve (122) arranged on the top cover sheet (121);

it is characterized by also comprising:

the insulating piece (130) is arranged in the shell (110), the insulating piece (130) is overlapped with the top cover sheet (121) along the height direction (Z), one surface, away from the top cover sheet (121), of the insulating piece (130) is provided with at least two protruding parts (131), and the at least two protruding parts (131) form an exhaust channel (132) at intervals; and

at least one electrode assembly (140) disposed in the case (110) along the length direction (X), the electrode assembly (140) having two end faces (141) oppositely disposed along the length direction (X);

wherein gas generated by the electrode assembly (140) is discharged from the end surface (141) and discharged to the explosion-proof valve (122) through the gas discharge passage (132).

2. The secondary battery according to claim 1, wherein the case (110) further has a width direction (Y) orthogonal to the length direction (X), and the at least two protrusions (131) are arranged at intervals in the width direction (Y) to form the exhaust passage (132);

the at least two protrusions (131) are adjacent to the end surface (141) in the length direction (X).

3. The secondary battery according to claim 2, wherein the at least two protrusions (131) constitute one group of protrusion groups (131 a), the number of the protrusion groups (131 a) being at least two groups, arranged on both sides of the explosion-proof valve (122) in the length direction (X).

4. The secondary battery according to claim 2, further comprising a frame (150), wherein the frame (150) is disposed between the end surface (141) and the case (110), and the frame (150) is provided with an auxiliary passage communicating with the air discharge passage (132) along the height direction (Z);

the top cover assembly (120) further comprises a pin (123), and the pin (123) is arranged in the shell (110); the lead (123) includes a connecting portion (1231) and an extraction portion (1232), the extraction portion (1232) is extracted from the connecting portion (1231) and extends between the frame (150) and the case (110) in the height direction (Z), and the extraction portion (1232) is electrically connected to the electrode assembly (140).

5. The secondary battery according to claim 4, wherein the frame body (150) includes a first support frame (151), a second support frame (152), and a connector (153), the first support frame (151) and the second support frame (152) being disposed opposite to each other along the length direction (X), the opposite surfaces of the first support frame (151) and the second support frame (152) being connected by the connector (153) to define an air discharge chamber (154) between the first support frame (151) and the second support frame (152), the end surface (141) being in communication with the air discharge chamber (154) through the first support frame (151);

the connecting piece (153) is provided with a first end face (1531) and a second end face (1532) which are oppositely arranged along the height direction (Z), the first end face (1531) is provided with a first air port (155), and the first air port (155) is communicated with the air exhaust cavity (154) to form the auxiliary channel.

6. The secondary battery of claim 5, wherein the second end face (1532) is provided with a second gas port communicating with the gas discharge chamber (154);

and/or the connecting piece (153) is provided with a third end surface (1533) and a fourth end surface (1534) which are oppositely arranged along the width direction (Y), and at least one of the third end surface (1533) and the fourth end surface (1534) is provided with a third air port (156) communicated with the air exhaust cavity (154).

7. The secondary battery according to claim 4, wherein the electrode assemblies (140) are provided in at least two, and at least two of the electrode assemblies (140) are stacked in the height direction (Z) to form at least one electrode assembly group having upper and lower sides oppositely disposed in the height direction (Z), the upper side being in contact with the protrusion (131).

8. The secondary battery according to claim 5, wherein the first end surface (1531) of the connection member (153) is in contact with the protrusion (131).

9. The secondary battery according to claim 7, wherein the lead pin (123) further comprises at least one overlapping portion (1233), the at least one overlapping portion (1233) is connected to the lead out portion (1232), the at least one overlapping portion (1233) and the connection portion (1231) are arranged at intervals in the height direction (Z), and the lead out portion (1232) is electrically connected to the electrode assembly (140) through the overlapping portion (1233).

10. A battery pack comprising the secondary battery according to any one of claims 1 to 9.

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